A liquid or dry compound used to reduce the pH of swimming pool or spa
water. See also "muriatic acid" and "sodium bisulfate".
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
AIR-RELIEF VALVE A brass
or plastic, manually operated valve located at the top of a filter tank for
relieving the pressure inside the filter and for removing the air inside the
filter (called bleeding the filter). Sometimes called a pressure-relief valve.
Microscopic plant-like organisms that contain chlorophyll. Algae are nourished
by carbon dioxide (CO2) and use sunlight to carry out photosynthesis. It is
introduced by rain or wind and grows in colonies producing nuisance masses.
Algae are not disease-causing, but can harbor bacteria, and it is slippery.
There are 21,000 known species of algae. The most common pool types and black,
blue-green, green and mustard (yellow or drawn). Pink or red-colored algae-like
organisms exist but are bacteria and not algae. Maintaining proper sanitizer
levels, shocking and super chlorination will help prevent its occurrence.
Also called algicide - A natural or synthetic chemical designed to kill, destroy
or control 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.
A substance that retards and prevents the growth of algae.
Also called base - A Class of compounds which will react with an acid to give a
salt. Alkali is the opposite of acid.
(chemical related) Also more commonly called
total alkalinity. A measure of the pH-buffering capacity of water. Also called
the water's resistance to change in pH. Composed of the hydroxides, carbonates
and bicarbonates in the water. One of the basic water tests necessary to
determine water balance.
Any one of several aluminum compounds used in pools to form a gelatinous floc on
sand filters or to coagulate and precipitate suspended particles in the water.
Introduced into the water by swimmers as waste (perspiration or urine) or by
other means. Quickly forms foul-smelling, body- irritating chloramines - a
disabled, less- effective form of chlorine. See chloramines or combined
A chemical added to the water to make the suds or foam go away. These products
do not remove the source of the sudsing. Most often, the water must be drained
and refilled to remove the soaps, oils and other causes of foaming. Shocking and
super chlorination may help prevent foaming.
A chemical compound used to remove iron stains from fiberglass and vinyl-liner
Stands for 'American Societyof Mechanical Engineers'. Most local codes require
that public pools be in compliance with ASME standards and be inspected by ASME
inspectors when manufactured. ASME approved heaters carry the ASME stamp on the
AUTOMATIC POOL CLEANER A
pool maintenance system that will agitate or vacuum debris from the pool
AVAILABLE CHLORINE CONTENT
A term used or an index used to compare the oxidizing power of
chorine-containing products to gas chlorine. It permits easy comparison of
The amount of chlorine, both free and combined in the pool water that is
available to sanitize or disinfect the water. Some- times called residual