Swimming Pool Glossary
ULTRAVIOLET LIGHT TREATMENT: Using UV wavelength radiation to destroy contaminants in water. UV light is also used to create ozone molecules for the same purpose.
UNDERWATER LIGHT: A light fixture designed to illuminate a pool from below the water's surface.
VACUUM: A device that uses suction to collect dirt from the bottom and sides of a pool. Most common is a vacuum head with wheels that attaches to a pole and is connected to the suction line. Some automatic pool cleaners fall into this category.
VINYL LINER: Also called a Liner. The vinyl membrane that acts as the container to hold the water in one type of pool construction.
VIRUS: A pathogen capable of causing disease.
WASTE GUTTER: The outer channel in a pool with 2 gutters. The inner channel (skimmer gutter) returns the water for filtration, while the outer one collects rain or wash water and diverts it to waste before it can enter the pool.
WATER CLARIFIER: See Coagulant/ Flocculant.
WEIR: Also called a Skimmer Weir. The small floating door on the side of the skimmer over which water flows on its way to the skimmer. The weir prevents debris from floating back into the pool when the pump is off.
ZEOLITE: An alternative to quartz or silica for use in sand filters. It is typically clinoptilolite, the specific zeolite suitable for pool water conditions. Zeolite can provide filtration down to 3 microns, is able to absorb heavy metals such as iron or manganese, and absorbs ammonia and nitrogen compounds. Zeolite can also absorb chloramines and is regenerated by washing in salt. Being less dense than quartz, 60% - 70% of the weight of quartz is used. Zeolite is also claimed to reduce backwashing by 50%.