{"title":"Builder — Salt","description":null,"products":[{"product_id":"red-sea-salt-20kg-refill-box-600ltr","title":"Red Sea Salt 20kg Refill Box 600ltr","description":"\u003cp\u003e\u003cstrong\u003eOne 20 kg refill box mixes 600 litres of stable, moderate-alkalinity reef seawater.\u003c\/strong\u003e Red Sea Salt is Red Sea's original marine salt mix, formulated to a natural, reef-stable alkalinity so it suits fish-only systems and reef tanks running on natural or lightly dosed nutrient levels. This refill box is the format for topping up a bucket you already own, rather than paying for a new bucket each time.\u003c\/p\u003e\u003ch3\u003eKey features\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMakes 600 litres\u003c\/strong\u003e — one 20 kg box mixed to reef salinity (35 ppt), roughly twelve 50 L water changes.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eModerate, reef-stable alkalinity\u003c\/strong\u003e — 7.7–8.1 dKH at 35 ppt, closer to natural seawater than the elevated alkalinity of Coral Pro Salt.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDissolves fast and clean\u003c\/strong\u003e, with no cloudy residue left once fully circulated.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRefill box format\u003c\/strong\u003e — less packaging than a bucket, and no empty bucket to store afterwards.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003ePack weight\u003c\/th\u003e\n\u003ctd\u003e20 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMakes\u003c\/th\u003e\n\u003ctd\u003e600 L at reef salinity (35 ppt)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAlkalinity at 35 ppt\u003c\/th\u003e\n\u003ctd\u003e7.7–8.1 dKH\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCalcium at 35 ppt\u003c\/th\u003e\n\u003ctd\u003e415–430 mg\/L\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMagnesium at 35 ppt\u003c\/th\u003e\n\u003ctd\u003e1,230–1,290 mg\/L\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePotassium at 35 ppt\u003c\/th\u003e\n\u003ctd\u003e375–395 mg\/L\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFormat\u003c\/th\u003e\n\u003ctd\u003eRefill box — no bucket included\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\u003ch3\u003eWhich pack size do I need?\u003c\/h3\u003e\u003cp\u003eWe stock Red Sea Salt in three pack sizes. Cost per litre doesn't scale with pack size the way you'd expect, so it's worth checking the numbers rather than assuming bigger is cheaper:\u003c\/p\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003ePack\u003c\/th\u003e\n\u003cth\u003eMakes\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e10 kg bag\u003c\/td\u003e\n\u003ctd\u003e300 L\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e25.2 kg bag\u003c\/td\u003e\n\u003ctd\u003e750 L\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e20 kg refill box (this listing)\u003c\/td\u003e\n\u003ctd\u003e600 L\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003cp\u003eThis refill box is priced for topping up a bucket you already own, not for the cheapest litre on the shelf — the 10 kg bag currently costs less per litre. If cost per litre matters most and you don't need the box format, it's worth comparing against the other two sizes first.\u003c\/p\u003e\u003ch3\u003eDosage and directions\u003c\/h3\u003e\u003cp\u003eMix into clean RO or RO\/DI water with circulation until fully dissolved — allow around 20 minutes. Aerate before use, and match temperature and salinity to your display before adding. Use freshly mixed saltwater promptly rather than storing large volumes of made-up mix.\u003c\/p\u003e\u003ch3\u003eSuitable for, and not suitable for\u003c\/h3\u003e\u003cp\u003eSuited to fish-only systems and reef tanks running natural or lightly dosed nutrient levels, where a moderate, stable alkalinity is preferable to an elevated one. Reef tanks with heavy calcium and alkalinity demand from fast SPS growth are usually better matched to Red Sea's Coral Pro Salt, which mixes to a higher starting alkalinity and calcium level.\u003c\/p\u003e\u003ch3\u003eCare and maintenance\u003c\/h3\u003e\u003cp\u003eStore the unmixed salt sealed and dry — moisture reaching the box before mixing throws off the mix ratio. Once mixed, use within a few days rather than holding large volumes of made-up saltwater on hand.\u003c\/p\u003e\u003ch3\u003eWarranty and delivery\u003c\/h3\u003e\u003cp\u003eSold subject to Red Sea's standard product guarantees, which apply in addition to your consumer guarantee rights under Australian Consumer Law. Ships as a standard parcel — no special freight handling required.\u003c\/p\u003e\u003ch3\u003eCommon questions\u003c\/h3\u003e\u003ch4\u003eDoes the refill box come with a bucket?\u003c\/h4\u003e\u003cp\u003eNo. It's designed to be decanted into a bucket or sealed container you already own, which is what keeps the cost per litre lower than buying a new bucket every time.\u003c\/p\u003e\u003ch4\u003eWhat's the difference between this and Red Sea Coral Pro Salt?\u003c\/h4\u003e\u003cp\u003eRed Sea Salt mixes to a moderate alkalinity, around 8 dKH, suited to fish-only tanks and naturally-run reefs. Coral Pro Salt mixes to a higher starting alkalinity and calcium level for reef tanks with heavier coral growth demand.\u003c\/p\u003e\u003ch4\u003eHow far does 600 litres actually go?\u003c\/h4\u003e\u003cp\u003eIt depends on your tank size and water-change routine — as a guide, that's around twelve 50 L water changes, or considerably more if you're only topping up a smaller system.\u003c\/p\u003e\u003ch4\u003eIs this the cheapest way to buy Red Sea Salt per litre?\u003c\/h4\u003e\u003cp\u003eNot necessarily — compare the current cost per litre for each pack size on the product page before deciding. Choose the refill box if you already have a bucket to decant into; choose the 10 kg bag if cost per litre is the deciding factor.\u003c\/p\u003e","brand":"RedSea","offers":[{"title":"Default Title","offer_id":54774151676195,"sku":"RED129","price":164.95,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0972\/7236\/5347\/files\/red-sea-salt-20kg-refill-box-10135198662947-1-dq.webp?v=1790372841"},{"product_id":"red-sea-coral-pro-salt-20kg-refill-box-600ltr","title":"Red Sea Coral Pro Salt 20kg Refill Box 600ltr","description":"\u003cp\u003e\u003cstrong\u003eTwenty kilos of growth-formula salt, minus the bucket you already own.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eRed Sea Coral Pro Salt is the high-alkalinity salt in the Red Sea range, blended to 11.5-12.5 dKH with calcium and magnesium raised to match. This 20 kg refill box mixes 600 litres of seawater at 35 ppt.\u003c\/p\u003e\n\u003cp\u003eIt is the same salt sold in the buckets, packed in a lined cardboard box instead. That saves a plastic pail you do not need - but it means the pack it arrives in is not the pack it should live in.\u003c\/p\u003e\n\n\u003ch3\u003eWhat's in the box\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e20 kg of Red Sea Coral Pro Salt, in a sealed liner inside a cardboard carton\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eNot included\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eNo bucket or storage container.\u003c\/strong\u003e This is a refill. You need an airtight container to decant into, whether that is an empty Red Sea bucket or any food-grade sealable drum\u003c\/li\u003e\n\u003cli\u003eNo measuring scoop - a \u003ca href=\"\/products\/red-sea-salt-measuring-cup\"\u003eRed Sea Salt Measuring Cup\u003c\/a\u003e is sold separately\u003c\/li\u003e\n\u003cli\u003eNo refractometer or hydrometer\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eDecant it the day it arrives.\u003c\/strong\u003e Cardboard and a poly liner are transit packaging, not humidity protection. In a Brisbane summer an opened box will draw enough moisture in a fortnight to set the bottom third solid, and once salt cakes, your dose per scoop is no longer what you think it is.\u003c\/p\u003e\n\n\u003ch3\u003eKey features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e600 litres per box\u003c\/strong\u003e - the same formula and the same mix ratio as the buckets, with no container to store or dispose of.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLess plastic per litre mixed\u003c\/strong\u003e - one bucket, refilled repeatedly, instead of a new pail every time.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCosts more per litre mixed than the 22 kg bucket\u003c\/strong\u003e - despite using less plastic. Buy this size for convenience, not for unit cost.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e11.5-12.5 dKH\u003c\/strong\u003e - carbonate headroom for a reef consuming alkalinity faster than a natural-seawater salt replaces it.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCalcium 450-480 mg\/L, magnesium 1350-1430 mg\/L\u003c\/strong\u003e - raised proportionally so the foundation elements stay in balance with each other.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePotassium 385-415 mg\/L\u003c\/strong\u003e - brackets Red Sea's 400 ppm reef target without separate dosing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlat-pack storage before opening\u003c\/strong\u003e - a sealed box stacks in a cupboard where a bucket will not.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDissolves clear in about 20 minutes\u003c\/strong\u003e - Red Sea's reformulated blend.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhich pack size do I need?\u003c\/h3\u003e\n\u003cp\u003eAll three packs are chemically identical. The decision is about what you already have on the shelf.\u003c\/p\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003ePack\u003c\/th\u003e\n\u003cth\u003eMakes\u003c\/th\u003e\n\u003cth\u003eBest for\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003e7 kg bucket\u003c\/th\u003e\n\u003ctd\u003e210 litres\u003c\/td\u003e\n\u003ctd\u003eSystems under about 300 L, or trialling the formula\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003e20 kg refill box\u003c\/th\u003e\n\u003ctd\u003e600 litres\u003c\/td\u003e\n\u003ctd\u003eReefers who already own an airtight bucket to decant into\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003e22 kg bucket\u003c\/th\u003e\n\u003ctd\u003e660 litres\u003c\/td\u003e\n\u003ctd\u003eBulk volume where you want the sealed container included\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003cp\u003eIf this is your first Coral Pro purchase, buy a bucket. The refill box is the second purchase onward. Per litre, the 22 kg bucket is the cheapest of the three, this 20 kg refill box costs a little more, and the 7 kg bucket the most.\u003c\/p\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003ePack size\u003c\/th\u003e\n\u003ctd\u003e20 kg refill box\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMakes\u003c\/th\u003e\n\u003ctd\u003e600 litres at 35 ppt\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMix ratio\u003c\/th\u003e\n\u003ctd\u003e1 kg per 30 litres of RO water (Red Sea pack rating)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eType\u003c\/th\u003e\n\u003ctd\u003eSynthetic high-alkalinity reef salt\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAlkalinity at 35 ppt\u003c\/th\u003e\n\u003ctd\u003e11.5-12.5 dKH (4.15-4.45 meq\/L)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCalcium at 35 ppt\u003c\/th\u003e\n\u003ctd\u003e450-480 mg\/L\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMagnesium at 35 ppt\u003c\/th\u003e\n\u003ctd\u003e1350-1430 mg\/L\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePotassium at 35 ppt\u003c\/th\u003e\n\u003ctd\u003e385-415 mg\/L\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWater type\u003c\/th\u003e\n\u003ctd\u003eSaltwater and reef\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eContainer\u003c\/th\u003e\n\u003ctd\u003eLined cardboard carton - not resealable\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDissolving time\u003c\/th\u003e\n\u003ctd\u003eAbout 20 minutes with circulation\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\n\u003ch3\u003eHow to mix it\u003c\/h3\u003e\n\u003col\u003e\n\u003cli\u003eStart with RO or RO\/DI water at tank temperature, around 25 degrees C.\u003c\/li\u003e\n\u003cli\u003eAdd salt to water with a powerhead already running - never water to salt.\u003c\/li\u003e\n\u003cli\u003eWork to roughly 1 kg per 30 litres, then check and adjust.\u003c\/li\u003e\n\u003cli\u003eCirculate and aerate until completely clear, normally about 20 minutes.\u003c\/li\u003e\n\u003cli\u003eMatch temperature and salinity to the display before the water goes in.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp\u003e\u003cstrong\u003eSet salinity with a refractometer, not with the scoop.\u003c\/strong\u003e The 1 kg per 30 litre figure is Red Sea's pack rating; the exact dose that lands on 35 ppt shifts with your source water and how you measure.\u003c\/p\u003e\n\u003cp\u003eUse mixed saltwater within about 24 hours, because alkalinity drifts down and carbonate precipitates out of water left standing.\u003c\/p\u003e\n\n\u003ch3\u003eSuitable for, and not suitable for\u003c\/h3\u003e\n\u003ch4\u003eSuitable for\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eReefers who already own a sealable salt bucket or food-grade drum\u003c\/li\u003e\n\u003cli\u003eMixed reefs, LPS and soft coral systems in active growth\u003c\/li\u003e\n\u003cli\u003eFrag and grow-out systems doing high-volume water changes\u003c\/li\u003e\n\u003cli\u003eAnyone wanting to cut the number of plastic pails going through the shed\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eNot suitable for\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eA first Coral Pro purchase with nothing to decant into - buy the \u003ca href=\"\/products\/red-sea-coral-pro-sea-salts-22-kg-660-ltr-bucket\"\u003e22 kg bucket\u003c\/a\u003e instead\u003c\/li\u003e\n\u003cli\u003eFreshwater aquariums - this is full synthetic seawater, not a tonic salt\u003c\/li\u003e\n\u003cli\u003eMature SPS reefs held at 7-8 dKH, where 12 dKH salt swings alkalinity too far. \u003ca href=\"\/products\/red-sea-salt-20kg-refill-box-600ltr\"\u003eRed Sea Salt\u003c\/a\u003e at 7.7-8.2 dKH suits those systems\u003c\/li\u003e\n\u003cli\u003eLong-term storage in the carton it ships in\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eCare and storage\u003c\/h3\u003e\n\u003cp\u003eTransfer the full contents into an airtight container as soon as it arrives, and keep that container off bare concrete. Concrete wicks moisture upward and is the usual reason a part-used salt supply cakes.\u003c\/p\u003e\n\u003cp\u003eCaked salt is not spoiled, but compacted salt weighs more per scoop than loose salt. If it has set, break it up and weigh your dose rather than measuring by volume.\u003c\/p\u003e\n\n\u003ch3\u003eGoes well with\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/red-sea-seawater-refractometer\"\u003eRed Sea Seawater Refractometer\u003c\/a\u003e - the instrument that sets your real salinity.\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/red-sea-salt-measuring-cup\"\u003eRed Sea Salt Measuring Cup\u003c\/a\u003e - repeatable scoops between mixes.\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/red-sea-reef-foundation-pro-multi-testing-kit\"\u003eRed Sea Reef Foundation Pro Multi Test Kit\u003c\/a\u003e - confirms the calcium, alkalinity and magnesium your mixed water actually reached.\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/red-sea-coral-pro-sea-salts-7-kg-210-ltr-bucket\"\u003eCoral Pro Salt 7 kg bucket\u003c\/a\u003e - a smaller sealed option for smaller systems.\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/red-sea-coral-colors-pro-test-kit\"\u003eRed Sea Coral Colours Pro Test Kit\u003c\/a\u003e - for the iodine, potassium and iron water changes will not hold on their own.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWarranty and delivery\u003c\/h3\u003e\n\u003cp\u003eSalt is a consumable and carries no service warranty, but the consumer guarantees under Australian Consumer Law apply. A box arriving split, wet or contaminated is replaced.\u003c\/p\u003e\n\u003cp\u003eAt 20 kg this is a heavy freight item. Cardboard travels less well than a bucket, so inspect the carton before signing for it and report any crushing or water damage rather than decanting damp salt.\u003c\/p\u003e\n\n\u003ch3\u003eCommon questions\u003c\/h3\u003e\n\u003ch4\u003eDoes the Red Sea Coral Pro Salt refill box come with a bucket?\u003c\/h4\u003e\n\u003cp\u003eNo. The 20 kg refill box contains salt only, in a lined cardboard carton, and you supply your own airtight container. It is designed to refill a Red Sea bucket you already own.\u003c\/p\u003e\n\u003ch4\u003eHow many litres does the 20 kg refill box make?\u003c\/h4\u003e\n\u003cp\u003eThe 20 kg refill box makes 600 litres of seawater at 35 ppt, matching Red Sea's pack rating of 1 kg per 30 litres. Confirm the final salinity with a refractometer, since exact dose varies with source water.\u003c\/p\u003e\n\u003ch4\u003eCan I store the salt in the box it comes in?\u003c\/h4\u003e\n\u003cp\u003eOnly briefly. Cardboard and a poly liner do not seal against humidity, and in a subtropical climate an opened box can cake within a couple of weeks, so decant into an airtight container on arrival.\u003c\/p\u003e\n\u003ch4\u003eIs the refill box the same salt as the bucket?\u003c\/h4\u003e\n\u003cp\u003eYes - the 20 kg refill box, the 7 kg bucket and the 22 kg bucket are the identical Coral Pro formula with the same mix ratio. Only the packaging and the quantity differ.\u003c\/p\u003e\n\u003ch4\u003eWill this salt raise my tank's alkalinity?\u003c\/h4\u003e\n\u003cp\u003eOn a system currently sitting at 7-8 dKH, repeated changes with 12 dKH salt will pull the tank upward over time. That is intentional on a reef building skeleton, but move it gradually rather than in one large change.\u003c\/p\u003e","brand":"RedSea","offers":[{"title":"Default Title","offer_id":54774151807267,"sku":"RED178","price":187.95,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0972\/7236\/5347\/files\/red-sea-coral-pro-salt-20kg--10135198695715-1-dq.webp?v=1790372841"},{"product_id":"red-sea-salt-25-2kg-bag-750l","title":"Red Sea Salt 25.2kg bag (750L)","description":"\u003cp\u003e\u003cstrong\u003eOne 25.2 kg bag mixes 750 litres of moderate-alkalinity reef seawater.\u003c\/strong\u003e Red Sea Salt is Red Sea's original marine salt mix, formulated to a natural, reef-stable alkalinity that suits fish-only systems and reef tanks run without heavy supplementation. This is the largest of the three Red Sea Salt pack sizes we stock.\u003c\/p\u003e\u003ch3\u003eKey features\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMakes 750 litres\u003c\/strong\u003e — one 25.2 kg bag mixed to reef salinity (35 ppt), roughly fifteen 50 L water changes.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eModerate, reef-stable alkalinity\u003c\/strong\u003e — 7.7–8.1 dKH at 35 ppt, closer to natural seawater than the elevated alkalinity of Coral Pro Salt.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDissolves fast and clean\u003c\/strong\u003e, with no cloudy residue once fully circulated.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOne bag, fewer deliveries\u003c\/strong\u003e — suited to larger systems or shop tanks doing frequent water changes.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003ePack weight\u003c\/th\u003e\n\u003ctd\u003e25.2 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMakes\u003c\/th\u003e\n\u003ctd\u003e750 L at reef salinity (35 ppt)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAlkalinity at 35 ppt\u003c\/th\u003e\n\u003ctd\u003e7.7–8.1 dKH\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCalcium at 35 ppt\u003c\/th\u003e\n\u003ctd\u003e415–430 mg\/L\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMagnesium at 35 ppt\u003c\/th\u003e\n\u003ctd\u003e1,230–1,290 mg\/L\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePotassium at 35 ppt\u003c\/th\u003e\n\u003ctd\u003e375–395 mg\/L\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFormat\u003c\/th\u003e\n\u003ctd\u003eBag — decant into a sealed container\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\u003ch3\u003eWhich pack size do I need?\u003c\/h3\u003e\u003cp\u003eWe stock Red Sea Salt in three pack sizes. Cost per litre doesn't scale with pack size the way you'd expect, so it's worth checking the numbers rather than assuming bigger is cheaper:\u003c\/p\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003ePack\u003c\/th\u003e\n\u003cth\u003eMakes\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e10 kg bag\u003c\/td\u003e\n\u003ctd\u003e300 L\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e25.2 kg bag (this listing)\u003c\/td\u003e\n\u003ctd\u003e750 L\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e20 kg refill box\u003c\/td\u003e\n\u003ctd\u003e600 L\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003cp\u003eAt 750 L per bag, this size suits larger systems and shops that want fewer, bigger deliveries rather than the lowest cost per litre — the 10 kg bag is cheaper litre for litre, but means buying more often.\u003c\/p\u003e\u003ch3\u003eDosage and directions\u003c\/h3\u003e\u003cp\u003eMix into clean RO or RO\/DI water with circulation until fully dissolved — allow around 20 minutes. Aerate before use, and match temperature and salinity to your display before adding. Mix in batches rather than all at once if your container can't hold the full 750 L.\u003c\/p\u003e\u003ch3\u003eSuitable for, and not suitable for\u003c\/h3\u003e\u003cp\u003eSuited to fish-only systems and reef tanks running natural or lightly dosed nutrient levels, and to larger displays or shop systems where buying in bulk cuts down on repeat orders. Reef tanks with heavy calcium and alkalinity demand from fast SPS growth are usually better matched to Red Sea's Coral Pro Salt, which mixes to a higher starting alkalinity and calcium level.\u003c\/p\u003e\u003ch3\u003eCare and maintenance\u003c\/h3\u003e\u003cp\u003eStore sealed and dry, off the floor. Reseal the bag firmly between uses — moisture reaching the unmixed salt changes the effective mix ratio for later batches.\u003c\/p\u003e\u003ch3\u003eWarranty and delivery\u003c\/h3\u003e\u003cp\u003eSold subject to Red Sea's standard product guarantees, which apply in addition to your consumer guarantee rights under Australian Consumer Law. Ships as a single carton — no special freight handling required.\u003c\/p\u003e\u003ch3\u003eCommon questions\u003c\/h3\u003e\u003ch4\u003eIs the 25.2 kg bag better value than the smaller bag?\u003c\/h4\u003e\u003cp\u003eLitre for litre, no — compare the current cost per litre for each pack size on the product page before deciding. This size is aimed at larger systems and shops wanting fewer, bigger deliveries rather than the lowest cost per litre.\u003c\/p\u003e\u003ch4\u003eDoes the bag include a measuring scoop?\u003c\/h4\u003e\u003cp\u003eNo — pair it with our Red Sea Salt Measuring Cup for consistent, repeatable dosing.\u003c\/p\u003e\u003ch4\u003eWhat's the difference between this and Coral Pro Salt?\u003c\/h4\u003e\u003cp\u003eRed Sea Salt mixes to a moderate alkalinity, around 8 dKH, suited to fish-only tanks and naturally-run reefs. Coral Pro Salt mixes to a higher starting alkalinity and calcium level for reef tanks with heavier coral growth demand.\u003c\/p\u003e\u003ch4\u003eHow is a 25.2 kg bag best stored?\u003c\/h4\u003e\u003cp\u003eSealed and dry, off the floor. Once opened, reseal firmly between uses.\u003c\/p\u003e","brand":"RedSea","offers":[{"title":"Default Title","offer_id":55242287382819,"sku":"AA2299","price":179.0,"currency_code":"AUD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0972\/7236\/5347\/files\/red-sea-salt-25-2kg-bag-750l-43106873475363.webp?v=1790233226"},{"product_id":"red-sea-coral-pro-sea-salts-22-kg-660-ltr-bucket","title":"Red Sea Coral Pro Sea Salts - 22 kg (660 Ltr) Bucket","description":"\u003cp\u003e\u003cstrong\u003eSix hundred and sixty litres of growth-formula seawater, in one sealed bucket.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eRed Sea Coral Pro Salt is the high-alkalinity salt in the Red Sea range, blended to 11.5-12.5 dKH with calcium and magnesium lifted to match. The 22 kg bucket mixes 660 litres at 35 ppt.\u003c\/p\u003e\n\u003cp\u003eThis is the size for a reef doing real volume - a 500 litre system on weekly 10% changes gets roughly thirteen changes from one bucket. Buy it when you have stopped thinking about salt in single water changes and started thinking in months.\u003c\/p\u003e\n\n\u003ch3\u003eKey features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e660 litres from one purchase\u003c\/strong\u003e - about three months of weekly 10% changes on a 500 litre system, so you reorder four times a year instead of monthly.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eScrew-top resealable bucket\u003c\/strong\u003e - the format that survives a Queensland summer. Salt draws moisture from humid air, and an airtight bucket is the difference between a scoopable last third and a solid block.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e11.5-12.5 dKH\u003c\/strong\u003e - carbonate headroom for a reef consuming alkalinity faster than a natural-seawater salt replaces it.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCalcium 450-480 mg\/L, magnesium 1350-1430 mg\/L\u003c\/strong\u003e - lifted proportionally, so no single foundation element runs ahead of the other two.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePotassium 385-415 mg\/L\u003c\/strong\u003e - straddles Red Sea's 400 ppm reef target without separate dosing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDissolves clear in about 20 minutes\u003c\/strong\u003e - the reformulated blend, which matters when you are mixing 50 litres at a time.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReusable bucket\u003c\/strong\u003e - most reefers end up using the empty as a mixing or change bucket.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e$0.27 per litre mixed\u003c\/strong\u003e - the lowest cost per litre in the Coral Pro range, cheaper than both the 7 kg bucket and the 20 kg refill box at current pricing.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhich pack size do I need?\u003c\/h3\u003e\n\u003cp\u003eAll three packs are the identical formula. The choice is storage and turnover, not chemistry.\u003c\/p\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003ePack\u003c\/th\u003e\n\u003cth\u003eMakes\u003c\/th\u003e\n\u003cth\u003eCost per litre\u003c\/th\u003e\n\u003cth\u003eBest for\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003e7 kg bucket\u003c\/th\u003e\n\u003ctd\u003e210 litres\u003c\/td\u003e\n\u003ctd\u003e$0.32 per litre\u003c\/td\u003e\n\u003ctd\u003eSystems under about 300 L, or trialling the formula\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003e20 kg refill box\u003c\/th\u003e\n\u003ctd\u003e600 litres\u003c\/td\u003e\n\u003ctd\u003e$0.31 per litre\u003c\/td\u003e\n\u003ctd\u003eDecanting into a bucket you already own; less plastic per litre\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003e22 kg bucket\u003c\/th\u003e\n\u003ctd\u003e660 litres\u003c\/td\u003e\n\u003ctd\u003e$0.27 per litre\u003c\/td\u003e\n\u003ctd\u003eLarger reefs wanting bulk volume in a sealed, reusable container\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003cp\u003eBuy the pack you will finish within roughly three months of opening. Beyond that, humidity starts to win.\u003c\/p\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003ePack size\u003c\/th\u003e\n\u003ctd\u003e22 kg bucket\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMakes\u003c\/th\u003e\n\u003ctd\u003e660 litres at 35 ppt\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMix ratio\u003c\/th\u003e\n\u003ctd\u003e1 kg per 30 litres of RO water (Red Sea pack rating)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eType\u003c\/th\u003e\n\u003ctd\u003eSynthetic high-alkalinity reef salt\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAlkalinity at 35 ppt\u003c\/th\u003e\n\u003ctd\u003e11.5-12.5 dKH (4.15-4.45 meq\/L)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCalcium at 35 ppt\u003c\/th\u003e\n\u003ctd\u003e450-480 mg\/L\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMagnesium at 35 ppt\u003c\/th\u003e\n\u003ctd\u003e1350-1430 mg\/L\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePotassium at 35 ppt\u003c\/th\u003e\n\u003ctd\u003e385-415 mg\/L\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWater type\u003c\/th\u003e\n\u003ctd\u003eSaltwater and reef\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eContainer\u003c\/th\u003e\n\u003ctd\u003eResealable screw-top bucket\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDissolving time\u003c\/th\u003e\n\u003ctd\u003eAbout 20 minutes with circulation\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\n\u003ch3\u003eHow long will 660 litres last?\u003c\/h3\u003e\n\u003cp\u003eWater change volume is what determines this, not tank size on its own. The figures below assume a 10% weekly change.\u003c\/p\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eSystem volume\u003c\/th\u003e\n\u003cth\u003eWeekly change\u003c\/th\u003e\n\u003cth\u003eOne 22 kg bucket lasts\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003e200 litres\u003c\/th\u003e\n\u003ctd\u003e20 litres\u003c\/td\u003e\n\u003ctd\u003eAbout 33 weeks\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003e400 litres\u003c\/th\u003e\n\u003ctd\u003e40 litres\u003c\/td\u003e\n\u003ctd\u003eAbout 16 weeks\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003e500 litres\u003c\/th\u003e\n\u003ctd\u003e50 litres\u003c\/td\u003e\n\u003ctd\u003eAbout 13 weeks\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003e800 litres\u003c\/th\u003e\n\u003ctd\u003e80 litres\u003c\/td\u003e\n\u003ctd\u003eAbout 8 weeks\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003cp\u003eOn systems under about 200 litres, a bucket this size will still be open in nine months. The 7 kg bucket is the better buy there, even though the litre-for-litre maths says otherwise.\u003c\/p\u003e\n\n\u003ch3\u003eHow to mix it\u003c\/h3\u003e\n\u003col\u003e\n\u003cli\u003eStart with RO or RO\/DI water at tank temperature, around 25 degrees C.\u003c\/li\u003e\n\u003cli\u003eAdd salt to water with a powerhead already running - never water to salt.\u003c\/li\u003e\n\u003cli\u003eWork to roughly 1 kg per 30 litres, then check and adjust.\u003c\/li\u003e\n\u003cli\u003eCirculate and aerate until completely clear, normally about 20 minutes.\u003c\/li\u003e\n\u003cli\u003eMatch temperature and salinity to the display before use.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp\u003e\u003cstrong\u003eSet the final salinity with a refractometer, not with the scoop.\u003c\/strong\u003e The 1 kg per 30 litre rating is Red Sea's pack figure; the precise dose that lands on 35 ppt shifts with source water and measuring method.\u003c\/p\u003e\n\u003cp\u003eMixed saltwater is best used within about 24 hours. Standing longer, alkalinity drifts down and carbonate precipitates onto the bottom of the drum.\u003c\/p\u003e\n\n\u003ch3\u003eSuitable for, and not suitable for\u003c\/h3\u003e\n\u003ch4\u003eSuitable for\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eLarger mixed reefs, LPS and soft coral systems in active growth\u003c\/li\u003e\n\u003cli\u003eFrag and coral grow-out systems doing high-volume changes\u003c\/li\u003e\n\u003cli\u003eReefers holding foundation levels by water change rather than by dosing\u003c\/li\u003e\n\u003cli\u003eAnyone mixing 40 litres or more at a time\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eNot suitable for\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eFreshwater aquariums - this is full synthetic seawater, not a tonic or aquarium salt\u003c\/li\u003e\n\u003cli\u003eMature SPS reefs held at 7-8 dKH, where a 12 dKH change swings alkalinity enough to burn tips. \u003ca href=\"\/products\/red-sea-salt-20kg-refill-box-600ltr\"\u003eRed Sea Salt\u003c\/a\u003e at 7.7-8.2 dKH matches those systems\u003c\/li\u003e\n\u003cli\u003eNano and small systems - 660 litres will outlast its own shelf life in the bucket\u003c\/li\u003e\n\u003cli\u003eEvaporation top-up, which always uses fresh RO water only\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eCare and storage\u003c\/h3\u003e\n\u003cp\u003eSeal the lid fully after every scoop and keep the bucket off a bare concrete floor. Concrete wicks moisture, and this is the single most common reason a part-used bucket sets solid.\u003c\/p\u003e\n\u003cp\u003eClumped salt has not gone off, but the mass per scoop changes, so weigh it instead of measuring by volume. Break up any lumps before they go into the mixing drum.\u003c\/p\u003e\n\n\u003ch3\u003eGoes well with\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/red-sea-seawater-refractometer\"\u003eRed Sea Seawater Refractometer\u003c\/a\u003e - the instrument that actually sets your salinity.\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/red-sea-reef-foundation-pro-multi-testing-kit\"\u003eRed Sea Reef Foundation Pro Multi Test Kit\u003c\/a\u003e - verifies the calcium, alkalinity and magnesium your mixed water landed on.\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/red-sea-coral-pro-salt-20kg-refill-box-600ltr\"\u003eCoral Pro Salt 20 kg refill box\u003c\/a\u003e - refills this bucket once it is empty.\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/red-sea-coral-pro-sea-salts-7-kg-210-ltr-bucket\"\u003eCoral Pro Salt 7 kg bucket\u003c\/a\u003e - the size that suits a smaller system.\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/red-sea-coral-colors-pro-test-kit\"\u003eRed Sea Coral Colours Pro Test Kit\u003c\/a\u003e - covers the iodine, potassium and iron that water changes alone will not hold steady.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWarranty and delivery\u003c\/h3\u003e\n\u003cp\u003eSalt is a consumable and carries no service warranty, but the consumer guarantees under Australian Consumer Law apply. A bucket that arrives split, contaminated or that will not dissolve is replaced.\u003c\/p\u003e\n\u003cp\u003eAt 22 kg this is a heavy freight item, so expect it to be handled separately from a small parcel order. Check the lid seal and the bucket wall on arrival before you open it.\u003c\/p\u003e\n\n\u003ch3\u003eCommon questions\u003c\/h3\u003e\n\u003ch4\u003eHow many litres does a 22 kg bucket of Coral Pro Salt make?\u003c\/h4\u003e\n\u003cp\u003eA 22 kg bucket of Red Sea Coral Pro Salt makes 660 litres of seawater at 35 ppt, which is Red Sea's pack rating of 1 kg per 30 litres. Set the final salinity with a refractometer, since the exact dose to reach 35 ppt varies with source water.\u003c\/p\u003e\n\u003ch4\u003eIs the 22 kg bucket better value than the 20 kg refill box?\u003c\/h4\u003e\n\u003cp\u003eYes, on cost per litre. At current pricing the 22 kg bucket works out to $0.27 per litre, against $0.31 per litre for the 20 kg refill box - a case where the box, despite using less plastic, is not the cheaper buy. The bucket also gives you an airtight, reusable container, which the box does not.\u003c\/p\u003e\n\u003ch4\u003eMy bucket has set solid - is the salt still usable?\u003c\/h4\u003e\n\u003cp\u003eClumped salt is still chemically sound; it has absorbed atmospheric moisture, not degraded. Break the lumps up and weigh your dose rather than scooping by volume, because compacted salt is denser per scoop than loose salt.\u003c\/p\u003e\n\u003ch4\u003eCan I mix a full bucket of saltwater and store it?\u003c\/h4\u003e\n\u003cp\u003eStoring mixed saltwater beyond about 24 hours lets alkalinity drift down and carbonate precipitate out, so the water you use is not the water you mixed. Store the salt dry and mix each batch as you need it.\u003c\/p\u003e\n\u003ch4\u003eWill Coral Pro Salt raise the alkalinity in my tank?\u003c\/h4\u003e\n\u003cp\u003eOn a system currently sitting at 7-8 dKH, changing water with 12 dKH salt will pull the tank upward over successive changes. That is the intent on a growing reef, but it should be approached gradually rather than with one large change.\u003c\/p\u003e","brand":"RedSea","offers":[{"title":"Default Title","offer_id":55242298097955,"sku":"BA0352","price":179.95,"currency_code":"AUD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0972\/7236\/5347\/files\/red-sea-coral-pro-sea-salts-43876738957603.webp?v=1790239781"},{"product_id":"red-sea-salts-22kg-bucket-600-ltrs","title":"Red Sea Salts - 22kg bucket (600 ltrs)","description":"\u003cp\u003e\u003cstrong\u003eA full season's worth of water changes in one bucket.\u003c\/strong\u003e Red Sea Salt is a premium reef-grade marine salt mix that dissolves fast and clean to a balanced calcium, alkalinity and magnesium profile. This 22 kg bucket is Red Sea's largest pack size — mixing to around 575 L at full reef salinity, or further again for a fish-only system — sized for an established tank doing regular water changes rather than a single top-up.\u003c\/p\u003e\u003ch3\u003eKey features\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOne salt, three targets\u003c\/strong\u003e — the same formula mixes to a lighter fish-only salinity, a mid invertebrate salinity, or full reef salinity, just by changing how much you dose. See the mix ratio table below.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eResealable bucket\u003c\/strong\u003e — keeps the remaining salt dry between water changes, unlike a torn-open bag.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFree of nitrate and phosphate\u003c\/strong\u003e — won't feed algae or push a reef tank off balance.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eMix ratio and resulting parameters\u003c\/h3\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eSystem type\u003c\/th\u003e\n\u003cth\u003eDose\u003c\/th\u003e\n\u003cth\u003eSalinity\u003c\/th\u003e\n\u003cth\u003eCalcium\u003c\/th\u003e\n\u003cth\u003eAlkalinity\u003c\/th\u003e\n\u003cth\u003eMagnesium\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eFish-only\u003c\/td\u003e\n\u003ctd\u003e33.4 g\/L\u003c\/td\u003e\n\u003ctd\u003e31.0 ppt\u003c\/td\u003e\n\u003ctd\u003e365–395 mg\/L\u003c\/td\u003e\n\u003ctd\u003e6.8–7.3 dKH\u003c\/td\u003e\n\u003ctd\u003e1,100–1,180 mg\/L\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNon-coral invertebrates\u003c\/td\u003e\n\u003ctd\u003e36.0 g\/L\u003c\/td\u003e\n\u003ctd\u003e33.5 ppt\u003c\/td\u003e\n\u003ctd\u003e390–420 mg\/L\u003c\/td\u003e\n\u003ctd\u003e7.3–7.8 dKH\u003c\/td\u003e\n\u003ctd\u003e1,170–1,230 mg\/L\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCoral and reef\u003c\/td\u003e\n\u003ctd\u003e38.2 g\/L\u003c\/td\u003e\n\u003ctd\u003e35.0–35.5 ppt\u003c\/td\u003e\n\u003ctd\u003e415–445 mg\/L\u003c\/td\u003e\n\u003ctd\u003e7.7–8.2 dKH\u003c\/td\u003e\n\u003ctd\u003e1,240–1,320 mg\/L\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003cp\u003eAdd salt to water, not water to salt. Mix vigorously without aeration for 30 minutes to 2 hours until the pH settles at 8.2–8.5, then bring the mix to tank temperature and check salinity with a refractometer before use.\u003c\/p\u003e\u003ch3\u003eWhich pack size is cheapest per litre?\u003c\/h3\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003ePack\u003c\/th\u003e\n\u003cth\u003eLitres at reef salinity\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e2 kg bag\u003c\/td\u003e\n\u003ctd\u003e~52 L\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e4 kg bag\u003c\/td\u003e\n\u003ctd\u003e~104 L\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e22 kg bucket\u003c\/td\u003e\n\u003ctd\u003e~575 L\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003cp\u003eThe 4 kg bag is marginally cheaper per litre than this bucket at current pricing. The bucket's real advantage is fewer bag changes and resealable storage for a tank you're maintaining long-term, not the absolute lowest cost per litre.\u003c\/p\u003e\u003ch3\u003eSuitable for, and not suitable for\u003c\/h3\u003e\u003cp\u003eSuitable for fish-only, invertebrate and coral\/reef marine systems doing regular water changes — the bucket format is built for repeated use, not a one-off. Not the most economical option gram for gram at current pricing; if cost per litre is the deciding factor, compare against the 4 kg bag above before buying the bucket purely for the bulk size.\u003c\/p\u003e\u003ch3\u003eCare and maintenance\u003c\/h3\u003e\u003cp\u003eKeep the lid sealed between uses — a damp storage area or a lid left off will clump the salt before you get to use it all. Mix in a clean, dedicated bucket and let the water reach tank temperature before dosing.\u003c\/p\u003e\u003ch3\u003eWarranty and delivery\u003c\/h3\u003e\u003cp\u003eSold as a consumable, not a warranted item beyond your consumer guarantee rights under Australian Consumer Law — if a bucket arrives damaged or short-filled, contact us for a replacement.\u003c\/p\u003e\u003ch3\u003eCommon questions\u003c\/h3\u003e\u003ch4\u003eHow much water does the 22 kg bucket actually make?\u003c\/h4\u003e\u003cp\u003eAround 575 L mixed to full reef salinity (38.2 g\/L). Mixed lighter, for a fish-only tank at 33.4 g\/L, it stretches further — up to around 660 L, which is the figure Red Sea publishes for this pack size.\u003c\/p\u003e\u003ch4\u003eIs the 22 kg bucket the best value option?\u003c\/h4\u003e\u003cp\u003eNot quite, at current pricing — the 4 kg bag works out slightly cheaper per litre. The bucket's advantage is fewer bag changes and resealable storage, not the lowest cost per litre.\u003c\/p\u003e\u003ch4\u003eIs this the same formula as the 2 kg and 4 kg packs?\u003c\/h4\u003e\u003cp\u003eYes — identical salt, just a bigger pack size.\u003c\/p\u003e\u003ch4\u003eCan I store opened salt in the bucket itself?\u003c\/h4\u003e\u003cp\u003eYes — that's the point of the resealable lid. Keep it somewhere dry rather than a damp shed or garage.\u003c\/p\u003e","brand":"RedSea","offers":[{"title":"Default Title","offer_id":55242298130723,"sku":"BA0346","price":169.95,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0972\/7236\/5347\/files\/red-sea-salts-22kg-bucket-60-46119511720227.webp?v=1790239784"},{"product_id":"red-sea-salts-10-kg-300-ltr-bag","title":"Red Sea Salts - 10 kg (300 Ltr. Bag)","description":"\u003cp\u003e\u003cstrong\u003eOne 10 kg bag mixes 300 litres of moderate-alkalinity reef seawater, at the cheapest cost per litre of our three Red Sea Salt pack sizes.\u003c\/strong\u003e Red Sea Salt is Red Sea's original marine salt mix, formulated to a natural, reef-stable alkalinity that suits fish-only systems and reef tanks run without heavy supplementation. This is the smallest pack size we stock — good for a nano or small display, or for trying the salt before committing to a bigger bag.\u003c\/p\u003e\u003ch3\u003eKey features\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMakes 300 litres\u003c\/strong\u003e — one 10 kg bag mixed to reef salinity (35 ppt), roughly six 50 L water changes.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eModerate, reef-stable alkalinity\u003c\/strong\u003e — 7.7–8.1 dKH at 35 ppt, closer to natural seawater than the elevated alkalinity of Coral Pro Salt.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDissolves fast and clean\u003c\/strong\u003e, with no cloudy residue once fully circulated.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSmall enough to store\u003c\/strong\u003e in a cupboard rather than needing dedicated bucket space.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003ePack weight\u003c\/th\u003e\n\u003ctd\u003e10 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMakes\u003c\/th\u003e\n\u003ctd\u003e300 L at reef salinity (35 ppt)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAlkalinity at 35 ppt\u003c\/th\u003e\n\u003ctd\u003e7.7–8.1 dKH\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCalcium at 35 ppt\u003c\/th\u003e\n\u003ctd\u003e415–430 mg\/L\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMagnesium at 35 ppt\u003c\/th\u003e\n\u003ctd\u003e1,230–1,290 mg\/L\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePotassium at 35 ppt\u003c\/th\u003e\n\u003ctd\u003e375–395 mg\/L\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFormat\u003c\/th\u003e\n\u003ctd\u003eBag — decant into a sealed container\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\u003ch3\u003eWhich pack size do I need?\u003c\/h3\u003e\u003cp\u003eWe stock Red Sea Salt in three pack sizes. Cost per litre doesn't scale with pack size the way you'd expect, so it's worth checking the numbers rather than assuming bigger is cheaper:\u003c\/p\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003ePack\u003c\/th\u003e\n\u003cth\u003eMakes\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e10 kg bag (this listing)\u003c\/td\u003e\n\u003ctd\u003e300 L\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e25.2 kg bag\u003c\/td\u003e\n\u003ctd\u003e750 L\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e20 kg refill box\u003c\/td\u003e\n\u003ctd\u003e600 L\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003cp\u003eThis 10 kg bag is currently the cheapest of the three per litre — a reasonable default if you don't already own a bucket to decant into and don't need the volume of the larger bag.\u003c\/p\u003e\u003ch3\u003eDosage and directions\u003c\/h3\u003e\u003cp\u003eMix into clean RO or RO\/DI water with circulation until fully dissolved — allow around 20 minutes. Aerate before use, and match temperature and salinity to your display before adding. Use freshly mixed saltwater promptly rather than storing it mixed for extended periods.\u003c\/p\u003e\u003ch3\u003eSuitable for, and not suitable for\u003c\/h3\u003e\u003cp\u003eSuited to nano and small-to-medium systems, or as a starter bag before committing to the 25.2 kg bag on a larger tank. Reef tanks with heavy calcium and alkalinity demand from fast SPS growth are usually better matched to Red Sea's Coral Pro Salt, which mixes to a higher starting alkalinity and calcium level.\u003c\/p\u003e\u003ch3\u003eCare and maintenance\u003c\/h3\u003e\u003cp\u003eStore sealed and dry. Once opened, reseal firmly — moisture reaching the unmixed salt changes the effective mix ratio for later batches.\u003c\/p\u003e\u003ch3\u003eWarranty and delivery\u003c\/h3\u003e\u003cp\u003eSold subject to Red Sea's standard product guarantees, which apply in addition to your consumer guarantee rights under Australian Consumer Law. Ships as a standard parcel.\u003c\/p\u003e\u003ch3\u003eCommon questions\u003c\/h3\u003e\u003ch4\u003eWhy is the smallest bag the cheapest per litre?\u003c\/h4\u003e\u003cp\u003ePack pricing doesn't always scale neatly with size — on our shelf right now, this 10 kg bag is priced lower per litre than either the 20 kg refill box or the 25.2 kg bag. Worth checking current pricing across all three before you buy, since this can change.\u003c\/p\u003e\u003ch4\u003eIs 300 litres enough for my tank?\u003c\/h4\u003e\u003cp\u003eFor a nano or small system doing modest water changes, yes. For a larger display or a full water-change routine, the 25.2 kg bag will mean fewer repeat purchases.\u003c\/p\u003e\u003ch4\u003eWhat's the difference between this and Coral Pro Salt?\u003c\/h4\u003e\u003cp\u003eRed Sea Salt mixes to a moderate alkalinity, around 8 dKH, suited to fish-only tanks and naturally-run reefs. Coral Pro Salt mixes to a higher starting alkalinity and calcium level for reef tanks with heavier coral growth demand.\u003c\/p\u003e\u003ch4\u003eDoes this bag come with a scoop?\u003c\/h4\u003e\u003cp\u003eNo — see our Red Sea Salt Measuring Cup for consistent, repeatable dosing.\u003c\/p\u003e","brand":"RedSea","offers":[{"title":"Default Title","offer_id":55242298163491,"sku":"BA0315","price":63.0,"currency_code":"AUD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0972\/7236\/5347\/files\/red-sea-salts-10-kg-300-ltr-43106817900835.webp?v=1790233227"},{"product_id":"red-sea-coral-pro-sea-salts-7-kg-210-ltr-bucket","title":"Red Sea Coral Pro Sea Salts - 7 kg (210 Ltr) Bucket","description":"\u003cp\u003e\u003cstrong\u003eThe growth-formula reef salt, in a size a mid-sized reef gets through.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eRed Sea Coral Pro Salt is the high-alkalinity member of the Red Sea salt range, mixed to 11.5-12.5 dKH with calcium and magnesium raised in step. This 7 kg bucket makes 210 litres of seawater at 35 ppt.\u003c\/p\u003e\n\u003cp\u003eIt suits reefs in an active growth phase, frag systems and newly stocked tanks, where corals pull foundation elements down faster than a standard salt puts them back. On a mature SPS system already held at natural seawater alkalinity, it can be more carbonate than you want.\u003c\/p\u003e\n\n\u003ch3\u003eKey features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e11.5-12.5 dKH straight out of the bucket\u003c\/strong\u003e - enough carbonate headroom that a growing reef does not sag between water changes.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCalcium 450-480 mg\/L, magnesium 1350-1430 mg\/L\u003c\/strong\u003e - raised in step with the alkalinity, so the three foundation elements stay balanced instead of one running ahead.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePotassium 385-415 mg\/L\u003c\/strong\u003e - brackets Red Sea's 400 ppm reef target, so water changes alone hold the level.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMakes 210 litres\u003c\/strong\u003e - the practical size for systems under about 300 litres, where a 22 kg bucket would sit open for months.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eResealable bucket\u003c\/strong\u003e - salt is hygroscopic (it draws moisture from the air), and a sealed lid is what keeps the last scoop mixing like the first.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDissolves clear in about 20 minutes\u003c\/strong\u003e - Red Sea's reformulated blend, so a water change is not an overnight job.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e$0.32 per litre mixed\u003c\/strong\u003e - the highest cost per litre in the Coral Pro range; the premium buys a size that will not sit half-used for months on a smaller system.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhich pack size do I need?\u003c\/h3\u003e\n\u003cp\u003eAll three packs are the same formula. Choose on how fast you get through it, because opened salt takes up moisture and clumps.\u003c\/p\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003ePack\u003c\/th\u003e\n\u003cth\u003eMakes\u003c\/th\u003e\n\u003cth\u003eCost per litre\u003c\/th\u003e\n\u003cth\u003eBest for\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003e7 kg bucket\u003c\/th\u003e\n\u003ctd\u003e210 litres\u003c\/td\u003e\n\u003ctd\u003e$0.32 per litre\u003c\/td\u003e\n\u003ctd\u003eSystems under about 300 L, or a first bucket to trial the formula\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003e20 kg refill box\u003c\/th\u003e\n\u003ctd\u003e600 litres\u003c\/td\u003e\n\u003ctd\u003e$0.31 per litre\u003c\/td\u003e\n\u003ctd\u003eDecanting into a bucket you already own; less plastic per litre mixed\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003e22 kg bucket\u003c\/th\u003e\n\u003ctd\u003e660 litres\u003c\/td\u003e\n\u003ctd\u003e$0.27 per litre\u003c\/td\u003e\n\u003ctd\u003eLarger reefs that want a resealable, moisture-proof container\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003cp\u003eAs a rule, buy the pack you will finish within about three months of opening it.\u003c\/p\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003ePack size\u003c\/th\u003e\n\u003ctd\u003e7 kg bucket\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMakes\u003c\/th\u003e\n\u003ctd\u003e210 litres at 35 ppt\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMix ratio\u003c\/th\u003e\n\u003ctd\u003e1 kg per 30 litres of RO water (Red Sea pack rating)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eType\u003c\/th\u003e\n\u003ctd\u003eSynthetic high-alkalinity reef salt\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAlkalinity at 35 ppt\u003c\/th\u003e\n\u003ctd\u003e11.5-12.5 dKH (4.15-4.45 meq\/L)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCalcium at 35 ppt\u003c\/th\u003e\n\u003ctd\u003e450-480 mg\/L\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMagnesium at 35 ppt\u003c\/th\u003e\n\u003ctd\u003e1350-1430 mg\/L\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePotassium at 35 ppt\u003c\/th\u003e\n\u003ctd\u003e385-415 mg\/L\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWater type\u003c\/th\u003e\n\u003ctd\u003eSaltwater and reef\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDissolving time\u003c\/th\u003e\n\u003ctd\u003eAbout 20 minutes with circulation\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\n\u003ch3\u003eHow to mix it\u003c\/h3\u003e\n\u003col\u003e\n\u003cli\u003eStart with RO or RO\/DI water brought to tank temperature, around 25 degrees C.\u003c\/li\u003e\n\u003cli\u003eAdd salt to water, never water to salt, with a powerhead already running.\u003c\/li\u003e\n\u003cli\u003eAdd roughly 1 kg per 30 litres, then check and adjust.\u003c\/li\u003e\n\u003cli\u003eCirculate and aerate until the water is completely clear - normally about 20 minutes.\u003c\/li\u003e\n\u003cli\u003eMatch temperature and salinity to the display before the water goes in.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp\u003e\u003cstrong\u003eMix to your refractometer, not to the box.\u003c\/strong\u003e The 1 kg per 30 litre figure is Red Sea's pack rating; the exact dose that lands on 35 ppt varies with your source water and your measuring method.\u003c\/p\u003e\n\u003cp\u003eUse mixed saltwater within about 24 hours. Left standing, alkalinity drifts down and carbonate can precipitate out on the bottom of the drum.\u003c\/p\u003e\n\n\u003ch3\u003eSuitable for, and not suitable for\u003c\/h3\u003e\n\u003ch4\u003eSuitable for\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eMixed reefs, LPS and soft coral systems in an active growth phase\u003c\/li\u003e\n\u003cli\u003eFrag tanks and coral grow-out systems\u003c\/li\u003e\n\u003cli\u003eNew reef tanks still building coral mass\u003c\/li\u003e\n\u003cli\u003eReefers who want water changes alone to hold foundation levels\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eNot suitable for\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eFreshwater aquariums of any kind - this is a full synthetic seawater mix, not a tonic salt\u003c\/li\u003e\n\u003cli\u003eMature SPS systems already running at 7-8 dKH; a jump to 12 dKH at a water change can burn tips. \u003ca href=\"\/products\/red-sea-salt-20kg-refill-box-600ltr\"\u003eRed Sea Salt\u003c\/a\u003e at 7.7-8.2 dKH is the match there\u003c\/li\u003e\n\u003cli\u003eTopping up evaporation - always top up with fresh RO water, never with saltwater\u003c\/li\u003e\n\u003cli\u003eMarine fish-only systems, where the elevated foundation levels are simply not consumed\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eCare and storage\u003c\/h3\u003e\n\u003cp\u003eKeep the lid sealed and the bucket up off a concrete garage floor. Salt draws moisture and sets hard, and while a clumped bucket still works, the amount of salt per scoop changes - weigh it rather than scoop it if it has gone solid.\u003c\/p\u003e\n\u003cp\u003eA 7 kg bucket opened and used within about three months will still mix clear at the bottom.\u003c\/p\u003e\n\n\u003ch3\u003eGoes well with\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/red-sea-seawater-refractometer\"\u003eRed Sea Seawater Refractometer\u003c\/a\u003e - sets your actual salinity, since the pack rating is only a starting point.\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/red-sea-salt-measuring-cup\"\u003eRed Sea Salt Measuring Cup\u003c\/a\u003e - keeps scoops consistent between mixes.\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/red-sea-reef-foundation-pro-multi-testing-kit\"\u003eRed Sea Reef Foundation Pro Multi Test Kit\u003c\/a\u003e - confirms the calcium, alkalinity and magnesium you actually landed on.\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/red-sea-coral-pro-sea-salts-22-kg-660-ltr-bucket\"\u003eCoral Pro Salt 22 kg bucket\u003c\/a\u003e - the step up when 210 litres stops lasting the month.\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/red-sea-coral-colors-pro-test-kit\"\u003eRed Sea Coral Colours Pro Test Kit\u003c\/a\u003e - for the iodine, potassium and iron that water changes alone will not hold.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWarranty and delivery\u003c\/h3\u003e\n\u003cp\u003eAs a consumable, salt carries no service warranty, but it is covered by the consumer guarantees under Australian Consumer Law. If a bucket arrives damaged, contaminated or will not dissolve, we replace it.\u003c\/p\u003e\n\u003cp\u003eAt 7 kg this ships as a standard parcel. Check the seal on arrival - a split bucket that has taken moisture in transit is worth reporting before you mix it.\u003c\/p\u003e\n\n\u003ch3\u003eCommon questions\u003c\/h3\u003e\n\u003ch4\u003eHow much water does a 7 kg bucket of Coral Pro Salt make?\u003c\/h4\u003e\n\u003cp\u003eA 7 kg bucket of Red Sea Coral Pro Salt makes 210 litres of seawater at 35 ppt, which is Red Sea's pack rating of 1 kg per 30 litres. The exact dose needed to hit 35 ppt varies slightly with source water, so set the final salinity with a refractometer rather than by weight alone.\u003c\/p\u003e\n\u003ch4\u003eWhat is the difference between Coral Pro Salt and standard Red Sea Salt?\u003c\/h4\u003e\n\u003cp\u003eCoral Pro Salt mixes to 11.5-12.5 dKH with calcium at 450-480 mg\/L, while standard Red Sea Salt mixes to 7.7-8.2 dKH with calcium at 415-445 mg\/L. Coral Pro is aimed at reefs actively building skeleton; standard Red Sea Salt suits mature systems already held at natural seawater alkalinity.\u003c\/p\u003e\n\u003ch4\u003eCan I use Coral Pro Salt in a fish-only marine tank?\u003c\/h4\u003e\n\u003cp\u003eIt is safe in a fish-only marine tank, but the elevated calcium, magnesium and carbonate exist to build coral skeleton and go unused without corals. Standard Red Sea Salt is the more sensible choice for fish-only and FOWLR systems.\u003c\/p\u003e\n\u003ch4\u003eWhy did my alkalinity read lower than 12 dKH after mixing?\u003c\/h4\u003e\n\u003cp\u003eFreshly mixed saltwater loses alkalinity as carbonate precipitates out if it is left standing or aerated hard for more than a day. Mix, aerate until clear, and use the water within about 24 hours rather than storing it for a week.\u003c\/p\u003e\n\u003ch4\u003eDoes the water need aerating before use?\u003c\/h4\u003e\n\u003cp\u003eYes. Circulate and aerate until the water is completely clear, normally about 20 minutes with this formula, because part-dissolved saltwater puts undissolved carbonate straight into the display tank.\u003c\/p\u003e","brand":"RedSea","offers":[{"title":"Default Title","offer_id":55242298294563,"sku":"BA0303","price":68.0,"currency_code":"AUD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0972\/7236\/5347\/files\/red-sea-coral-pro-sea-salts-43876739088675.webp?v=1790239782"},{"product_id":"red-sea-salt-7kg-bucket","title":"Red Sea Salt - 7kg bucket","description":"\u003cp\u003e\u003cstrong\u003eConsistent reef-grade seawater in under 20 minutes, from bucket to tank.\u003c\/strong\u003e Red Sea Salt is the brand's original moderate-alkalinity formulation — a balanced mix of major and minor elements suited to both fish-only systems and naturally-run reef tanks. This 7 kg bucket makes approximately 210 L of mixed saltwater.\u003c\/p\u003e\n\u003ch3\u003eKey features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMakes 210 L per bucket\u003c\/strong\u003e — check the current cost per litre on the product page when budgeting for a water change.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eModerate alkalinity, 8 dKH\u003c\/strong\u003e — a balanced formulation suited to fish-only systems and reef tanks running natural, undosed nutrient levels.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDissolves fast and clear\u003c\/strong\u003e — Red Sea states the current formula mixes from bucket to tank-ready in around 20 minutes.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConsistent batch to batch\u003c\/strong\u003e — the same balance of calcium, magnesium and bicarbonates every bucket, so parameters don't drift with each water change.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003ePack size\u003c\/th\u003e\n\u003ctd\u003e7 kg bucket\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMakes\u003c\/th\u003e\n\u003ctd\u003eApproximately 210 L of mixed saltwater\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAlkalinity\u003c\/th\u003e\n\u003ctd\u003e8 dKH\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFormulation\u003c\/th\u003e\n\u003ctd\u003eModerate, balanced — calcium, magnesium and bicarbonates at natural, undosed levels\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSuited to\u003c\/th\u003e\n\u003ctd\u003eFish-only marine systems and naturally-run reef tanks\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003eRed Sea doesn't publish exact calcium, alkalinity and magnesium figures for this formulation on its consumer-facing pages — target parameters can be checked using Red Sea's MyBatch batch-lookup service with the batch number printed on the bucket.\u003c\/p\u003e\n\u003ch3\u003eWhich size do I need?\u003c\/h3\u003e\n\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003ePack size\u003c\/th\u003e\n\u003cth\u003eMakes\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eRed Sea Salt 7 kg bucket (this product)\u003c\/td\u003e\n\u003ctd\u003e210 L\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRed Sea Salt 10 kg bag\u003c\/td\u003e\n\u003ctd\u003e300 L\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRed Sea Salt 20 kg refill box\u003c\/td\u003e\n\u003ctd\u003e600 L\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRed Sea Salt 25.2 kg bag\u003c\/td\u003e\n\u003ctd\u003e750 L\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003eLitre for litre, the 10 kg bag is currently the cheapest way to buy Red Sea Salt — the bucket format costs a little more per litre for the convenience of a smaller, resealable, easy-to-store container. If storage space and top-up frequency aren't a constraint, a larger pack is the better long-run buy.\u003c\/p\u003e\n\u003ch3\u003eDosage and directions\u003c\/h3\u003e\n\u003cp\u003eMix into RO or RO\/DI water with circulation and, ideally, some aeration, allowing the salt to fully dissolve before checking parameters. Match temperature and salinity to your display before adding, and use freshly mixed saltwater promptly rather than storing it mixed for extended periods. For reef tanks running elevated, dosed parameters rather than natural levels, Red Sea's Coral Pro Salt is the higher-alkalinity alternative in the same range.\u003c\/p\u003e\n\u003ch3\u003eSuitable for, and not suitable for\u003c\/h3\u003e\n\u003cp\u003eSuitable for fish-only marine systems and reef tanks kept at natural, undosed nutrient and alkalinity levels. Less suited to SPS-dominant reef systems chasing elevated calcium and alkalinity through dosing — Red Sea Coral Pro Salt is formulated for that use case instead.\u003c\/p\u003e\n\u003ch3\u003eWarranty and delivery\u003c\/h3\u003e\n\u003cp\u003eConsumer guarantee rights under Australian Consumer Law apply. Standard delivery — no special freight requirements for this pack size.\u003c\/p\u003e\n\u003ch3\u003eGoes well with\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/red-sea-salt-measuring-cup\"\u003eRed Sea Salt Measuring Cup\u003c\/a\u003e — for consistent, repeatable scoops batch after batch\u003c\/li\u003e\n\u003cli\u003eA refractometer, to verify salinity once mixed and temperature-stable\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eCommon questions\u003c\/h3\u003e\n\u003ch4\u003eHow much water does one 7 kg bucket make?\u003c\/h4\u003e\n\u003cp\u003eApproximately 210 L of mixed saltwater at standard reef salinity.\u003c\/p\u003e\n\u003ch4\u003eIs this the same salt as the bigger bags, just smaller?\u003c\/h4\u003e\n\u003cp\u003eYes — Red Sea Salt is the same moderate-alkalinity formulation across the 7 kg bucket, 10 kg bag, 20 kg refill box and 25.2 kg bag. Only the pack size and cost per litre change.\u003c\/p\u003e\n\u003ch4\u003eIs the bucket better value than the bigger bags?\u003c\/h4\u003e\n\u003cp\u003eNot quite — compare the current cost per litre for each pack size on the product page before deciding. The bucket earns its place as a smaller, resealable, easier-to-store option rather than as the cheapest per litre.\u003c\/p\u003e\n\u003ch4\u003eWill this suit my reef tank, or do I need Coral Pro?\u003c\/h4\u003e\n\u003cp\u003eIf you're running natural, undosed parameters, Red Sea Salt suits your tank. If you're dosing to elevated calcium and alkalinity for SPS growth, Coral Pro Salt is Red Sea's formulation for that.\u003c\/p\u003e","brand":"RedSea","offers":[{"title":"Default Title","offer_id":55242298327331,"sku":"BA0290","price":56.95,"currency_code":"AUD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0972\/7236\/5347\/files\/red-sea-salt-7kg-bucket-43876739154211.webp?v=1790239784"},{"product_id":"red-sea-salts-4-kg-120-ltr-bag","title":"Red Sea Salts - 4 kg (120 Ltr Bag)","description":"\u003cp\u003e\u003cstrong\u003eOur best cost-per-litre pack in the Red Sea Salt range.\u003c\/strong\u003e Red Sea Salt is a premium reef-grade marine salt mix that dissolves fast and clean to a balanced calcium, alkalinity and magnesium profile. This 4 kg bag mixes to roughly 104 L at full reef salinity — enough for a run of water changes on a small-to-mid system — and, litre for litre, it costs less than either the 2 kg bag or the 22 kg bucket we stock.\u003c\/p\u003e\u003ch3\u003eKey features\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOne salt, three targets\u003c\/strong\u003e — the same formula mixes to a lighter fish-only salinity, a mid invertebrate salinity, or full reef salinity, just by changing how much you dose. See the mix ratio table below.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDissolves fast and clear\u003c\/strong\u003e — no cloudiness or residue once mixed and aerated.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFree of nitrate and phosphate\u003c\/strong\u003e — won't feed algae or push a reef tank off balance.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eMix ratio and resulting parameters\u003c\/h3\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eSystem type\u003c\/th\u003e\n\u003cth\u003eDose\u003c\/th\u003e\n\u003cth\u003eSalinity\u003c\/th\u003e\n\u003cth\u003eCalcium\u003c\/th\u003e\n\u003cth\u003eAlkalinity\u003c\/th\u003e\n\u003cth\u003eMagnesium\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eFish-only\u003c\/td\u003e\n\u003ctd\u003e33.4 g\/L\u003c\/td\u003e\n\u003ctd\u003e31.0 ppt\u003c\/td\u003e\n\u003ctd\u003e365–395 mg\/L\u003c\/td\u003e\n\u003ctd\u003e6.8–7.3 dKH\u003c\/td\u003e\n\u003ctd\u003e1,100–1,180 mg\/L\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNon-coral invertebrates\u003c\/td\u003e\n\u003ctd\u003e36.0 g\/L\u003c\/td\u003e\n\u003ctd\u003e33.5 ppt\u003c\/td\u003e\n\u003ctd\u003e390–420 mg\/L\u003c\/td\u003e\n\u003ctd\u003e7.3–7.8 dKH\u003c\/td\u003e\n\u003ctd\u003e1,170–1,230 mg\/L\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCoral and reef\u003c\/td\u003e\n\u003ctd\u003e38.2 g\/L\u003c\/td\u003e\n\u003ctd\u003e35.0–35.5 ppt\u003c\/td\u003e\n\u003ctd\u003e415–445 mg\/L\u003c\/td\u003e\n\u003ctd\u003e7.7–8.2 dKH\u003c\/td\u003e\n\u003ctd\u003e1,240–1,320 mg\/L\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003cp\u003eAdd salt to water, not water to salt. Mix vigorously without aeration for 30 minutes to 2 hours until the pH settles at 8.2–8.5, then bring the mix to tank temperature and check salinity with a refractometer before use.\u003c\/p\u003e\u003ch3\u003eWhich pack size is cheapest per litre?\u003c\/h3\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003ePack\u003c\/th\u003e\n\u003cth\u003eLitres at reef salinity\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e2 kg bag\u003c\/td\u003e\n\u003ctd\u003e~52 L\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e4 kg bag\u003c\/td\u003e\n\u003ctd\u003e~104 L\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e22 kg bucket\u003c\/td\u003e\n\u003ctd\u003e~575 L\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003cp\u003eThe 4 kg bag is the cheapest per litre of the three sizes we stock. If you're only topping up a nano tank the 2 kg bag still makes sense, and if you'd rather change bags less often the 22 kg bucket is more convenient — but on price per litre alone, this is the one to buy.\u003c\/p\u003e\u003ch3\u003eSuitable for, and not suitable for\u003c\/h3\u003e\u003cp\u003eSuitable for fish-only, invertebrate and coral\/reef marine systems — the target salinity changes, the salt doesn't. Not a substitute for Coral Pro Salt if you're chasing higher baseline alkalinity for SPS-heavy growth; the two can be swapped between, but only gradually (max 15% of a water change at a time) because of the alkalinity step up.\u003c\/p\u003e\u003ch3\u003eCare and maintenance\u003c\/h3\u003e\u003cp\u003eStore the sealed bag somewhere dry — a damp storage area will clump the salt before you get to use it. Mix in a clean, dedicated bucket and let the water reach tank temperature before dosing, to avoid a temperature shock on the tank it's going into.\u003c\/p\u003e\u003ch3\u003eWarranty and delivery\u003c\/h3\u003e\u003cp\u003eSold as a consumable, not a warranted item beyond your consumer guarantee rights under Australian Consumer Law — if a bag arrives damaged or short-filled, contact us for a replacement.\u003c\/p\u003e\u003ch3\u003eCommon questions\u003c\/h3\u003e\u003ch4\u003eWhy is the 4 kg bag cheaper per litre than the 22 kg bucket?\u003c\/h4\u003e\u003cp\u003eIt comes down to how each pack size is currently priced, not a difference in the salt itself — check the comparison table above rather than assuming the biggest pack is automatically the cheapest.\u003c\/p\u003e\u003ch4\u003eHow much water does a 4 kg bag actually make?\u003c\/h4\u003e\u003cp\u003eAround 104 L mixed to full reef salinity (38.2 g\/L). Mixed lighter, for a fish-only tank at 33.4 g\/L, the same bag goes further — about 120 L.\u003c\/p\u003e\u003ch4\u003eWhat's the difference between this and Coral Pro Salt?\u003c\/h4\u003e\u003cp\u003eCoral Pro Salt carries a higher baseline alkalinity aimed at faster SPS coral growth. Elemental composition is otherwise similar, and you can switch between the two — just do it gradually across water changes rather than all at once.\u003c\/p\u003e\u003ch4\u003eIs this the same formula as the 2 kg and 22 kg packs?\u003c\/h4\u003e\u003cp\u003eYes — identical salt, just a different pack size and price point.\u003c\/p\u003e","brand":"RedSea","offers":[{"title":"Default Title","offer_id":55242298425635,"sku":"BA0232","price":30.0,"currency_code":"AUD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0972\/7236\/5347\/files\/red-sea-salts-4-kg-120-ltr-b-43106818359587.webp?v=1790233227"},{"product_id":"red-sea-salts-2-kg-60-ltr-bag","title":"Red Sea Salts - 2 kg (60 Ltr Bag)","description":"\u003cp\u003e\u003cstrong\u003eBalanced reef-grade seawater you mix fresh, right before it goes in the tank.\u003c\/strong\u003e Red Sea Salt is a premium marine salt mix built around a consistent calcium, alkalinity and magnesium balance rather than a headline number alone, so a bucket mixed today reads close to the last one. This 2 kg bag is the nano and top-up size — enough for a small water change or two, not a full system mix.\u003c\/p\u003e\u003ch3\u003eKey features\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOne salt, three targets\u003c\/strong\u003e — the same formula mixes to a lighter fish-only salinity, a mid invertebrate salinity, or full reef salinity, just by changing how much you dose. See the mix ratio table below.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDissolves fast and clear\u003c\/strong\u003e — no cloudiness or residue once mixed and aerated.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFree of nitrate and phosphate\u003c\/strong\u003e — won't feed algae or push a reef tank off balance on day one.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eMix ratio and resulting parameters\u003c\/h3\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eSystem type\u003c\/th\u003e\n\u003cth\u003eDose\u003c\/th\u003e\n\u003cth\u003eSalinity\u003c\/th\u003e\n\u003cth\u003eCalcium\u003c\/th\u003e\n\u003cth\u003eAlkalinity\u003c\/th\u003e\n\u003cth\u003eMagnesium\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eFish-only\u003c\/td\u003e\n\u003ctd\u003e33.4 g\/L\u003c\/td\u003e\n\u003ctd\u003e31.0 ppt\u003c\/td\u003e\n\u003ctd\u003e365–395 mg\/L\u003c\/td\u003e\n\u003ctd\u003e6.8–7.3 dKH\u003c\/td\u003e\n\u003ctd\u003e1,100–1,180 mg\/L\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNon-coral invertebrates\u003c\/td\u003e\n\u003ctd\u003e36.0 g\/L\u003c\/td\u003e\n\u003ctd\u003e33.5 ppt\u003c\/td\u003e\n\u003ctd\u003e390–420 mg\/L\u003c\/td\u003e\n\u003ctd\u003e7.3–7.8 dKH\u003c\/td\u003e\n\u003ctd\u003e1,170–1,230 mg\/L\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCoral and reef\u003c\/td\u003e\n\u003ctd\u003e38.2 g\/L\u003c\/td\u003e\n\u003ctd\u003e35.0–35.5 ppt\u003c\/td\u003e\n\u003ctd\u003e415–445 mg\/L\u003c\/td\u003e\n\u003ctd\u003e7.7–8.2 dKH\u003c\/td\u003e\n\u003ctd\u003e1,240–1,320 mg\/L\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003cp\u003eAdd salt to water, not water to salt. Mix vigorously without aeration for 30 minutes to 2 hours until the pH settles at 8.2–8.5, then bring the mix to tank temperature and check salinity with a refractometer before use.\u003c\/p\u003e\u003ch3\u003eWhich pack size is cheapest per litre?\u003c\/h3\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003ePack\u003c\/th\u003e\n\u003cth\u003eLitres at reef salinity\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e2 kg bag\u003c\/td\u003e\n\u003ctd\u003e~52 L\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e4 kg bag\u003c\/td\u003e\n\u003ctd\u003e~104 L\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e22 kg bucket\u003c\/td\u003e\n\u003ctd\u003e~575 L\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003cp\u003eThe 4 kg bag is actually the cheapest per litre of the three sizes we stock — not the bucket. If you're topping up a nano tank or trying this salt for the first time, the 2 kg bag is still the right call; for anything you'll be mixing regularly, the 4 kg is worth stepping up to before the 22 kg bucket.\u003c\/p\u003e\u003ch3\u003eSuitable for, and not suitable for\u003c\/h3\u003e\u003cp\u003eSuitable for fish-only, invertebrate and coral\/reef marine systems — the target salinity changes, the salt doesn't. Not a substitute for Coral Pro Salt if you're chasing higher baseline alkalinity for SPS-heavy growth; the two can be swapped between, but only gradually (max 15% of a water change at a time) because of the alkalinity step up.\u003c\/p\u003e\u003ch3\u003eCare and maintenance\u003c\/h3\u003e\u003cp\u003eStore the sealed bag somewhere dry — a damp storage area will clump the salt before you get to use it. Mix in a clean, dedicated bucket and let the water reach tank temperature before dosing, to avoid a temperature shock on the tank it's going into.\u003c\/p\u003e\u003ch3\u003eWarranty and delivery\u003c\/h3\u003e\u003cp\u003eSold as a consumable, not a warranted item beyond your consumer guarantee rights under Australian Consumer Law — if a bag arrives damaged or short-filled, contact us for a replacement.\u003c\/p\u003e\u003ch3\u003eCommon questions\u003c\/h3\u003e\u003ch4\u003eIs Red Sea Salt reef safe?\u003c\/h4\u003e\u003cp\u003eYes. It's designed for fish-only, invertebrate and coral\/reef systems alike — mixing it to a lower or higher salinity target changes which system it suits, not the formula itself.\u003c\/p\u003e\u003ch4\u003eHow much water does a 2 kg bag actually make?\u003c\/h4\u003e\u003cp\u003eAround 52 L mixed to full reef salinity (38.2 g\/L). Mixed lighter, for a fish-only tank at 33.4 g\/L, the same bag goes further — about 60 L.\u003c\/p\u003e\u003ch4\u003eWhat's the difference between this and Coral Pro Salt?\u003c\/h4\u003e\u003cp\u003eCoral Pro Salt carries a higher baseline alkalinity aimed at faster SPS coral growth. Elemental composition is otherwise similar, and you can switch between the two — just do it gradually across water changes rather than all at once.\u003c\/p\u003e\u003ch4\u003eDo I need a refractometer to use this?\u003c\/h4\u003e\u003cp\u003eYes — a swing-arm hydrometer isn't accurate enough for reef salinity. We stock a seawater-calibrated refractometer if you don't already have one.\u003c\/p\u003e","brand":"RedSea","offers":[{"title":"Default Title","offer_id":55242298556707,"sku":"BA0189","price":18.0,"currency_code":"AUD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0972\/7236\/5347\/files\/red-sea-salts-2-kg-60-ltr-ba-43106954871075.webp?v=1790233227"},{"product_id":"red-sea-coral-pro-sea-salts-25kg-sack-600-ltrs","title":"Red Sea Coral Pro Sea Salts - 25kg sack (600 ltrs)","description":"\u003cp\u003e\u003cstrong\u003eRed Sea Coral Pro reef salt, made for mixed reefs and SPS coral tanks.\u003c\/strong\u003e Coral Pro Salt is Red Sea's salt mix for reef aquariums, and Red Sea describes it as ideal for mixed reefs and SPS frag tanks (SPS means small polyp stony corals such as Acropora; a frag tank is a tank for growing coral cuttings). Red Sea makes it with balanced levels of the foundation elements (calcium, magnesium and alkalinity, which corals use to build their skeletons), with alkalinity at about 12 dKH (degrees of carbonate hardness, the usual unit for alkalinity).\u003c\/p\u003e\n\u003ch3\u003eKey features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAlkalinity of about 12 dKH\u003c\/strong\u003e, as stated by Red Sea.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNo toxic levels of heavy metals and no chemical binders\u003c\/strong\u003e, according to Red Sea.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConsistent in small batches:\u003c\/strong\u003e low moisture content, and Red Sea guarantees its parameters for a mix as small as 10 litres.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuick to mix:\u003c\/strong\u003e Red Sea says it takes about 20 minutes from bucket to tank.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eType: reef aquarium salt mix\u003c\/li\u003e\n\u003cli\u003eAlkalinity: about 12 dKH (Red Sea figure)\u003c\/li\u003e\n\u003cli\u003eMixing rate: Red Sea rates Coral Pro at about 30 litres of seawater per kilogram (7 kg makes 210 litres, 22 kg makes 660 litres)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eSuitable for, and not suitable for\u003c\/h3\u003e\n\u003cp\u003eSuitable for marine reef aquariums, and recommended by Red Sea for mixed reefs and SPS frag tanks. Not for freshwater aquariums. If your tank already runs at a lower alkalinity, raise it gradually rather than with one large water change, as a sudden jump can stress corals.\u003c\/p\u003e\n\u003ch3\u003eCare\u003c\/h3\u003e\n\u003cp\u003eMix with RO water (water purified by reverse osmosis to remove most dissolved minerals) in a clean container, and check the salinity with a refractometer (a tool that measures how salty the water is) before adding it to the tank. Keep the sack sealed and dry between uses, as salt mix takes up moisture from the air.\u003c\/p\u003e\n\u003ch3\u003eWarranty and delivery\u003c\/h3\u003e\n\u003cp\u003eYour rights under Australian Consumer Law apply. Large item; freight is quoted and emailed to you, as set out in our Shipping Policy.\u003c\/p\u003e","brand":"RedSea","offers":[{"title":"Default Title","offer_id":55242298589475,"sku":"BA0152","price":189.0,"currency_code":"AUD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0972\/7236\/5347\/files\/red-sea-coral-pro-sea-salts-43876739186979.webp?v=1790239781"},{"product_id":"aqua-medic-reef-salt-coral-20kg-bucket","title":"Aqua Medic Reef Salt Coral 20kg Bucket","description":"\u003cp\u003e\u003cstrong\u003ePublishes the calcium and magnesium numbers most reef salts leave off the label.\u003c\/strong\u003e Aqua Medic Reef Salt Coral is a marine salt mix built around higher calcium and magnesium levels for coral-heavy systems, with a vitamin B complex added and a formulation Aqua Medic states dissolves without leaving residue. A 20 kg bucket makes 600 litres of mixed saltwater.\u003c\/p\u003e\u003ch3\u003eKey features\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDocumented mineral profile\u003c\/strong\u003e — calcium around 500 mg\/L and magnesium around 1,450 mg\/L at target salinity, figures Aqua Medic publishes rather than describing only as \"elevated\".\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e600 L per 20 kg bucket\u003c\/strong\u003e — works out to \u003cstrong\u003e$0.48 per litre of mixed saltwater\u003c\/strong\u003e at current pricing, calculated automatically from the pack price.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVitamin B complex added\u003c\/strong\u003e — included specifically to support coral growth alongside the elevated mineral base.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003epH buffered\u003c\/strong\u003e — formulated to hold pH stable through the mixing and dosing process.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDissolves without residue\u003c\/strong\u003e — no cloudy or gritty leftover in the mixing container once fully dissolved.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003ePack size\u003c\/th\u003e\n\u003ctd\u003e20 kg bucket\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWater made\u003c\/th\u003e\n\u003ctd\u003e600 L\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCost per litre\u003c\/th\u003e\n\u003ctd\u003e$0.48 per litre of mixed saltwater\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCalcium\u003c\/th\u003e\n\u003ctd\u003eApprox. 500 mg\/L\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMagnesium\u003c\/th\u003e\n\u003ctd\u003eApprox. 1,450 mg\/L\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBicarbonate\u003c\/th\u003e\n\u003ctd\u003eApprox. 210 mg\/L\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSodium\u003c\/th\u003e\n\u003ctd\u003eApprox. 10,500 mg\/L\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eChloride\u003c\/th\u003e\n\u003ctd\u003eApprox. 19,800 mg\/L\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSulphate\u003c\/th\u003e\n\u003ctd\u003eApprox. 2,200 mg\/L\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eStrontium\u003c\/th\u003e\n\u003ctd\u003eApprox. 16 mg\/L\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\u003ch3\u003eWhich Aqua Medic salt do I need?\u003c\/h3\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eSalt\u003c\/th\u003e\n\u003cth\u003eBest for\u003c\/th\u003e\n\u003cth\u003eYield (20 kg)\u003c\/th\u003e\n\u003cth\u003eNotable minerals\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eReef Salt Coral (this product)\u003c\/td\u003e\n\u003ctd\u003eCoral-heavy systems prioritising growth and colouration\u003c\/td\u003e\n\u003ctd\u003e600 L\u003c\/td\u003e\n\u003ctd\u003eCa approx. 500 mg\/L, Mg approx. 1,450 mg\/L, added vitamin B complex\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eReef Salt\u003c\/td\u003e\n\u003ctd\u003eGeneral reef and fish-only marine systems\u003c\/td\u003e\n\u003ctd\u003e600 L\u003c\/td\u003e\n\u003ctd\u003eElevated Ca and alkalinity reserve, enhanced Sr and I, no published assay\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\u003cp\u003eBoth mix to the same 600 L per 20 kg bucket. Reef Salt Coral is the better-documented option if you're tracking Ca and Mg landing points against a stated figure rather than a general \"elevated\" claim.\u003c\/p\u003e\u003ch3\u003eSuitable for, and not suitable for\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSuitable for:\u003c\/strong\u003e coral-heavy reef systems where consistent calcium and magnesium supply matters for growth and colouration.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNot suitable for:\u003c\/strong\u003e freshwater tanks. Fish-only marine systems can use it, but the coral-focused mineral loading is unnecessary extra cost if you're not keeping coral.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eDosage and directions\u003c\/h3\u003e\u003cp\u003eMix into RO\/DI water using a powerhead or pump to circulate until fully dissolved. Check salinity with a refractometer and allow the freshly mixed batch to reach system temperature before use in a water change or top-off.\u003c\/p\u003e\u003ch3\u003eWarranty and delivery\u003c\/h3\u003e\u003cp\u003eConsumable water-care product; standard freight. Keep the bucket sealed and dry between uses to prevent clumping.\u003c\/p\u003e\u003ch3\u003eCommon questions\u003c\/h3\u003e\u003ch4\u003eHow is this different from standard Aqua Medic Reef Salt?\u003c\/h4\u003e\u003cp\u003eReef Salt Coral carries a published, higher calcium and magnesium profile and added vitamin B complex aimed at coral growth. Standard Reef Salt is formulated around an \"elevated\" calcium and alkalinity reserve without a published mineral assay. Both yield 600 L per 20 kg bucket.\u003c\/p\u003e\u003ch4\u003eWhat salinity are the mineral figures measured at?\u003c\/h4\u003e\u003cp\u003eThe published calcium, magnesium and bicarbonate figures are for water mixed to the product's target marine salinity — verify with a refractometer or hydrometer at your own target before dosing further.\u003c\/p\u003e\u003ch4\u003eIs the extra cost per litre worth it over standard Reef Salt?\u003c\/h4\u003e\u003cp\u003eAt $0.48 versus $0.43 per litre, the difference is about 5 cents per litre. For coral-heavy systems the documented higher Ca and Mg levels plus the vitamin B complex are the trade-off; for a fish-only or lightly stocked tank, standard Reef Salt covers the same salinity at a lower cost per litre.\u003c\/p\u003e","brand":"Aqua Medic","offers":[{"title":"Default Title","offer_id":55285032452387,"sku":"AM30103","price":287.95,"currency_code":"AUD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0972\/7236\/5347\/files\/aqua-medic-reef-salt-coral-2-43506872746275.webp?v=1790234314"},{"product_id":"aqua-medic-reef-salt-20kg-bucket","title":"Aqua Medic Reef Salt 20kg Bucket","description":"\u003cp\u003e\u003cstrong\u003eMixes to under 44 cents a litre and doesn't lean on chelating agents to hit its numbers.\u003c\/strong\u003e Aqua Medic Reef Salt is a marine salt mix formulated for reef and fish-only saltwater aquariums, dissolving to 35‰ salinity at a ratio of 38 g of salt per litre of water. A 20 kg bucket makes 600 litres of mixed saltwater — enough for a full 400 L system change with margin for top-offs.\u003c\/p\u003e\u003ch3\u003eKey features\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e38 g\/L mix ratio\u003c\/strong\u003e — dissolves to 35‰ salinity, the standard reef target, without needing to over- or under-dose to compensate.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e600 L per 20 kg bucket\u003c\/strong\u003e — works out to \u003cstrong\u003e$0.43 per litre of mixed saltwater\u003c\/strong\u003e at current pricing, calculated automatically from the pack price so it always reflects what you'd actually pay.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eElevated calcium and alkalinity reserve\u003c\/strong\u003e — formulated to hold Ca and KH up without relying on chelating agents, which some reefers avoid over concerns about long-term trace element binding.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEnhanced strontium and iodine\u003c\/strong\u003e — included above baseline levels alongside the standard trace element package.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNo nitrates or phosphates\u003c\/strong\u003e — won't contribute to nuisance algae load on mixing day.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003ePack size\u003c\/th\u003e\n\u003ctd\u003e20 kg bucket\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWater made\u003c\/th\u003e\n\u003ctd\u003e600 L\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMix ratio\u003c\/th\u003e\n\u003ctd\u003e38 g of salt per litre of water\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTarget salinity\u003c\/th\u003e\n\u003ctd\u003e35‰\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCost per litre\u003c\/th\u003e\n\u003ctd\u003e$0.43 per litre of mixed saltwater\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFormulation\u003c\/th\u003e\n\u003ctd\u003eStandard reef and fish-only marine salt\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\u003ch3\u003eWhich Aqua Medic salt do I need?\u003c\/h3\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eSalt\u003c\/th\u003e\n\u003cth\u003eBest for\u003c\/th\u003e\n\u003cth\u003eYield (20 kg)\u003c\/th\u003e\n\u003cth\u003eNotable minerals\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eReef Salt (this product)\u003c\/td\u003e\n\u003ctd\u003eGeneral reef and fish-only marine systems\u003c\/td\u003e\n\u003ctd\u003e600 L\u003c\/td\u003e\n\u003ctd\u003eElevated Ca and alkalinity reserve, enhanced Sr and I\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eReef Salt Coral\u003c\/td\u003e\n\u003ctd\u003eCoral-heavy systems prioritising growth and colouration\u003c\/td\u003e\n\u003ctd\u003e600 L\u003c\/td\u003e\n\u003ctd\u003eCa approx. 500 mg\/L, Mg approx. 1,450 mg\/L, added vitamin B complex\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\u003cp\u003eReef Salt Coral publishes exact calcium, magnesium and bicarbonate figures on its own listing; Aqua Medic markets the standard Reef Salt on its elevated reserve and trace element package rather than a published mineral assay, so if you want a documented Ca\/Mg\/KH landing point rather than a stated \"elevated\" claim, Reef Salt Coral is the better-documented choice. Both mix at the same 38 g\/L ratio and yield the same 600 L per 20 kg.\u003c\/p\u003e\u003ch3\u003eSuitable for, and not suitable for\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSuitable for:\u003c\/strong\u003e reef, FOWLR and fish-only marine aquariums needing a general-purpose salt mix.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNot suitable for:\u003c\/strong\u003e freshwater tanks, and reefers who specifically need a published, guaranteed mineral assay at time of mixing — see Reef Salt Coral above for that.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eDosage and directions\u003c\/h3\u003e\u003cp\u003eMix into RO\/DI water at 38 g per litre, using a powerhead or pump to circulate until fully dissolved — typically 15–30 minutes. Check salinity with a refractometer before adding to the display or topping off, and allow freshly mixed water to reach system temperature first.\u003c\/p\u003e\u003ch3\u003eWarranty and delivery\u003c\/h3\u003e\u003cp\u003eConsumable water-care product; standard freight. Store the bucket sealed and dry between uses to prevent clumping.\u003c\/p\u003e\u003ch3\u003eCommon questions\u003c\/h3\u003e\u003ch4\u003eHow many litres does one 20 kg bucket make?\u003c\/h4\u003e\u003cp\u003e600 litres of mixed saltwater at the standard 38 g\/L ratio for 35‰ salinity.\u003c\/p\u003e\u003ch4\u003eWhat's the actual cost per litre?\u003c\/h4\u003e\u003cp\u003e$0.43 per litre of mixed saltwater at current pricing — this figure is calculated live from the pack price, so it updates automatically if the price changes.\u003c\/p\u003e\u003ch4\u003eDoes this contain chelating agents?\u003c\/h4\u003e\u003cp\u003eNo — Aqua Medic states the elevated calcium and alkalinity reserve is achieved without them.\u003c\/p\u003e\u003ch4\u003eIs this the same as Reef Salt Coral?\u003c\/h4\u003e\u003cp\u003eNo. Both yield 600 L per 20 kg bucket at the same mix ratio, but Reef Salt Coral is formulated with published, higher calcium and magnesium figures and added vitamin B complex aimed at coral growth and colouration.\u003c\/p\u003e","brand":"Aqua Medic","offers":[{"title":"Default Title","offer_id":55285032485155,"sku":"AM30106","price":260.95,"currency_code":"AUD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0972\/7236\/5347\/files\/aqua-medic-reef-salt-20kg-bu-43506872713507.webp?v=1790234315"}],"url":"https:\/\/nicksaquariumoceanariumterrarium.com.au\/collections\/builder-salt.oembed","provider":"Nicks AOT","version":"1.0","type":"link"}