FROG Water Care Experts Glossary of terms

A device in the circulating water line of the pool which provides a constant controlled source of sanitizer, usually in the form of chlorine tablets for the recirculating water.

A lighting system that has light generated at a remote source and transmitted along fibers.

Fine spun filaments of glass which are available in a rope or mat form. When used in a process with polyester resins, catalysts and hardeners, can be formed or molded into pools, spas and related shapes.

A device that is used to filter fine debris out of pool water. Types of filters include Cartridge, DE (Diatomaceous Earth), Regenerative DE, and Sand.

A chemical compound added to the water or to the filter that allows the existing filter to become more efficient. Examples are alum, water clarifiers and D. E.

The length of time between cleaning or backwashing the filter until it has to be done again.

The rate at which the water is traveling through the filter, expressed in U.S. gallons per minute (gpm) per square foot of filter area.

The clump of tuft formed when suspended particles combine with a flocculating agent.

Added to water to coagulate particles that cause haze. See Alum or Clarifier.

The quantity of water flowing past a designated point within a specified time, such as the number of gallons flowing past a point in 1 minute - abbreviated as gpm.

A froth of bubbles on the surface of water. Usually comes from soap, oil, deodorant, hair spray, suntan oil, etc., that is shed into the water as swimmers enter.

Also called Chlorine Residual or Available Chlorine. The amount of active chlorine remaining in the water after the chlorine demand to control algae, bacteria, or other contaminants has been satisfied. Recommendations vary for pool type, pool usage patterns and pool water pH.