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Pool Pumps
Some pool pumps have two motor speeds to reduce power consumption at times when full power is not needed. Other pump manufacturers (typically Italian or other European) have redesigned their units to use a smaller electric motor with heavier windings, therefore consuming less energy, to power a larger pump impeller. Variable-speed pumps reduce power consumption even more. Popular in the United States, these pumps run slowly 24 hours a day. The slow speed typically cleans better because smaller particles can be filtered. At the slow speed, minimal resistance in the pipes reduces the energy needed to move the water.
Pool pumps typically are "self priming": they may be positioned above the mean water level of the pool yet still start up and function after a timed rest period. Pumps that do not "self prime" are termed "flooded suction" and must be gravity fed by the pump by being located below the mean level of the pool water.
Most pool pumps available today incorporate a small filter basket termed a "hair and leaf strainer" to avoid leaf or hair contamination reaching the close-tolerance impeller section of the pump.
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