calcium chloride

Calcium chloride is the source of calcium in nearly all 2 and 3 part calcium and alkalinity addition systems, and all individual calcium supplements.

The dihydrate just means that there are two water molecules in the solid crystal structure for each CaCl2.

There are many sources (Dr Foster and Smith, BRS, amazon, etc., and any food or pharmaceutical grade is fine, and many lower grades may also be fine, just not tested and checked for purity (e.g., Dowflake). :)
 

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