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Thread: DE filter and PSI..

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    DE filter and PSI..

    For the first month I had the pool, the PSI started at 20, then went up to 30 after a few days while cleaning,etc. Now I realize that it starts at like 7, then went down to 5 since yesterday. Does anyone know if something is wrong? I also notice the suction is not as good as before while vacuuming.. "Dirt Dust" is accumulating on the bottom of the pool..
    25k Gallon Gunite Inground Pool
    Pentair FNS PLUS DE filter
    Pentair WhisperFlo WF-24 (seems like single speed)
    Chlorine
    Bel Air, MD 21015

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    Mod Squad Bama Rambler's Avatar
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    Re: DE filter and PSI..

    It sounds like you have a suction pluggage. It may be something in the impeller.
    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: DE filter and PSI..

    How do I fix that,
    25k Gallon Gunite Inground Pool
    Pentair FNS PLUS DE filter
    Pentair WhisperFlo WF-24 (seems like single speed)
    Chlorine
    Bel Air, MD 21015

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    Mod Squad Bama Rambler's Avatar
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    Re: DE filter and PSI..

    You can take a water hose and try to flush water backwards toward the skimmer from the discharge of the pump. Sometimes that will dislodge a a pluggage. Is there any air in the pump strainer basket when it's running?
    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: DE filter and PSI..

    Not following you.. Filter is running just psi went down...
    25k Gallon Gunite Inground Pool
    Pentair FNS PLUS DE filter
    Pentair WhisperFlo WF-24 (seems like single speed)
    Chlorine
    Bel Air, MD 21015

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    JasonLion's Avatar
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    Re: DE filter and PSI..

    The fact that the pressure went down means you probably have some kind of blockage in the plumbing on the suction side of the pump.

    Start by checking and cleaning the skimmer basket(s) and the pump strainer basket.

    If that doesn't work, turn the pump off, open up the pump strainer basket area, and as Bama said, try running water backwards through the inlet pipe.
    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: DE filter and PSI..

    About the only reason the filter pressure goes down AND the suction goes down is that there's a blockage in the suction line somewhere. As Jason said, clean the skimmer and pump strainer basket first.
    If the filter wasn't reassembled correctly then the pressure would go down but the suction would be the same or even increase.
    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: DE filter and PSI..

    with the filter off, should I pump some water into where the suction is in the skimmer?
    25k Gallon Gunite Inground Pool
    Pentair FNS PLUS DE filter
    Pentair WhisperFlo WF-24 (seems like single speed)
    Chlorine
    Bel Air, MD 21015

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    Re: DE filter and PSI..

    Quote Originally Posted by JasonLion
    The fact that the pressure went down means you probably have some kind of blockage in the plumbing on the suction side of the pump.

    Start by checking and cleaning the skimmer basket(s) and the pump strainer basket.

    If that doesn't work, turn the pump off, open up the pump strainer basket area, and as Bama said, try running water backwards through the inlet pipe.
    which inlet pipe are you talking about?
    25k Gallon Gunite Inground Pool
    Pentair FNS PLUS DE filter
    Pentair WhisperFlo WF-24 (seems like single speed)
    Chlorine
    Bel Air, MD 21015

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    JasonLion's Avatar
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    May 2007
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    Silver Spring, MD
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    37,879

    Re: DE filter and PSI..

    Open up the pump strainer basket and look inside. There should be an obvious pipe opening where the inlet pipe comes in at the front. You may need to remove the pump strainer basket to get at it.
    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

  11. Back To Top    #11

    Re: DE filter and PSI..

    I fixed it! Thank you guys for all your help. I removed some leaves that may of been clogging up the lines..
    25k Gallon Gunite Inground Pool
    Pentair FNS PLUS DE filter
    Pentair WhisperFlo WF-24 (seems like single speed)
    Chlorine
    Bel Air, MD 21015

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    Mod Squad Bama Rambler's Avatar
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    Re: DE filter and PSI..

    Glad you got it fixed. And thanks for letting us know.
    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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