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Thread: How often to change sand in sand filter

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    How often to change sand in sand filter

    Having a problem with cloudy water, chemical levels seem good the sand in my sand filter is about 8-9 years old could this be the problem? Also what sand is best to use
    38,000 gallon vinyl lined in ground pool with diving deep end.

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    JasonLion's Avatar
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    Re: How often to change sand in sand filter

    Welcome to TFP!

    There is no reason to change the sand unless it has become badly clumped.

    You should post a complete set of water test results, and describe your water in more detail, milky, murky, white/green/brown, etc.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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    Re: How often to change sand in sand filter

    So you never have to replace the sand?
    38,000 gallon vinyl lined in ground pool with diving deep end.

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    JasonLion's Avatar
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    Re: How often to change sand in sand filter

    Unless something goes wrong, there isn't normally any reason to ever change the sand. Most of the time the filter fails before there is any reason to change the sand.
    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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    Mod Squad Bama Rambler's Avatar
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    Re: How often to change sand in sand filter

    Welcome to TFP.

    The sand is most assuredly not the problem! Contrary to what pool stores say, the sand almost never needs changing.

    Your problem is most likely a balance problem. You probably have a nascent algae bloom.

    Telling us that chemical levels "seem" good doesn't mean anything. Can you provide a set of numbers?
    pH
    FC
    CC
    TA
    CH
    CYA.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
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    BoDarville's Avatar
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    Re: How often to change sand in sand filter

    ^ What they said about not needing to replace the sand except in rare instances.

    Sand filters can use a good cleaning once a year by removing the filter cap and using a garden hose with a gentle flow of water (pump s/b off when doing this). This Post goes into more details on this cleaning process.

    Quote Originally Posted by Jd-underdog
    ...chemical levels seem good...
    This would be even better!
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