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Deep Areas:
Water depths of 5 feet or more.
Diatomite:
The all-natural filter medium, made of powdered microscopic fossil skeletons and plankton, found in diatomaceous earth (DE) filters. Available in 25 lb bags.
DiChlor:
Stabilized granular chlorine with 56% available chlorine and pH of 6 used as an easy way to add chlorine to outdoor pools where the stabilizer resists the chlorine loss caused by sunlight. Available in 10, 25, 50 and 100 lb. divisions.
Disinfectant:
Pool chemicals that kill undesirable (pathogenic) organisms. Examples are chlorine, bromine, ionizers and copper/silver algaecides.
Diverter Valve:
Used in a twin port skimmer, a diverter allows the operator to manipulate the amount of flow from the main drain and skimmer to the pool pump.
DPD Test::
This is a testing method for measuring the amount of bromine, free chlorine and total chlorine.
Dry Acid:
A granular product which lowers pH and total alkalinity of pool war which is also referred to as Sodium Biosulfate.