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Thread: PSI for in ground pool

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    PSI for in ground pool

    Hi need help having trouble with the pump what is
    should the psi for a 19,600 sand filter in ground pool be at for normal operation.
    thanks patti

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    JasonLion's Avatar
    Join Date
    May 2007
    Silver Spring, MD

    Re: PSI for in ground pool

    The PSI reading varies quite dramatically from pool to pool, anywhere from 0 to 35, sometimes even a little higher. You need to find out what is normal for your pool. The most useful number is what the PSI reading is right after you backwash/clean the pool.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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    Re: PSI for in ground pool

    When I tried to back wash the pressure will go up and down only from 0 to 8lbs and it slows down a lot. Now it is at 15 and is staying there. Patti

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    Chasville's Avatar
    Join Date
    Jun 2009
    Coastal Plain, NC

    Re: PSI for in ground pool

    The important PSI is not during the back wash, but after, when running normally.

    When I got my house and first started running the pool/pump, normal pressure was about 14 to 15 PSI.
    I have two returns, the main drain and the skimmer.
    We had valves on the returns, so that is was possible to turn off one, the other or both.
    With both on, 15 psi, with just one on, 8 psi.
    When the pressure gauge hit about 22 psi, we could hardly hear the ventury air ports for some of the pool jets.
    It was time to backwash, then the psi returned back to 14 to 15 psi.
    Then our pump motor died and we replaced the pump with a Hayward Northstar (more pump than I need, I guess, but I like it).
    The pressure gauge now reads for normal about 24.5 to 25 psi.
    The Northstar is a stronger pump, with a faster flow rate, thus the greater pressure.

    The pressure depends on the size of pipes, the length of the pipes and how many bends in the piping.
    The pressure also depends on the filter used.
    The pressure obviously depends on the pump.
    21k IG : Hayward Perflex EC65A DE Filter + 1.4 THP Northstar pump : Aquabot Turbo T2 : DelZone Eclipse-4 Ozonator : Floatron Ionizer : Some chlorine
    Pool cover an elephant can stand on. Painted concrete base or shell, with fiberglass upper side walls, and plastic/vinyl rim. Concrete deck.

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