Refers to volatile, combustible and sometimes biodegradable chemical compounds
containing carbon atoms bonded together with other elements. The principal
groups of organic substances found in water are proteins, carbohydrates, fats
and oils. See organic waste.
Also called swimmer or bather waste - All of the soap, deodorant, suntan lotion,
lipstick, makeup, cologne, body oils, sweat, spit, urine, etc., brought into the
water. They also form chloramines, which are foul-smelling and body irritants.
Requires large amounts of chlorine or non-chlorine shock to destroy.
An abbreviation for oxidation reduction potential. It is a measurement of a body
of water's ability to oxidize contaminants. Measured with an electrode and an
electronic meter. It is an indication of the sanitizing level or degree of
safety from disease in the water. Measured in millivolts with the accepted
minimum level being 650 mV (millivolt).
Abbreviation for orthotolidine. A chemical reagent used to test the total
chlorine level in pool and spa water. It does not measure free available
chlorine. See DPD.
An incorrect term used to describe water that is acidic or water that has a pH
lower than 7.2.
OVER-DRAIN Also called a
diffuser or distributor - An internal sand filter device that evenly distributes
influent pool water over the sand filter bed.
To rid the water of ammonia, nitrogen com- pounds and swimmer waste (organic
compounds). These organic compounds disable chlorine, are body irritants and
have a foul smell. Removal is accomplished by super chlorination or by shock
treating with a non-chlorine oxidizer.
A non-chlorine shocking compound that removes or destroys built-up contaminants
and chloramines in pool water without raining chlorine levels as required when
A gaseous molecule comprised of 3 atoms of oxygen. It is generated on site from
air oxygen and used for oxidation of water contaminants.