{"product_id":"kalkwasser-medical-grade-calcium-hydroxide-balanced-method-to-maintain-calcium-and-alkalinity-in-a-reef-tank","title":"Kalkwasser, Medical Grade Calcium Hydroxide, Balanced Method to Maintain Calcium and Alkalinity in a Reef Tank","description":"\u003ch3\u003ePerfect Corals Kalkwasser — Medical Grade Calcium Hydroxide\u003c\/h3\u003e\n\n\u003cp\u003eTransform Your Tank with the Simplest Two-Element Dose\u003c\/p\u003e\n\n\u003cp\u003eLooking for a reliable, low-maintenance way to keep calcium and alkalinity in check without juggling a two-part system every day? Kalkwasser has been a reef tank staple for decades — and for good reason. It's one of the most cost-effective dosing additives available, and when dialed in correctly, it handles calcium and alkalinity simultaneously while giving your pH a natural lift.\u003c\/p\u003e\n\n\u003cp\u003ePerfect Corals sources medical grade calcium hydroxide, meaning you're getting a high-purity powder free from the contaminants that can sneak into lower-grade formulations and wreak havoc on your reef chemistry. Whether you're running an ATO reservoir, a dosing pump, or a dedicated kalkwasser reactor, this dissolves cleanly into RO\/DI water and delivers a stable, saturated solution to your saltwater aquarium. The result is a balanced method that supports coral calcification, maintains carbonate alkalinity, and keeps your pH from drifting low — especially effective when dosed overnight during the pH trough.\u003c\/p\u003e\n\n\u003ch3\u003eQUICK STATS \u0026amp; DOSING GUIDE\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDetails:\u003c\/strong\u003e Medical grade calcium hydroxide (Ca(OH)₂); high-purity dry powder\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDosing instructions:\u003c\/strong\u003e Mix ½ tsp to 2 tsp per gallon of RO\/DI water; stir lightly and allow to settle 20–30 minutes before use. Start low and adjust in ½ tsp increments based on tank demand. Target pH 8.3–8.4; never exceed 8.5. See full dosing guide below for ATO, dosing pump, and reactor methods.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eForm:\u003c\/strong\u003e Fine dry powder\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShelf life:\u003c\/strong\u003e Store sealed, dry, and away from CO₂ exposure to preserve potency\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBest for:\u003c\/strong\u003e Reef tanks needing balanced calcium and alkalinity maintenance with minimal equipment; ideal complement to ATO systems\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Compatible with all marine aquarium setups; can be used with ATO reservoirs, dosing pumps, or kalkwasser reactors\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWHY BUY FROM THE CORAL BOUTIQUE?\u003c\/h3\u003e\n\n\u003cp\u003eAt The Coral Boutique, we don't stock products we haven't vetted — kalkwasser is a foundational part of how many of us here manage our own reef tanks, and medical grade purity is non-negotiable. When you buy from us, you're getting the same additive we trust in our own systems.\u003c\/p\u003e","brand":"Perfect Corals","offers":[{"title":"2.25 lbs","offer_id":54656756252947,"sku":"sku-42417943838816","price":19.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0954\/3647\/2595\/files\/36.png?v=1788573743","url":"https:\/\/thecoralboutique.com\/products\/kalkwasser-medical-grade-calcium-hydroxide-balanced-method-to-maintain-calcium-and-alkalinity-in-a-reef-tank","provider":"The Coral Boutique","version":"1.0","type":"link"}