{"product_id":"reef-advantage-calcium-1kg","title":"Reef Advantage Calcium 1 kg — Ionic Calcium pH 8.3 with Mg and Sr | Seachem","description":"\u003cp\u003eSeachem Reef Advantage Calcium in a 1 kg format is a non-caustic (pH 8.3–8.6) powdered ionic calcium supplement designed to restore and maintain calcium levels in reef aquariums. Its formula includes magnesium and strontium in proportions corresponding to typical usage ratios (100:5:0.1, Ca:Mg:Sr). The 1 kg format offers excellent value for money for aquarists who regularly dose calcium, especially those with high-consumption SPS coral systems.\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) — without risk of fluctuation, unlike kalkwasser\u003c\/li\u003e\n\n\u003cli\u003e Includes magnesium and strontium in natural ratios (100:5:0.1, Ca:Mg:Sr)\u003c\/li\u003e\n\n\u003cli\u003e 1 kg format — economical for regular dosing and high-demand systems\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 formation of the skeleton in SPS and LPS corals and coralline algae. A calcium deficiency causes growth to stop, followed by a rapid decline in coral health. Reef Advantage Calcium differs from kalkwasser in that it maintains a safe pH and the ability to simultaneously maintain magnesium and strontium levels without additional supplementation. Seachem recommends maintaining calcium 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 quantity based on the consumption rate and divide by 7 for the daily dosage. The 1 kg format allows for the preparation of several liters of concentrated solution in advance.\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 a complete reef program, combine Seachem Reef Advantage Calcium with Seachem Reef Carbonate for alkalinity and Seachem Reef Advantage Magnesium for magnesium. Monitor your parameters with the Salifert Calcium Test Kit or the Hanna Checker Calcium and automate your dosing with the Kamoer X1 Pro Dosing Pump.\u003c\/p\u003e\n\n\u003ch2\u003e Frequently Asked Questions\u003c\/h2\u003e\n\n\u003ch3\u003e Is the 1 kg format advantageous for automated dosing?\u003c\/h3\u003e\n\u003cp\u003e Yes. The 1 kg format allows you to prepare several liters of concentrated solution for dosing pumps. Dissolve 165 to 200 g per liter of RO\/DI water and dose daily according to your system's consumption.\u003c\/p\u003e\n\n\u003ch3\u003e Does Reef Advantage Calcium replace the need to test for strontium and magnesium?\u003c\/h3\u003e\n\u003cp\u003e Partially. The product includes Mg and Sr in typical usage ratios (100:5:0.1). For high-demand systems, supplementation with Seachem Reef Advantage Magnesium may be required depending on test results.\u003c\/p\u003e\n\n\u003ch3\u003e How long does a 1kg format last?\u003c\/h3\u003e\n\u003cp\u003e At a starting dosage of 5g twice a week for a 150L aquarium, a 1kg package lasts for 100 doses, or approximately 50 weeks. The duration decreases with systems that have high calcium consumption.\u003c\/p\u003e","brand":"Seachem","offers":[{"title":"Default Title","offer_id":38010071941291,"sku":"000116031707","price":49.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0513\/7108\/1899\/files\/81kQq2JsSdL._AC_SL1500.jpg?v=1773604895","url":"https:\/\/reefsolution.com\/en\/products\/reef-advantage-calcium-1kg","provider":"Aquarium ReefSolution inc.","version":"1.0","type":"link"}