Food grade calcium chloride (Calcium chloride-dihydrate, CaCl2-2H2O) for maintaining and raising calcium level in reef aquariums by Balling method. Calcium supplement is important in reef aquariums with shell forming life forms like stony corals and invertebrates.

Calcium chloride and Calcium chloride-dihydrate have the same effect in reef aquariums, the difference is that calcium hydrate contains water molecules. The higher is the hydrate value, the higher is the number of water molecules; di-hydrate contains two water molecules.

NOTE! Calcium is consumed by aquarium life, while the chloride part is not. This will eventually increase the chloride concentration in the aquarium water, which can be avoided by using sodium chloride free aquarium salt mixture in water changes once in a while OR by doing a major water change once a year. A large annual water change will both restore the levels of all important sea water components and remove hazardous element concentrations.

Sold by weight; 1 piece = 1 kg.