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Thread: Filter running at 40 PSI???

  1. Back To Top    #1

    Join Date
    Feb 2014
    Location
    Leander, TX
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    33

    Question Filter running at 40 PSI???

    Seems like ever since I disassembled, cleaned, and reassembled my DE filter it's been running at a higher PSI. What did I screw up and what are some potential solutions and/or troubleshooting tips the almighty TFP crowd might have??

    Thanks in advance!!!
    23k gal IG pebble, 48 sq ft Pentair FNS Plus DE filter (FNSP 48) 96 GPM, 1.5 HP WhisperFlo pump, Kreepy Krauly Legend Robot.
    Pool was built in 2011, in Central Texas (Leander, TX)

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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: Filter running at 40 PSI???

    If the return jets are weak/non-existant then something is blocking all, or nearly all, water flow. If the returns seem fine then you pressure gauge is broken.
    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

  3. Back To Top    #3

    Join Date
    Feb 2014
    Location
    Leander, TX
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    33

    Re: Filter running at 40 PSI???

    They do seem weak
    23k gal IG pebble, 48 sq ft Pentair FNS Plus DE filter (FNSP 48) 96 GPM, 1.5 HP WhisperFlo pump, Kreepy Krauly Legend Robot.
    Pool was built in 2011, in Central Texas (Leander, TX)

  4. Back To Top    #4
    JasonLion's Avatar
    Join Date
    May 2007
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    Silver Spring, MD
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    Re: Filter running at 40 PSI???

    You can start by checking all of the valves you have. Perhaps you turned the returns off and forgot to turn them back on?

    If that doesn't turn up anything, you may need to open up the filter and check that everything went back into the correct place.

    Also, did you remember to let the air out of the filter after priming the pump?
    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

  5. Back To Top    #5

    Join Date
    Feb 2014
    Location
    Leander, TX
    Posts
    33

    Re: Filter running at 40 PSI???

    Thx. I disassembled the filter. Very gunky for only a few weeks...maybe it's supposed to look like that or maybe it was from the tree pollen. In any event, I noticed the intake filter on the top of the inside was caked and indented, so perhaps that was the cause of the pressure shortage. All seems to be working well/great now...28 psi...

    We shall see how it goes.

    Thx again!

  6. Back To Top    #6

    Join Date
    Jul 2011
    Location
    Austin, TX
    Posts
    60

    Re: Filter running at 40 PSI???

    Definitely keep an eye on the PSI in the tank. High pressure can collapse the DE grids. While I haven't read or performed a study on what pressure is too high, I have replaced many grids from running at pressures under 40psi, especially older grids. So if you're non-friction (before you add any new DE to fully cleaned grids) starts high, check for blockages in the return system, or the filter. It's good to know what your free flowing system pressure is as a baseline, with new DE, and at full.

    is there much of a output change if you bypass the filter "spa mode"? If not, there's definitely something blocking the line. If the output as felt by the jets jumps way up, I suggest disassembling, cleaning and reassembling the grids. A simple mistake in reassembly can be the culprit and the time and DE $$$ are far less the replacing a single grid.


    16,000g in-ground plaster pool, attached spa, BBB, DE Filter, SWG

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