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  • Pool Care Terms
Term Definition

The amount of calcium and magnesium dissolved in water; measured by a test kit and expressed as parts per million (ppm) of equivalent calcium carbonate.

Hydrochloric acid (HCI)

Also called Muriatic acid when diluted. A very strong acid used in pools or spas for pH control and for certain specific cleaning needs. A by-product of the addition of chlorine gas to water. Use extreme caution in handling. See also Muriatic acid.

Hypochlorious acid (HOCl)

The most powerful disinfecting form of chlorine in water.


A family of chemical compounds, including Calcium hypochlorite, Lithium hypochlorite. Sodium hypochlorite, etc., found in various forms for use as a chlorine carrier in pool and spa water.

Pool School

CPOThe Certified Pool Operator (CPO) training is designed to provide individuals with the basic knowledge, techniques, and skills of pool and spa operations.

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