Calcium Hypochlorite is unstabilised (it does not contain cyanurates) and so is more suited for use in indoor pools where chlorine loss through the effects of sunlight are much less.

Calcium Hypochlorite is the preferred method of shock treatment because it is readily soluble and rapidly increases the free chlorine content of the water. Just as importantly the chlorine level drops quickly, especially in strong sunlight, to a level in which bathers can return into the water.

　　Calcium Hypochlorite is ideal for shock dosing as it is a strong oxidising agent. This enables it to destroy combined chlorines, the source of irritation and odour complaints.

　　Calcium Hypochlorite contains 65% available chlorine.

　　38 gm Calcium Hypochlorite will raise the free chlorine level of 25,000 lt water by 1 mg/litre (part per million).

　　Most commonly supplied as a granule, but can be tabletised for use with erosion feeders.