Glossary Terms

free mineral acidity (see mineral acidity).

A self-closing valve designed to release a large volume of water when tripped.

A tank or chamber in which water is stored for rapid release.

The addition of a fluoride compound to a water supply for the reduction in incidence of dental caries (tooth decay) in children.

The quantity of water or regenerant which passes a given point in a specified unit of time, often expressed in gallons per minute.

A device designed to limit or restrict the flow of water or regenerant; may include a throttling valve, an orifice of fixed diameter, or a pressure […]

The process of causing a “floc” to form after treatment with a coagulant by gentle stirring or mixing. (See coagulation.)

A very fine, fluffy-type mass formed by the coming together of a number of fine suspended particles.

An arbitrary unit assigned to different types of plumbing fixtures, and used to estimate flow rate requirements and drain capacity requirements.