Quick Definition:

Calcium hypochlorite is commonly called shock in swimming pool industry terms, as is used to rapidly sanitize pool water by oxidizing all contaminates in the water.

What is Calcium Hypochlorite for swimming pools?

Calcium hypochlorite, more commonly called chlorine-based shock, is a chemical compound used as a sanitizing and disinfecting agent of water.  In swimming pools, the product is commonly used and recommended for disinfection and sanitation. The product is unstabilized since it doesn’t contain cyanurates and is therefore more suitably used in indoor swimming pools. To reduce chlorine loss due to UV radiation in outdoor pools, it is can be mixed with a stabilizer such as cyanuric acid, or applied to the pool water at or after sunset.

Calcium hypochlorite contains calcium, and will tend to harden the swimming pool water.  This could lead to scaling on pool surfaces and equipment.  However, the fact that it is readily soluble makes it the preferred agent for shock treatment, dissolving quickly to oxidize all organic and inorganic contaminates in the swimming pool water.

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