Glossary Terms

The concentration of residual chlorine which is combined with ammonia (NH3) and/or organic nitrogen in water as chloramines (or other chloro derivative) yet is still available […]

The process in which the solution to be treated is passed through a bed, or column (as in a tank), of filter media or ion exchanger; […]

The discharge of color to the effluent of a filter or ion exchange system by any component. It usually occurs after a period of standing which […]

The shade or tint imparted to water by substances in true solution, and thus not removed by mechanical filtration; most commonly caused by dissolved organic matter, […]

See heterotrophic plate count.

Very finely divided solid particles which do not settle out of a solution. The removal of colloidal particles usually requires coagulation.

A device or system designed to collect backwash water from a filter or ion exchange bed. May also be used as an upper distributor to spread […]

A particular group of bacteria primarily found in human and animal intestines and wastes. These bacteria are widely used as indicator organisms to show the presence […]

The abbreviation for “Chemical Oxygen Demand”.