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Thread: filtering time vs pressure

  1. Back To Top    #1

    Join Date
    Mar 2009
    Charlotte, NC

    filtering time vs pressure

    My normal filter pressure is 19-20 psi.
    When I run my Polaris cleaner, the filter pressure drops to 16psi, about a 20% drop.
    Should I increase the total pump run-time by 20% to compensate for this or is turnover not really directly related to pressure?
    19,800 gallons (closed/winter 18,654 gal); plaster; 18x34 Ft kidney bean shape, Depth 3Ft-5Ft. Built 1992
    Pentair Whisper Flow Pump 1HP. Winter safety cover w anchors.
    Sand filter, Pentair Sand Dollar Top Mount Model SD80; Effective Filtration Area 3.5SF
    - FlowRate 75GPM, 8Hr 36,000, 10Hr 45,000, 12Hr 54,000; Pressure Weight 50PSI
    BBB (Hayward Chlorinator when leave town). Polaris 360 cleaner.

  2. Back To Top    #2
    dmanb2b's Avatar
    Join Date
    Apr 2009

    Re: filtering time vs pressure

    I would leave it alone. I psi drop would actually indicate your getting more flow..I think
    24'x52" AGP (13,500 Gallons), Intex SWG, (2)Solar Bear 4x20 panels, Hayward S220T Filter, 1/2hp Pentair Superflo

    Pool School, TFTestKits, Pool Calculator

  3. Back To Top    #3
    Mod Squad Bama Rambler's Avatar
    Join Date
    Jun 2009
    SouthWest Alabama

    Re: filtering time vs pressure

    I agree with Dman, leave it alone. There's nothing magic about 1 turnover. It's just a starting point. Some pools take more than one turnover to remain clear and some take a little less. It's really whatever works for your pool.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

  4. Back To Top    #4
    mas985's Avatar
    Join Date
    May 2007
    Pleasanton, CA

    Re: filtering time vs pressure

    Assuming nothing changed in the return side of the plumbing, a 20% drop in filter pressure is about a 11% drop in flow rate give or take. So running an extra 12% gets you back to where you were but then again, that isn't really going to make much difference anyway.
    Hydraulics 101; Pump Ed 101; Pump and Pool Spreadsheets; Pump Run Time Study; DIY Acid Dosing; DIY Cover Roller
    18'x36' 20k plaster, 1/2 HP 2sp pump, Aqualogic PS8 SWCG, 420 sq-ft Cartridge, Solar, 6 jet spa, 1 HP jet pump, 400k BTU NG Heater, ThePoolCleaner

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