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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.