Calcium Hypochlorite – A compound of chlorine and calcium used as a disinfectant, sanitizer, bactericide, algaecide and oxidizer in swimming pool and spa water. It is available as a white granular material usually used for super chlorination or it is available as tablets used in a feeder for regular chlorination. It usually contains 65% available chlorine.
Calcium Carbonate – Crystalline compounds formed in swimming pool and spa water when the calcium, pH and total alkalinity levels are too high. Once formed, the crystals adhere to the plumbing, equipment, pool walls and bottom. These crystals are better known as scale.
Calcium Chloride – A soluble white salt used to raise the calcium or total hardness level in the pool or spa.
Calcium Hardness – The calcium content of the water. Calcium hardness is sometimes confused with the terms water hardness and total hardness. Too little calcium hardness and the water is corrosive. Too much calcium hardness and the water is scale forming. One of the basic water tests necessary to determine water balance. Minimum level is 150 ppm. Ideal range is 200 to 400 ppm.
Cancelation Notice – In most states a consumer has three business days to cancel a home improvement contract if that contract is signed in the home of a buyer.
Cartridge – A replaceable porous element made of paper or polyester used as the filter medium in cartridge filters.
Cartridge Filter – A pool or spa water filter that uses a replaceable porous element made of paper or polyester.
Cascade – A water feature streaming out from a wall of raised bond beam or raised spa.