{"product_id":"esv-kalkwasser","title":"Kalkwasser — Pure Calcium Hydroxide Powder 14 oz and 3.5 lbs for Top-Off Dosing - ESV","description":"\u003cp\u003eESV Kalkwasser (calcium hydroxide powder) is a proven standard for maintaining calcium concentration and alkalinity in closed marine aquaria. It is one of the very few effective methods that adds calcium and alkalinity with a single product while maintaining pH. Commonly used in conjunction with auto top-off systems.\u003c\/p\u003e\n\u003ch2\u003eHow limewater works\u003c\/h2\u003e\n\u003cp\u003eThe calcium supplied is directly utilized by calcifying organisms (corals, coralline algae). The hydroxide ions readily convert dissolved CO2 into bicarbonate and carbonate ions — also directly used by calcifying organisms. That double action is what makes kalkwasser a complete single-product method.\u003c\/p\u003e\n\u003ch2\u003eCertified purity\u003c\/h2\u003e\n\u003cp\u003eESV calcium hydroxide is extremely pure and meets American Water Works Association and Water Chemical Codex requirements.\u003c\/p\u003e\n\u003ch2\u003eDosing\u003c\/h2\u003e\n\u003cp\u003eESV does not publish a dosing chart on its product page. If you see a number elsewhere, it doesn't come from the manufacturer. Kalkwasser is commonly dosed through auto top-off water — write to us with your tank volume and calcium demand and we'll guide you.\u003c\/p\u003e\n\u003ch2\u003eTwo sizes\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003e14 oz (400 g)\u003c\/strong\u003e — the small jar, to get started or for small tanks.\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003e3.5 lbs (1600 g)\u003c\/strong\u003e — the big jar, four times the powder for hungry systems.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWhy buy at ReefSolution\u003c\/h2\u003e\n\u003cp\u003eMarine aquarium specialists in Laval: in-store advice and shipping across Canada. From the same ESV family:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/en\/products\/esv-b-ionic-calcium-buffer-2x16-oz\"\u003e\u003cstrong\u003eB-Ionic Calcium Buffer 2×16 oz\u003c\/strong\u003e\u003c\/a\u003e — the liquid two-part calcium + alkalinity system.\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/en\/products\/esv-liquid-carbonate-buffer\"\u003e\u003cstrong\u003eLiquid Carbonate Buffer\u003c\/strong\u003e\u003c\/a\u003e — liquid alkalinity buffer.\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/en\/products\/esv-calcium-chloride-800-g\"\u003e\u003cstrong\u003eCalcium Chloride 800 g\u003c\/strong\u003e\u003c\/a\u003e — to raise calcium on its own.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eFrequently asked questions\u003c\/h2\u003e\n\u003ch3\u003eWhat is kalkwasser?\u003c\/h3\u003e\n\u003cp\u003e\"Limewater\": calcium hydroxide dissolved in fresh water. Dosed into the aquarium, it adds both calcium and alkalinity with a single product while maintaining pH.\u003c\/p\u003e\n\u003ch3\u003eHow do I dose ESV kalkwasser?\u003c\/h3\u003e\n\u003cp\u003eESV does not publish numbered directions on its product page. The common practice described by the manufacturer is to use it with an auto top-off system. Write to us for a dosage suited to your tank.\u003c\/p\u003e\n\u003ch3\u003eIs ESV kalkwasser pure?\u003c\/h3\u003e\n\u003cp\u003eYes — ESV calcium hydroxide meets American Water Works Association and Water Chemical Codex requirements.\u003c\/p\u003e","brand":"ESV","offers":[{"title":"14 oz (400 g)","offer_id":47580645753003,"sku":"ESV101","price":24.99,"currency_code":"CAD","in_stock":false},{"title":"3.5 lbs (1600 g)","offer_id":38010829897899,"sku":"ESV102","price":39.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0513\/7108\/1899\/files\/s426466402475081898_p36_i3_w800.jpg?v=1707777994","url":"https:\/\/reefsolution.com\/en\/products\/esv-kalkwasser","provider":"Reef Solution","version":"1.0","type":"link"}