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We want to help you make informed
decisions before you buy. We do not promote one brand or product. We
want to educate and inform the general public of the large
selection of swimming pool supplies available to them today. Years
ago swimming pool owners did not have as many options available.
 Find swimming pool terms and their meanings here:
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( sorry no other terms found for the letters x, y or z )
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Dechlorination
Sometimes, either as a result of accidental over chlorination,
it is necessary to lower the chlorine level of pool water. This
is achieved by treatment with either Sodium Thiosulphate or
Hydrogen Peroxide. As an example for each 1 p.p.m. (mg.l)chlorine
in 45,000 litres there will be 450gm chlorine. For each gram of
chlorine add 2gm Sodium Thiosulphate or 1.5gm 30% Hydrogen
Peroxide.
Defoamer
See antifoam
Dichlor
A commonly used name for Sodium Dichloroisocyanurate Dihydrate.
This is a very common granular form of stabilized chlorine donor
giving about 55% available chlorine. In solution it
disassociates into Hypochlorous Acid, which sanitizes and
cyanuric acid which stabilizes chlorine.
Disinfection
A chemical or other treatment used to destroy pathogenic
organisms.
DPD
The indicator usually used in tablet form which measures
chlorine and bromine levels in pool and spa water. DPD is an
abbreviation for Diethyl-p-Phenylene Diamine.
DPD1 tablets are used for measuring free chlorine. DPD3 tablets
are for total chlorine.
See also Bleaching Out.
Dry Acid
A powdered chemical such as Sodium Bisulphate or Sulphamic Acid,
which is acidic in nature when dissolved in water. Used to lower
pH these are sold as pH Decrease or pH Minus.
Dry Chlorine
A term sometimes used to describe Calcium Hypochlorite or
Dichlor
See how to use these materials.
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