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Thread: Pressure gauge psi

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    Pressure gauge psi

    Just replaced sand filter valve with pressure gauge installed; I didn't use a pressure gauge on the old valve. My questions is, since I can't find an answer with Hayward, what pressure reading should be showing? Mine is registering 19 psi after backwash; the inflow is strong. My sister told me hers always registers between 2 and 5; she has a lovely pool. Just wanting to make sure I'm okay. Also, at what psi should I backwash? Thanks.
    AG-round 14645
    Hayward sand S-180-T filtration rate 20 gpm ft^2; filtration/backwash flow rate 35 gpm; max. working pressure 50psi
    Hayward Powerflow LX 1.5 hp; 70 gpm.

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    JasonLion's Avatar
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    Re: Pressure gauge psi

    Welcome to TFP!

    There is no standard pressure, every pool is different. 19 and 2 are both reasonable starting pressures.

    You should backwash when the pressure goes up by about 25%, in your case that is around 24 psi.
    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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    Mod Squad Bama Rambler's Avatar
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    Re: Pressure gauge psi

    19 psi may be perfectly normal for your pool. Just backwash whenever the pressure rises about 25% above that.
    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

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    Re: Pressure gauge psi

    I thank you for your reply.
    AG-round 14645
    Hayward sand S-180-T filtration rate 20 gpm ft^2; filtration/backwash flow rate 35 gpm; max. working pressure 50psi
    Hayward Powerflow LX 1.5 hp; 70 gpm.

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