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Swimming pool filtering system

  • US 4,545,906 A
  • Filed: 08/02/1983
  • Issued: 10/08/1985
  • Est. Priority Date: 10/30/1975
  • Status: Expired due to Fees
First Claim
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1. A pool water filter system of the type wherein a closed water circulation path is provided having an inlet for receiving water from a pool and an outlet for discharging water into a pool at a point below the normal water level, said path including a centrifugal liquid pump and a filter between the inlet and outlet, said water circulation path having flow characteristics defining a system head curve that is variable depending upon the cleanliness of the filter when said water circulation path is primed with water, a motor is closely coupled to said pump for driving said pump at a first speed at which speed said pump is capable of developing a maximum pump head Hmax and a minimum pump head Hmin, the actual pump head and water flow rate being determined by the instantaneous system head curve, said first speed sufficient to provide pump heads and water flow rates for priming said system, vacuuming and rapidly cleaning up after a storm, wherein the improvement comprises:

  • said motor being capable of operating at a second speed lower than said first speed for driving said pump to provide an energy efficient low water circulation rate through said circulation path in accordance with the instantaneous system head curve, said second speed providing a maximum pump head less than Hmax minus Hmin ; and

    switch means for selecting one of said first and second motor speeds to thereby achieve a water circulation rate in accordance with the instantaneous system head curve.

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