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What is kalkwasser?

Kalkwasser

kalkwasser is literally chalk-water, this is water with calcium hydroxide Ca(OH)2 dissolved in it. Adding kalkwasser is the best way to maintain calcium levels in marine tanks growing corals, clams, and calcareous algae. About 1 teaspoon of Ca(OH)2 powder will dissolve in a gallon of pure water.

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