Swimming Pool Terms Glossary
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Underwater Light A light fixture designed to illuminate a pool or spa from beneath the water’s surface.
Vacuum This term can be used to define any number of devices that use suction to collect dirt from the bottom and sides of a pool or spa. Most common is a vacuum head with wheels that attaches to a telepole and is connected to the suction line usually via the opening in the skimmer. It must be moved about by a person and debris is collected in the filter. Other vacuum type cleaners are listed under automatic pool cleaners.
Vacuum filtration One of the oldest types of filtration in use. A filtration process where a partial vacuum is applied to increase the rate of filtration by causing the liquid (water) to be sucked through the filter medium.
Valve A mechanical device installed in a water line to close off or regulate the flow of water.
Velocity The speed at which a liquid flows between two points. Usually measured in feet per second.
Venturi A fitting or device that consists of a tube constricted in the middle and flared on both ends. A fluid's velocity will increase and a fluid's pressure will decrease while passing through the constriction. Placing a tube or pipe at the constriction point creates a vacuum. Fluid or air can then be drawn in through the tube. A hydro-therapy jet draws air in and mixes it with the water using this principal.
Vinyl liner The vinyl membrane that acts as the container to hold or contain the water.
Volume The amount of water a vessel will hold. It is a three-dimensional space occupied by an object.
Formula for volume is: Length × Width × Average Depth = cubic feet. Then, cubic feet × 7.5 gallons per cubic foot = gallons in vessel.
Volute A spiral casing for a centrifugal pump designed so the pump rotation will be converted to pressure in a smooth transition as the water leaves the impeller and is discharged from the pump.
Vortex A revolving mass of water that forms a whirlpool. A funnel-shaped opening is created downward from the water surface.
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