The Balling method is a technically mature procedure, tested and proven a thousand times, to resupply your sea water aquarium with the used-up calcium and hydrogen carbonate ions at a low cost!
Calcium chloride-dihydrate (CaCl2 • 2H2O)
Calcium chloride is an irritant and care should be taken to prevent it from getting into your eyes or respiratory tract. Keep this chemical out of reach of children.
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