The water that flows out of a pump, filter or heater, usually on its way back to
the pool or spa.
ELBOW A plumbing fitting
shaped at a 90 degree or a 45 degree angle usually made of metal, PVC or some
An electrochemical reaction causing a black stain normally found around metal
fixtures or on the plaster. It is caused by two dissimilar metals being plumbed
together or from an improper electrical grounding of pool equipment or lights.
Electrolysis also means the decomposition of water and other inorganic compounds
in aqueous solution by means of electricity. Chlorine generators use this
principle to produce chlorine from salt in the water.
The resulting color change in a test sample created when you add drops of a
given reagent. The number of drops correlates with a measurement. (also
see Titration test)
EPA Abbreviation for the
federal Environmental Protection Agency.
ESCUTCHEON PLATE An
ornamental shield, flange or border used around a pie, plumbing fitting, grab
rail or light.