{"product_id":"seachem-reef-advantage-calcium-supplement","title":"Seachem Reef Advantage Calcium","description":"\u003cp\u003e\u003cstrong\u003eSeachem Reef Advantage Calcium\u003c\/strong\u003e is a non-caustic ionic calcium blend that restores and maintains calcium at natural seawater levels, the foundation stony corals need to build their skeletons. Unlike kalkwasser (limewater), it stays in a safe pH range of 8.3 to 8.6, will not deplete magnesium, and, used as directed, will not pull down alkalinity. It also carries magnesium and strontium in proportionate ratios, so you maintain all three together. Browse our full range of \u003ca href=\"https:\/\/squeakysaquatics.com\/collections\/additives-supplements\"\u003ereef additives and supplements\u003c\/a\u003e and the rest of the \u003ca href=\"https:\/\/squeakysaquatics.com\/collections\/seachem\"\u003eSeachem lineup\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch3 style=\"margin: 16px 0 4px; font-size: 1.05em; font-weight: 600; line-height: 1.25; border-left: 4px solid #006064; padding-left: 8px;\"\u003eWhy Reefers Use It\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eNon-caustic.\u003c\/strong\u003e Holds a safe pH of 8.3 to 8.6, unlike the high pH of kalkwasser.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThree elements at once.\u003c\/strong\u003e Maintains calcium along with magnesium and strontium in proportionate ratios.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGentle on your numbers.\u003c\/strong\u003e Will not deplete magnesium, and will not crash alkalinity when used as directed.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEasy to dial in.\u003c\/strong\u003e Predictable calcium increase per dose makes it simple to hit your target.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 style=\"margin: 16px 0 4px; font-size: 1.05em; font-weight: 600; line-height: 1.25; border-left: 4px solid #006064; padding-left: 8px;\"\u003eHow to Use\u003c\/h3\u003e\n\u003cp\u003eDissolve 5 g (1 level teaspoon) in at least 250 mL (1 cup) of fresh water, then add it to the tank for every 150 litres (about 40 US gallons), twice a week. Each dose raises calcium by roughly 12 mg\/L. Do not exceed 10 g per 150 L per day, and test calcium every couple of weeks to adjust the amount or frequency. Do not mix Reef Advantage Calcium directly with a carbonate or alkalinity supplement; add them on alternate days or at least 30 minutes apart.\u003c\/p\u003e\n\u003ch3 style=\"margin: 16px 0 4px; font-size: 1.05em; font-weight: 600; line-height: 1.25; border-left: 4px solid #006064; padding-left: 8px;\"\u003eChoose Your Size\u003c\/h3\u003e\n\u003ctable style=\"border-collapse: collapse; width: 100%; font-size: 0.95em; margin: 6px 0 4px;\"\u003e\n\u003cthead\u003e\n\u003ctr style=\"background: #E0F7FA;\"\u003e\n\u003cth style=\"border: 1px solid #B2EBF2; padding: 7px 10px; text-align: left;\"\u003eSize\u003c\/th\u003e\n\u003cth style=\"border: 1px solid #B2EBF2; padding: 7px 10px; text-align: left;\"\u003eBest for\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #B2EBF2; padding: 7px 10px;\"\u003e\u003cstrong\u003e250 g\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #B2EBF2; padding: 7px 10px;\"\u003enano and single reef tanks\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #B2EBF2; padding: 7px 10px;\"\u003e\u003cstrong\u003e500 g\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #B2EBF2; padding: 7px 10px;\"\u003ea single reef tank, regular dosing\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #B2EBF2; padding: 7px 10px;\"\u003e\u003cstrong\u003e1 kg\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #B2EBF2; padding: 7px 10px;\"\u003elarger reefs and fish rooms\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3 style=\"margin: 16px 0 4px; font-size: 1.05em; font-weight: 600; line-height: 1.25; border-left: 4px solid #006064; padding-left: 8px;\"\u003eSpecifications\u003c\/h3\u003e\n\u003ctable style=\"border-collapse: collapse; width: 100%; font-size: 0.95em; margin: 6px 0 4px;\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #B2EBF2; padding: 7px 10px; width: 38%;\"\u003e\u003cstrong\u003eBrand\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #B2EBF2; padding: 7px 10px;\"\u003eSeachem\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #B2EBF2; padding: 7px 10px;\"\u003e\u003cstrong\u003eType\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #B2EBF2; padding: 7px 10px;\"\u003eNon-caustic reef calcium supplement\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #B2EBF2; padding: 7px 10px;\"\u003e\u003cstrong\u003epH\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #B2EBF2; padding: 7px 10px;\"\u003e8.3 to 8.6 (non-caustic, unlike kalkwasser)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #B2EBF2; padding: 7px 10px;\"\u003e\u003cstrong\u003eContains\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #B2EBF2; padding: 7px 10px;\"\u003eIonic calcium with magnesium and strontium (Ca:Mg:Sr 100:5:0.1)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #B2EBF2; padding: 7px 10px;\"\u003e\u003cstrong\u003eRaises\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #B2EBF2; padding: 7px 10px;\"\u003eAbout 12 mg\/L calcium per 5 g dose in 150 L\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #B2EBF2; padding: 7px 10px;\"\u003e\u003cstrong\u003eForm\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #B2EBF2; padding: 7px 10px;\"\u003ePowder (measuring scoop included)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #B2EBF2; padding: 7px 10px;\"\u003e\u003cstrong\u003eWater type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #B2EBF2; padding: 7px 10px;\"\u003eReef and saltwater only\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #B2EBF2; padding: 7px 10px;\"\u003e\u003cstrong\u003eDose\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #B2EBF2; padding: 7px 10px;\"\u003e5 g (1 tsp) per 150 L (about 40 gal) twice weekly, dissolved first\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #B2EBF2; padding: 7px 10px;\"\u003e\u003cstrong\u003eSizes\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #B2EBF2; padding: 7px 10px;\"\u003e250 g, 500 g, 1 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3 style=\"margin: 16px 0 4px; font-size: 1.05em; font-weight: 600; line-height: 1.25; border-left: 4px solid #006064; padding-left: 8px;\"\u003eRecommended Pairings\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/squeakysaquatics.com\/products\/seachem-reef-buffer-ph-alkalinity-83\"\u003eSeachem Reef Buffer\u003c\/a\u003e to maintain alkalinity, the partner to calcium in coral growth.\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/squeakysaquatics.com\/collections\/water-testing\"\u003eCalcium and alkalinity test kits\u003c\/a\u003e so you can dose to your numbers.\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/squeakysaquatics.com\/collections\/additives-supplements\"\u003eMore reef additives and supplements\u003c\/a\u003e to round out magnesium and trace elements.\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/squeakysaquatics.com\/collections\/salt-water\"\u003eSaltwater livestock and supplies\u003c\/a\u003e for the rest of your reef.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 style=\"margin: 16px 0 4px; font-size: 1.05em; font-weight: 600; line-height: 1.25; border-left: 4px solid #006064; padding-left: 8px;\"\u003eFAQ\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eHow is this different from kalkwasser?\u003c\/strong\u003e\u003cbr\u003eReef Advantage Calcium is non-caustic, so it will not spike pH the way limewater can. It also will not deplete magnesium and includes magnesium and strontium in the mix.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan I mix it with my alkalinity supplement?\u003c\/strong\u003e\u003cbr\u003eNo. Never combine calcium and carbonate supplements directly. Dose them on alternate days or at least 30 minutes apart so they do not react.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDo I need to dissolve the powder first?\u003c\/strong\u003e\u003cbr\u003eYes. Dissolve each dose in at least a cup of fresh water before adding it to the tank.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat calcium level should I aim for?\u003c\/strong\u003e\u003cbr\u003eKeep calcium in the natural seawater range, roughly 400 to 450 ppm, and test regularly to dose to that target.\u003c\/p\u003e","brand":"Seachem","offers":[{"title":"250 g","offer_id":48755794804955,"sku":"316","price":8.99,"currency_code":"USD","in_stock":true},{"title":"500 g","offer_id":48755794837723,"sku":"313","price":15.46,"currency_code":"USD","in_stock":true},{"title":"1 kg","offer_id":48755794870491,"sku":"317","price":26.74,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0767\/5209\/3403\/files\/0316-Reef-Adv-Calcium-250-g.png?v=1778226402","url":"https:\/\/squeakysaquatics.com\/products\/seachem-reef-advantage-calcium-supplement","provider":"Squeaky's Aquatics","version":"1.0","type":"link"}