PLASTER: A common type of interior
finish applied over the concrete shell of an in ground swimming
pool.
PRESSURE GAUGE: A device indicating
pressure in a filter system. Provides a determination of how
the system is operating, and informs us when service is required.
PRESSURE SIDE: The return side
of the plumbing. The section from the pump impeller towards the
pool.
PRESSURE SWITCH: A switch used
in pool heaters which opens when the flow rate is insufficient
for safe heater operation. This disrupts the circuit in the heater,
preventing it from firing.
PLUNGER: The sliding disc assembly
that changes valve position in a push-pull valve. For example;
up for backwash, down for filtration.
PUSH-PULL VALVE: A two position
valve used for backwashing sand or DE filters.
PUMP: A mechanical wet-end, powered
by an electric motor, which causes hydraulic flow and pressure
for the circulation of the pool water.
PVC: Polyvinyl chloride, which
is used to make flexible and rigid PVC pipe used for pool plumbing.
RATE OF FLOW: Quantity of water
flowing past a designated point within a specified time period,
measured in gallons per minute (gpm).
RESTRICTED FLOW: The term used
to describe a condition preventing full flow of water. Restriction
can occur with full skimmer or strainer baskets, obstructions
in the plumbing, dirty filter, undersized plumbing or equipment,
or placing devices like, heaters, cleaners or fountains in the
circulation system. Restriction on the suction side creates higher
vacuum, (or suction) while on the pressure side creates higher
pressure.
RE-BAR: Reinforcement bar, used
to add strength to a concrete. After excavation of an in ground
pool, a steel cage is formed out of re-bar, and the gunite shell
is shot over and surrounding it.
