{"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\u003e$0.31 per litre mixed\u003c\/strong\u003e - at current pricing this pack works out more expensive per litre than the 22 kg bucket ($0.27), 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\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\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\u003e$0.27 per litre\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 at $0.27; this 20 kg refill box comes in at $0.31, and the 7 kg bucket at $0.32.\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\n","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-Box.jpg?v=1782108689","url":"https:\/\/nicksaquariumoceanariumterrarium.com.au\/products\/red-sea-coral-pro-salt-20kg-refill-box-600ltr","provider":"Nicks Aquarium Oceanarium Terrarium","version":"1.0","type":"link"}