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Thread: Step down sizes of PVC for backwash discharge

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    Taterfink's Avatar
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    Step down sizes of PVC for backwash discharge

    I have searched the forum and found posts relating to plumbing the backwash with PVC vs hose. However, I've not found one (so far) that answers my question.

    My filter is approx 105 feet from the street and I'd like to get away from having to roll and unroll that blue hose all the time. My plan is to plumb it with PVC.

    I'd like to start the run at the filter with 1.5 " pipe and step the size down as I get farther from the filter and closer to the street. My thoughts are to go maybe 30' with 1.5", step down to 1" for abt 30' then finish up with 3/4" for the end of the run.

    Does anyone have any advice? Am I stepping down too far? I know that at the end of 100' of hose the pressure is decidedly softer than at the filter end of the hose.

    Thank you for any input.
    Angie M.
    AG, 26' x 52" Intex Ultra Frame, vinyl, 14667 gal. And LOVING it!!! Hayward S15922S 1HP, 2SP pump and Hayward S220T Sand Filter. Hard plumbed with PVC, added second return, intex SWG, Hydro Pool widemouth skimmer. Set up in May 2012!
    N.E. Florida. TF100 - Best investment EVER! (Well, for the pool anyway)

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    gtemkin's Avatar
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    Re: Step down sizes of PVC for backwash discharge

    Stepping down is not a good idea. You need a good flow to backwash properly. Stepping down is like putting a cork at the end of the run, it reduces flow.
    21K gal 16' x 40' in-ground pool built 1959, old school with Jacuzzi bronze pump, American Products 24" Sand Filter & Americana Multiport valve, Jandy Lite2 millivolt heater, Coverstar cover, and classic Kreepy Krauly.

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    duraleigh's Avatar
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    Re: Step down sizes of PVC for backwash discharge

    Do not step down for the very good reasons gtemkin states above.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Taterfink's Avatar
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    Re: Step down sizes of PVC for backwash discharge

    I won't be stepping it down. Thank you both for the quick turn around.
    Angie M.
    AG, 26' x 52" Intex Ultra Frame, vinyl, 14667 gal. And LOVING it!!! Hayward S15922S 1HP, 2SP pump and Hayward S220T Sand Filter. Hard plumbed with PVC, added second return, intex SWG, Hydro Pool widemouth skimmer. Set up in May 2012!
    N.E. Florida. TF100 - Best investment EVER! (Well, for the pool anyway)

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