Etching
Etching is a problem encountered by pool owners with low calcium hardness or pH, where the pool water becomes corrosive to concrete, stone, or metal surfaces exposed to the pool water.
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Electronic Chlorine Tester
Electronic chlorine testers are available that can test chlorine levels in swimming pools easier and just as accurately as other test methods.
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Electric Pool Heater
Electric pool heaters are used to heat swimming pool water, and use electricity as their main source of heating.
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DPD Test
A DPD test is a swimming pool water test which measures the oxidizer level in the pool water, such as free and total chlorine, bromine, and ozone.
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DPD Reagent
A DPD reagent is the general term for DPD-1, a reagent used to test swimming pool free chlorine, bromine, and chlorine dioxide.
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Diving Board
Diving boards are popular among swimming pool owners, with springboards being a preferred design.
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Dichlor
Dichlor is a shortened term for dichloroisocyanuric acid, which sodium dichloroisocyanurate is produced for swimming pool sanitation products, and releases hydrochloric acid into the pool water as a chlorination method.
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Diatomic Earth (DE)
Diatomic earth, or DE, can be used as a filter medium for swimming pools, as its inert chemical properties yet effective filtering ability can benefit swimming pool water quality.
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DE Filter
A DE filter can be used for swimming pools and can clarify pool water of particles that normally pass through other filtration methods.
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Cyanuric Creep
Cyanuric creep describes the tendency for the cyanuric acid level to rise over time in swimming pool water.