General Terms
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acid
A liquid or dry compound used to reduce the pH of swimming pool or spa water. See Sodium bisulfate.
algae
Microscopic plant-like organisms that contain chlorophyll. Algae are nourished by sunlight (carrying out photosynthesis). They are introduced by rain and wind and grow in colonies, producing nuisance masses. These organisms include green, blue-green or black, brown, and yellow-green (mustard) algae. Pink/red colored algae-like organisms exist but are bacteria and not algae. There are 21,000 known species of algae.
algaecide
A natural or synthetic substance used for killing, destroying, or controlling algae (also spelled Algicide).
alkalinity
The amount of bicarbonate, carbonate, or hydroxide compounds present in water solution. See also Total Alkalinity.
alum (aluminum sulfate)
An aluminum sulfate compound used to cause suspended solids in the water to congeal into filterable masses (flocculate).
available chlorine
A term used in rating chlorine-containing products as to their total oxidizing power (also see free available chlorine).
backwash
The process of thoroughly cleansing the filter medium and/or elements by the reverse flow of water through the filter.
breakpoint chlorination
The addition of a sufficient amount of chlorine to water to destroy the combined chlorine present in the water. Generally considered to be 10 times the free available chlorine (FAC) level currently measured.
broadcast
A method of putting granular or powdered chemicals into a pool by spreading them widely over the surface of the water.
bromine (Br2)
A chemical element that exists as a liquid in its elemental form or as a part of a chemical compound which is an oxidant and a biocidal agent used to disinfect pool or spa water.
Pool School
Take your pool management skills to the next level with our Certified Pool Operator (CPO)® training, a comprehensive, 14-16 hour course designed to equip you with the essential knowledge for effective pool and spa operations. Authorized by the Pool and Hot Tub Association (PHTA), this program covers water chemistry, testing, filtration, maintenance, and regulatory compliance. Upon completion, participants earn a five-year CPO® certification, recognized industry-wide.
Pool School
Take your pool management skills to the next level with our Certified Pool Operator (CPO)® training, a comprehensive, 14-16 hour course designed to equip you with the essential knowledge for effective pool and spa operations. Authorized by the Pool and Hot Tub Association (PHTA), this program covers water chemistry, testing, filtration, maintenance, and regulatory compliance. Upon completion, participants earn a five-year CPO® certification, recognized industry-wide.
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