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Thread: Backwash Frequency

  1. Back To Top    #1

    Join Date
    May 2010
    Lehigh Valley, Pennsylvania

    Backwash Frequency

    Hey guys,

    I had a question about the frequency of backwashing. Pool was constructed last fall, so this is my first year. It's been open since April. I have a Hayward DE filter and I was wondering how often to backwash. I have the pressure gauge set for the 10 psi increase, which is when my PB said I should backwash. But being open since April (clean starting pressure of 10 psi), the needle has barely moved above my start pressure. Currently it is just below 12 psi after about 3 months of operation. At the rate its moving, following the +10 increase method, at most I'd probably only have to backwash once this season (not that I would mind that) .

    Is this the correct rule to follow or should I backwash regardless after a set number of months?

    Thanks for any advice!
    25K gal vinyl inground, 1HP Hayward Pump, Hayward DE 4820 Filter

  2. Back To Top    #2

    In the Industry
    duraleigh's Avatar
    Join Date
    Apr 2007
    Sebring, Florida

    Re: Backwash Frequency

    Hi, Rob,

    You are on the right track. Your pressure guage is the indicator a backwash is needed. If it doesn't go up, there is no need to backwash.
    Dave S. - Forum owner
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

  3. Back To Top    #3
    JasonLion's Avatar
    Join Date
    May 2007
    Silver Spring, MD

    Re: Backwash Frequency

    In addition to what duraleigh said, I would backwash the filter when the pressure gets to 16, rather than waiting for 20. Also, you should clean out the filter at least once a year, normally at the end of the swimming season, even if the pressure never gets that high.
    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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