Calcium Carbonate (Calcite) Blocks

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Active Ingredients: Calcium Carbonate (99.3% Purity, Limestone). Bound by gelaltin (pork derived). Place in HOB filter to dissolve over time, raising your tank's general hardness o r carbonate hardness (GH and KH).It's recommended to use these along with a GH/KH kit to ensure your tank remains within stable parameters. For anyone restricted from using porcine derivatives, email [email protected] for non-porcine derived options. A custom invoice can be created for you. Show more