| EFFLUENT 
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 
other plastic.
 ELECTROLYSIS
 
(chemical related) 
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.
 END-POINT REACTION 
(chemical related) 
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. 
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