Check the listing for details. ESV Kalkwasser Powder (Calcium Hydroxide) 22 lbs. Condition: New. Listed at 174.75 USD. Calcium Hydroxide is a proven standard for maintaining calcium _x000D_ concentration and alkalinity in closed marine aquaria. The calcium _x000D_ provided is directly used by calcifying organisms, and the hydroxide _x000D_ ions provided readily convert dissolved CO2 into bicarbonate and _x000D_ carbonate ions, which are also directly used by calcifying organisms. _x000D_ Our product is extremely pure and meets American Water Works Association_x000D_ and Water Chemical Codex requirements.
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