{"product_id":"seachem-reef-advantage-calcium-500g","title":"Reef Advantage Calcium 500 g — Ionic Calcium pH 8.3 with Mg and Sr | Seachem","description":"\u003cp\u003eSeachem Reef Advantage Calcium in a 500g format is a non-caustic (pH 8.3–8.6) powdered ionic calcium supplement formulated to restore and maintain calcium levels at natural seawater levels in reef aquariums. Its formula includes magnesium and strontium in proportions corresponding to typical usage ratios (100:5:0.1, Ca:Mg:Sr), eliminating the need for separate supplements for these elements.\u003c\/p\u003e\n\n\u003ch2\u003e Main advantages\u003c\/h2\u003e\n\u003cul\u003e\n\n\u003cli\u003e Concentrated ionic calcium powder — 5 g per 150 L increases calcium by 12 mg\/L\u003c\/li\u003e\n\n\u003cli\u003e Non-caustic pH (8.3–8.6) — no risk of pH fluctuation unlike with kalkwasser\u003c\/li\u003e\n\n\u003cli\u003e Includes magnesium and strontium in typical usage ratios (100:5:0.1, Ca:Mg:Sr)\u003c\/li\u003e\n\n\u003cli\u003e Economical 500g format for medium to large aquariums\u003c\/li\u003e\n\n\u003cli\u003e Compatible with pre-mixed solution dosing pumps\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\n\u003ch2\u003e Use in reef aquariums\u003c\/h2\u003e\n\u003cp\u003e Calcium is essential for the growth of all SPS and LPS corals, as well as coralline algae. If calcium becomes deficient, growth ceases and coral health declines rapidly. Reef Advantage Calcium differs from Kalkwasser in that it maintains a safe pH of 8.3–8.6 and simultaneously retains magnesium and strontium. Seachem recommends maintaining calcium levels between 380 and 420 mg\/L with an alkalinity between 3 and 6 meq\/L (8–17 dKH).\u003c\/p\u003e\n\n\u003ch2\u003e Dosage\u003c\/h2\u003e\n\u003cul\u003e\n\n\u003cli\u003e Beginner: 5 g (1 level teaspoon) per 150 L (40 US gallons), twice a week. Dissolve in at least 250 ml (1 cup) of fresh water.\u003c\/li\u003e\n\n\u003cli\u003e Advanced: Dose until reaching 380–420 mg\/L. Each 5 g dose per 150 L increases calcium by 12 mg\/L. Do not exceed 10 g per 150 L per day.\u003c\/li\u003e\n\n\u003cli\u003e Expert: determine the consumption rate and configure a continuous drip. Formula: m = v × c ÷ 400 (m = grams, v = volume in liters, c = increase in mg\/L).\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\n\u003ch2\u003e Ingredients and guaranteed analysis\u003c\/h2\u003e\n\u003cp\u003e Ingredients: calcium chloride, magnesium chloride, strontium chloride.\u003c\/p\u003e\n\u003cul\u003e\n\n\u003cli\u003e Calcium (min): 335 mg\/g — (max): 347 mg\/g\u003c\/li\u003e\n\n\u003cli\u003e Magnesium (min): 17 mg\/g\u003c\/li\u003e\n\n\u003cli\u003e Strontium (min): 0.34 mg\/g\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\n\u003ch2\u003e Preparation for dosing pump\u003c\/h2\u003e\n\u003cp\u003e To create an automated dosing solution, dissolve 1 teaspoon (5 g) in 25–30 ml of water. According to Seachem, 165–200 g can be dissolved in 1 L of RO\/DI water. Calculate the weekly amount based on the consumption rate and divide by 7 for the daily dosage.\u003c\/p\u003e\n\n\u003ch2\u003e Manufacturer's precautions\u003c\/h2\u003e\n\u003cul\u003e\n\n\u003cli\u003e Do not exceed 10 g per 150 L per day\u003c\/li\u003e\n\n\u003cli\u003e Excess calcium can accelerate the loss of carbonate alkalinity.\u003c\/li\u003e\n\n\u003cli\u003e Do not mix directly with a carbonate supplement — alternate days or wait at least 30 minutes\u003c\/li\u003e\n\n\u003cli\u003e Causes serious eye irritation — keep out of reach of children, avoid skin contact\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\n\u003ch2\u003e Available formats\u003c\/h2\u003e\n\u003cul\u003e\n\n\u003cli\u003e 250 g\u003c\/li\u003e\n\n\u003cli\u003e 500 g\u003c\/li\u003e\n\n\u003cli\u003e 1 kg\u003c\/li\u003e\n\n\u003cli\u003e 4 kg\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\n\u003ch2\u003e Why choose Reef Advantage Calcium from ReefSolution?\u003c\/h2\u003e\n\u003cp\u003e For complete reef supplementation, combine Seachem Reef Advantage Calcium with Seachem Reef Carbonate for alkalinity and Seachem Reef Advantage Magnesium for magnesium. Monitor your levels with the Salifert Calcium Test Kit or the Hanna Checker Calcium. For a secondary source of bioavailable organic calcium, add Seachem Reef Calcium.\u003c\/p\u003e\n\n\u003ch2\u003e Frequently Asked Questions\u003c\/h2\u003e\n\n\u003ch3\u003e What is the difference between Reef Advantage Calcium and Reef Complete?\u003c\/h3\u003e\n\u003cp\u003e Both are Seachem ionic calcium supplements with magnesium and strontium in identical ratios. Reef Advantage Calcium is in powder form (more economical for larger volumes), while Reef Complete is in liquid form (easier to dose without pre-mixing).\u003c\/p\u003e\n\n\u003ch3\u003e Is a separate strontium supplement necessary with Reef Advantage Calcium?\u003c\/h3\u003e\n\u003cp\u003e No. Reef Advantage Calcium includes strontium and magnesium in proportions corresponding to typical usage rates (100:5:0.1, Ca:Mg:Sr). If used to maintain calcium levels, no additional strontium or magnesium supplementation is necessary.\u003c\/p\u003e\n\n\u003ch3\u003e Does Reef Advantage Calcium affect the pH of the aquarium?\u003c\/h3\u003e\n\u003cp\u003e No. The product mixes at a pH of 8.3–8.6, unlike kalkwasser which has a caustic pH that can cause dangerous fluctuations.\u003c\/p\u003e","brand":"Seachem","offers":[{"title":"Default Title","offer_id":38010071974059,"sku":"000116031301","price":28.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0513\/7108\/1899\/files\/Reef-Adv-Calcium-500-g__69791__25897.jpg?v=1773603954","url":"https:\/\/reefsolution.com\/en\/products\/seachem-reef-advantage-calcium-500g","provider":"Aquarium ReefSolution inc.","version":"1.0","type":"link"}