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Thread: sand filter question

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    sand filter question

    I have a haward sand filter. I do not know how old it is other than they do not make it anymore and it does not have laterals like the newer models. It has some type of circular grid in the bottom. My question is how do you know when it is time to replace the entire filter and not just the sand. The pressure still seems to rise normally, but I do not know if it is filtering properly.
    24'ag, 1hp hayward powerflo, sand filter

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    Mod Squad Bama Rambler's Avatar
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    Re: sand filter question

    The filtering is done by the sand, so unless something in the filter is broken and leaking or bypassing sand, it doesn't need replacing.

    If anything ever breaks you'll probably have to replace it, simply because you won't be able to find parts for it.
    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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    Re: sand filter question

    so, if an internal part is broken it would be blowing sand back into the pool?
    24'ag, 1hp hayward powerflo, sand filter

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    Re: sand filter question

    yes, you would normally see "lines" of sand accumulating directly under the return jets, with sand in other areas as well. If you have an automatic pool cleaner, turn it off for a couple of days, backwash the filter & watch the floor for 48 hours. If something's broken inside, you'll see very distinct lines of sand build up on the floor since the sand is heavier than the water, it tends to settle to the floor very quickly.
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    Mod Squad Bama Rambler's Avatar
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    Re: sand filter question

    It could be blowing sand back into the pool. Depending on your particular setup there are things that could happen that could allow water to bypass the sand and be returned to the pool unfiltered. But that's not likely.

    Does your filter have a slide valve or a multiport?
    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
    Pool School ----- Pool Math ----- TF-Test Kit

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    Re: sand filter question

    Quote Originally Posted by Ranger987
    yes, you would normally see "lines" of sand accumulating directly under the return jets, with sand in other areas as well. If you have an automatic pool cleaner, turn it off for a couple of days, backwash the filter & watch the floor for 48 hours. If something's broken inside, you'll see very distinct lines of sand build up on the floor since the sand is heavier than the water, it tends to settle to the floor very quickly.
    Just like to add; don't forget the rinse after backwashing or you may get some dirt or sand that you think is from an internal leak.

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