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Glossary 
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ACID
a liquid or dry compound used to reduce the pH of swimming pool or spa water. See also "muriatic acid" and "sodium bisulfate".
ACID DEMAND
the amount of acid (or pH decreaser) water needs to reach the proper pH range. For example, to lower pH from 8.0 to 7.6, your pool may "demand" 2 quarts of acid. The actual amount needed will be dependent upon pool volume and other factors. Some test kits contain the titration test used to determine acid demand.
ALGAE
microscopic plant-like organisms that contain chlorophyll (green coloration) and are nourished by sunlight and carbon dioxide. Rain and wind can introduce algae to pools, where it is capable of rapid reproduction. There are 21,000 known species of algae, but only a few are known to grow in pools such as green, blue-green or black, brown and yellow-green (mustard). Algae blooms may form separate spots, or seem to grow in sheets. See also "green algae", "yellow algae", "black algae", "pink algae"
ALGAECIDES/ALGICIDES
natural or synthetic substances used for killing, destroying, or controlling algae. Algaecides perform best when used regularly as part of a normal maintenance program along with a routine sanitization program. A variety of algae treatment products are available including polymers, quat compounds, chlorine enhancers, copper and silver compounds, and herbicides.
ALKALINITY
See Total Alkalinity
ALUM
short for aluminum sulfate, this powdered substance is used as a flocculent to attract suspended particles in the water together so they sink and can then be vacuumed. It is used to clear cloudy water. A small amount of alum is occasionally used as a sand filter additive.

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