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Thread: Pool Filter (Pentair 60) Pressure Drop

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    Pool Filter (Pentair 60) Pressure Drop

    My filter pump (Challenger) is three years old; replaced a unit that lasted for 13 years. The Pentair FNS 60 DE Filter received all new filter elements last year. When I fired up the equipment this year, charging the filter with DE, the pressure read 10 PSI. This is what it ALWAYS reads in my system when the filter elements are clean and freshly charged with DE. Also germane to this thread: the pressure gauge on the top of the filter was replaced about three years ago as well.

    Since I opened the pool very early this year for a pool inspection in connection with the sale of the house (Pool passed pool inspection OK), I caught the pool water in essentially the same state as it was when I closed last fall: clear, algae free, and water just slightly out of balance. I have yet to backwash. But here is the mystery: the filter pressure has been DROPPING. It now sits at about 6 PSI. Clearing skimmer, filter basket of all the expected Spring debris doesn't change this reading.

    I can only think of a couple of things that would explain this: bad pressure gauge or failing pool pump. Are there any others, or ways to check?
    14,000G Gunite pool, 1-1/2 HP Challenger Pump + 1HP Booster Pump, Waterfall feature, Pentair 60 DE Filter, Polaris 360 Pool Sweep
    Manassas, VA

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    Mod Squad jblizzle's Avatar
    Join Date
    May 2010
    Tucson, AZ

    Re: Pool Filter (Pentair 60) Pressure Drop

    Could be debris stuck in the pump impeller, or more likely is a bad gauge ... often they are only good for a couple years if they are the cheap ones. Highly recommend the glycerin-filled ones like sells.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
    500 sqft Heliocol solar panels, ThePoolCleaner, TF-100 test kit w/ SpeedStir
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    Mod Squad Jimrahbe's Avatar
    Join Date
    Jul 2014
    Bedford, TX

    Re: Pool Filter (Pentair 60) Pressure Drop


    The key here is the feel of the return flow back to your pool.. If the water returning to your pool has a good solid flow,like you normally have, then I would have to agree with Jason that the gauge is the most likely culprit.

    Thanks for posting,

    Jim R.
    Finished in 2015 - 17K Gal, IG, 20' x 25' Almost Rectangular Pool, Pebble finish, three rockport water falls. Pentair Equipment: EasyTouch 4, IC40 SWG, 3 HP VS Pump, CCP520 Cartridge Filter.
    TF100 with SpeedStir and SampleSizer, ColorQ Pro 7, Dolphin Premier Robot Cleaner, added Screen Logic 2, added small 3 person Caldera Spa.

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    Re: Pool Filter (Pentair 60) Pressure Drop

    Sorry for delayed response. I felt what I thought was good pressure from the returns, although I'm not an expert as I rarely use the pool, just maintain it for wife and grandkids. I did order a new gauge, and will install tomorrow. Hopefully that fixes the problem.
    14,000G Gunite pool, 1-1/2 HP Challenger Pump + 1HP Booster Pump, Waterfall feature, Pentair 60 DE Filter, Polaris 360 Pool Sweep
    Manassas, VA

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