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Thread: How often to backwash sand filter to avoid channeling?

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    How often to backwash sand filter to avoid channeling?

    I usually backwash my sand filter about every 7-10 days even though the pressure gauge indicates that it's not needed- mostly to prevent any channelling. Is that often enough or too frequent?
    14'x28' vinyl liner inground 3.5-6' deep wedge hopper 15000 gal (used to say 13000- I calculated wrong), 1 hp pump with sand filter, 2 returns, 1 fountain, traditional chlorinated, pool house.

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    Re: How often to backwash sand filter to avoid channeling?

    You should only backwash as needed.

    I have recently heard from a Pentair Filter engineer that aggressive backwashing leads to premature failure of the laterals. I had never considered that before but it makes perfect sense.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
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    Re: How often to backwash sand filter to avoid channeling?

    Would backwashing really all out prevent channeling though?

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    Re: How often to backwash sand filter to avoid channeling?

    Would backwashing really all out prevent channeling though?
    That's a good question. It makes sense to me it would be helpful.

    Brice (Pentair) might see this and chime in. If not, I'll talk with him soon and ask his opinion.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
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    Re: How often to backwash sand filter to avoid channeling?

    Unrelated note Dave, but how often are you having to backwash that big grain elevator of a sand filter that you have?

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    Re: How often to backwash sand filter to avoid channeling?

    Quote Originally Posted by 257WbyMag
    Unrelated note Dave, but how often are you having to backwash that big grain elevator of a sand filter that you have?
    Can't wait to see that answer!
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    Re: How often to backwash sand filter to avoid channeling?

    Quote Originally Posted by Butterfly
    Can't wait to see that answer!
    Heh heh. I'll bet that he has to do it about twice a year. Once when he opens up and maybe once about midseason. I can't imagine him needing to do it more often than that.

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    Re: How often to backwash sand filter to avoid channeling?

    Quote Originally Posted by 257WbyMag
    Quote Originally Posted by Butterfly
    Can't wait to see that answer!
    Heh heh. I'll bet that he has to do it about twice a year. Once when he opens up and maybe once about midseason. I can't imagine him needing to do it more often than that.
    I was gonna guess only once a year
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    Re: How often to backwash sand filter to avoid channeling?

    Unrelated note Dave, but how often are you having to backwash that big grain elevator of a sand filter that you have?
    Aw, Shucks! (I thought you'd never ask....I strut like Tim the Tool Man every time the subject comes up )

    Truthfully, I have such a mess in the Spring, (vow to fix that in the next two years) I have to shock and backwash that pool for several days. The normal psi is around 9 and I let it get to 15 and then clean it. It collects a humongous amount of debris, dirt, and dead algae.....I have to backwash for a good two minutes before the glass starts to clear.

    My "protege", aust1628, has just started his build and, thanks to all of us, he is installing one virtually as big......so much so he wasn't all that impressed when he stopped by and saw the grain elevator. Luckily, he admitted his wasn't any larger or I would've been depressed for a couple of weeks. (yes, I understand what I am saying )

    Back to the subject, Once it's cleaned in the Spring, I am pretty much done with backwashing as long as I don't let the FC slip backwards and have to shock again.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
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    Re: How often to backwash sand filter to avoid channeling?

    Well, all teasing about your huge filter aside, you no doubt need it for that size pool and the fact that you fill it from the pond, or maybe you don't. I can't remember. Gotta have something big enough to be able to get that water clean.

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    Re: How often to backwash sand filter to avoid channeling?

    How about some pics of the grain elevator?
    18' x 36' inground vinyl liner 300# sand filter Blue Diamond Robot Cleaner BBB method

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    Melt In The Sun's Avatar
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    Re: How often to backwash sand filter to avoid channeling?

    There's one in Duraleigh's build thread here.
    11,200 gal, Pebble-Tec; Tristar 2-speed 1hp - Swimclear 325 ft2 cart - SWG - A & A in-floor cleaner - Heat pump. For the poolside cooking, a Yoder Wichita and a Big Steel Keg!
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