The process of thoroughly cleansing the filter medium and/or elements by the reverse flow of water through the filter.

The addition of a sufficient amount of chlorine to water to destroy the combined chlorine present in the water. Generally considered to be 10 times the free available chlorine (FAC) level currently measured.

A method of putting granular or powdered chemicals into a pool by spreading them widely over the surface of the water.

A chemical element that exists as a liquid in its elemental form or as a part of a chemical compound which is an oxidant and a biocidal agent used to disinfect pool or spa water.