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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.
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 principle.
VINYL LINER The vinyl
membrane that acts as the container to hold or contain the water.
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