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Swimming pool filtering system

  • US 4,421,643 A
  • Filed: 09/29/1978
  • Issued: 12/20/1983
  • Est. Priority Date: 10/30/1975
  • Status: Expired due to Term
First Claim
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1. A swimming pool filter system, comprising:

  • a closed water circulating system having an inlet for receiving water from said pool and an outlet for discharging water into said pool at a point below the normal water level;

    a filter connected in said closed water circulating system for filtering pool water, said filter and closed water circulating system defining a variable system head curve dependent upon the particular condition of said filter when said water circulating system is primed with water;

    a centrifugal liquid pump connected in said closed water circulating system;

    a motor closely coupled to said pump, said motor being capable of operating at at least two speeds for driving said pump to produce at least two different pool water circulation rates through said water circulating system in accordance with the instantaneous system head curve for a water primed system, one of said motor speeds being sufficiently high to produce a head that will prime the water circulating system, the other of said motor speeds being lower than said one speed and sufficient to provide a low water circulation rate through said water circulating system but not to prime said system; and

    switch means for selecting a motor speed to thereby achieve a water circulation rate in accordance with the system head curve so that the most efficient circulation rate required to maintain a desired degree of pool water clarity may be selected thereby providing a more efficient filter system and for selecting said one speed when the water circulating system must be primed.

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