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Thread: Backwashing Sand Filter - How Often is Normal?

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    Join Date
    Jun 2014
    Chandler, Arizona

    Backwashing Sand Filter - How Often is Normal?

    Curious how often fellow sand filter owners find themselves backwashing. I ask because this summer I've found myself backwashing mine once every 2 months. We've had a pretty active monsoon season, and my golden retriever won't stay out of the pool, but otherwise nothing out of the ordinary this year. What is typical for this type of filter?

    Note that before summer arrived I completed a full sand refresh of my filter.

    28k gallon in-ground pebbletec pool w/waterfall and grotto feature
    Triton II sand filter
    "The Pool Cleaner" 4-wheel vacuum
    1.5hp main pump; 1.5hp water feature pump
    Taylor K2006 test kit

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    TFP Guide

    In the Industry

    Join Date
    May 2007
    New Brunswick Canada

    Re: Backwashing Sand Filter - How Often is Normal?

    I only backwash sand filters when an increase of 7 PSI is seen or you are noticing a drop in your return flow. All the stuff that gets past the skimmer basket and pump basket is merely extra filer aid.

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    Smykowski's Avatar
    Join Date
    Sep 2011
    Gurnee, IL (North Suburban Chi-town)

    Re: Backwashing Sand Filter - How Often is Normal?

    You should backwash your filter when you see a pressure rise of 25% above your clean pressure. Once every two months seems reasonable.
    33' round, 23,000 gal AG vinyl , 1HP 2spd PowerFlo Matrix downsized with 3/4HP impeller (X2), Hayward S180T 150# sand filter (X2), Hayward H250 NG heater Pool Store year 1 - $850 for 2 months; Pool Store year 2 - $440 for 2 months, TFPC year 1 - $170 for 4 months; TFPC year 2 - $95 for 4.5 months
    The most important article on this site - The ABCs of Pool Water Chemistry

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