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Glossary

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
 

Effective Filter Area (EFA): Total surface area through which water flow rate will be maintained during filtration. EFA is different for the various types of filters: Cartridge: EFA is the cartridge area that is exposed to the direct flow of water. Diatomaceous Earth (DE): EFA is the area of the septum. Available in 25 lb bags. Permanent-Medium: EFA is the filter surface that is perpendicular to the flow direction. Sand: EFA is the area of the sand within the filter.

Efficacy: The power to produce an effect. Chlorine's efficacy is affected by many factors, including the sun, water balance and the pool water's chlorine demand.

Effluent: The output stream exiting the pool system, pool filter or other device.

Enzymes: Used in swimming pool formulations designed to break down and digest oils in a pool or spa.