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Thread: Filter and Plumbing Help

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    Filter and Plumbing Help

    Hello Everyone:

    I'm in the process of restoring an old pool and have the opportunity to install a new main drain, and suction line. Unfortunately, there's too much concrete in the way to put in new return lines (they were replaced a few years ago). Will it cause any filter/pump issues if I use 2" PVC plumbing from the main drains, as my returns are only plumbed with 1 1/2" PVC?

    Also, can anyone advise as to what size sand filter I need (old one is shot)? The pool is about 17,000 gallons and I have a 1.25HP Whisperflo pump.

    As always, thanks in advance...

  2. Back To Top    #2

    In the Industry
    duraleigh's Avatar
    Join Date
    Apr 2007
    Sebring, Florida

    Re: Filter and Plumbing Help

    Larger suction lines are never a problem and are encouraged.

    If you can, find the pump curve in your documentation or the manufacturer's website and see how much GPM your pump produces (probably somewhere around 80-90 in a normal pool). Then buy a filter that has a gpm capability about 15-25% larger than the pump.
    Dave S. - Forum owner
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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