- 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.
- 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.
- Diving Board Diving boards are popular among swimming pool owners, with springboards being a preferred design.
- 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.
- 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.
- 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.
- Dry Acid Dry acid, or sodium bisulfate, is a white crystallized granular substance used to lower swimming pool water pH.
- Delaminating Delaminating, or delamination, refers to a process where a material loses its outer layers through external stress.