Pool Info: Pool Glossary - Page 8
Pool Glossary (cont.)
RATE OF FLOW: Quantity of water flowing past a designated point within a specified time period, measured in gallons per minute (gpm).
RESIDUAL: Usually refers to free available chlorine levels remaining in the pool after initial treatment or activity with contaminants.
SAND FILTER: A filter tank, usually fiberglass or ABS plastic, filled with sand and gravel. The pump diffuses water over the top of the sand bed, and forces it through the sand and into the laterals on the bottom.
SCALE: Usually whitish in color, scale forms on pool surfaces and equipment when mineral salts are forced out of solution. A scaling condition is one in which calcium hardness, pH and/or alkalinity levels are out of balance.
SEQUESTERING AGENT: A sequestering agent ties-up minerals tightly in solution, preventing their precipitation, which colors the water and/or stains the pool. Synonymous to chelators, these are commonly called stain & scale chemicals.
SKIMMER: A surface skimmer is a plumbing fitting set at water level, containing a weir mechanism and a debris basket. The skimmer is part of the suction side circulation system.
SKIMMER BASKET: Beneath the lid, the basket strains debris, as the first line of defense in filtering the water.
SKIMMER NET: Attached to a telescopic pole, a leaf rake is a very useful tool in keeping the pool clean. Also called a skimmer net are the flat, "dip and flip" nets, which aren't so useful.
SHOCK: As a noun it loosely describes the products used in shocking, such as hypochlorites, potassium permonysulfate or hydrogen peroxide. As a verb it describes the act of bringing the sanitizer level up so high that breakpoint chlorination is reached. When breakpoint is reached, a "shock" or perhaps a "lightning bolt" is a better analogy, is sent through the water, tearing apart molecules and slashing through cell walls. Ultimate purification, man.
SNOWBELT: The northern half of the United States where freezing temperatures are particularly common.
SODA ASH: A base, used to counteract an acidic condition by raising pH.
SODIUM BICARBONATE (baking soda): Another base, however its properties will increase alkalinity more than pH. Used to raise Total Alkalinity levels.
SODIUM BISULFATE: An granular form of acid, used to counteract a scaling condition by lowering pH and/or alkalinity.
SODIUM HYPOCHLORITE: Liquid chlorine used in pools, identical yet stronger than Clorox bleach.
SODIUM TETRABORATE: New technology that renders algae incapable of processing carbon dioxide, which they need to live.
SODIUM DICHLOR: A granular form of chlorine that is stabilized with cyanuric acid. Used for shocking and super-chlorination.
SOFT WATER: Water that has low calcium and/or magnesium content. Soap lathers easily in soft water.