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Thread: Filter pressure fluctuates from day to day

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    Join Date
    Jul 2014
    Philadelphia. PA

    Filter pressure fluctuates from day to day

    My cartridge filter, with clean or new cartridges runs with a psi of 26. A few weeks ago the pressure changed over night (the pump is off at night) to 22 and the water flow over the waterfall spill way and in the pressure side cleaners was really fast. Then a few days later the pressure changed overnight again to 28 and the spill way was less robust and the cleaner ran a little slower. This has happened a couple of times over the past couple of months and today the pressure is back to 22. What could be causing these big swings in pressure? Thanks!

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    40,000 gallons (estimate), 23 yrs old, IG, plaster, StaRite 3 cartridge filter, Magnetek 2 hp pump, Intellichlor SWG, spa w/ waterfall, pressure side cleaner w/ booster pump, Max-E-Therm Heater

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    Azgirl71's Avatar
    Join Date
    Apr 2015
    Sierra Vista, Az

    Re: Filter pressure fluctuates from day to day

    The only thing I would guess is maybe a small clog forms and then it works its way loose. As long as you have very good water flow from the return all you can really do it monitor it. Another of our members may have another idea.
    Intex AG vinyl 15' x 48" 4,300 gallons due to skimmer install, Krystal Clear SF pump combo 2800 GPH, Krystal Clear SWG, Pool Blaster Max vacuum, Hayward thru the wall skimmer, TF 100 test kit with speed stir, K 1766 Taylor salt test, My SLAM Process

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    n240sxguy's Avatar
    Join Date
    May 2014
    Benton, KY

    Re: Filter pressure fluctuates from day to day

    Maybe a tear somewhere on one of the cartridges? Maybe one time the pump comes on a pleat opens up with a small tear so it has less pressure, then the next time that pleat is closed, and the pressure is normal. Have you checked to make sure all the cartridges are seated properly and the seals are clean? Does the gauge go immediately to zero when the pump is off? Does it ever change during the time the pump is running? Or only after it turns off and back on?

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    33K gallon IG vinyl. 1.5HP Waterway Mustang pump. 600 lb sand filter. Polaris 280. Circupool SI-60+. TF-100XL

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