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November 2008
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Pool Pumps: The 1 HP Rule

The HP rating of the swimming pool pump is most critical in successful operation of the pool and specific accessories. The most common misconception as consumers update pools with aftermarket pumps is that a 2 HP pump is superior to a 1 HP pump. A 2 HP pump will not function with a 300 LB sand filter, a 48 sq ft DE or a 53 square foot cartridge, the most popular builder sizes.
All pumps have a GPM rating as do the filters. A 72 GPM 1 HP pump is the proper rating for the aforementioned filters and a 96 GPM 2HP pump will require at least a 600 lb sand filter or a 72 square feet DE filter.

While subtle issues exist related to the plumbing manifolds (1.5” pipe vs. 2” pipe), total feet of pipe between skimmer and the pump is also a consideration.

The exception to this are accessory water features and in floor cleaning systems, usually new construction issues only. The trend is to incorporate both a separate pump and in many cases a separate filter, always required for more in floor cleaning systems.

Variable flow pumps, “Intelligent” engineering as the manufacturers call it, are now being marketed all through the U.S. mechanical track record and claimed energy savings are nebulous at best.

Two operating issues need to be considered beyond HP and variable speed or flow analysis:
1) The pool must circulate during daylight hours since algae are dormant at night.
2) Timing systems require the pool owner to be able to reprime their pump on occasion or pay for a service call if the pool fails to restart.

Many builders run the pump and filter 24 hours to avoid these issues. This “off peak” circulation adds between $10 and $20 per month to the monthly electric bill at average U.S. rates.

The leading North American swimming pool pump manufacturers are Hayward, Sta-Rite, Pentair, Jandy and Jacuzzi, all with service and parts networks to support their customers.

A pump failing normally overheats (shutting the pool off), trips the breaker or cavities the flow. Normally this gives homeowners some advance warning. The pump consists of an electric motor, wet end and basket. Because rebuilding the motor requires two trips and usually an outside vendor and those two trips, most pool professionals will recommend replacement of the pump, or at least a brand new motor. Do it yourselfers may save half of their money or more with a motor rebuild only. They are unlikely to get the same useful life of replacement.

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