{"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-252kg-bag-750l-3003578-1600.jpg?v=1781836767","url":"https:\/\/nicksaquariumoceanariumterrarium.com.au\/products\/red-sea-salt-25-2kg-bag-750l","provider":"Nicks Aquarium Oceanarium Terrarium","version":"1.0","type":"link"}