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Glossary of Terms

Acid

Chemicals such as Muriatic acid or sodium bisulfate used to lower pH or alkalinity.

Acid Demand

A measure of the amount of acid required to reduce pH to a predetermined level. This can be accomplished by use of an acid titration procedure (Acid Demand Test)

Algae

Microscopic aquatic plant life which can grow on pool surfaces or float freely in the water though harmless to swimmers the presence of algae discolours the water and indicates improper sanitization. Black algae which grows on pool walls and floor can actually crack plaster finish.

Algaecide

A chemical used to kill existing algae or prevent the growth of algae.

Alkalinity

See Total Alkalinity.

Bacteria

Very small organisms continuously entering the water via swimmers, dust, etc. Without proper sanitization pools and spas are a perfect breeding ground for bacteria, many of which can cause disease or infection.

Balanced Water

Water that is neither corrosive nor scaling (in relation to pH, total alkalinity, calcium harness, and temperature factors). The Langelier Index for perfectly balanced water equals zero.

Base

A chemical which raises pH when added to the water, like sodium carbonate or caustic soda.

Base Demand

A measure of the amount of alkali material required to raise pH to a predetermined level. This can be accomplished by use of a base filtration procedure (Base Demand Test).

Bather Load

The number of individuals using a pool or spa in a 24 hour period and the pool and spas principal source of bacterial and organic contamination.

Break Point Chlorination

The process of shocking the water with significant quantities of chlorine to oxidize all contaminants and organic wastes and leave all remaining chlorine as free chlorine.

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