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Thread: Sand filter waste port question

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    Sand filter waste port question

    I bought a used Pentair SD40 sand filter off of craigslist and hooked it up to a 3/4 hp pump. It is now running but there is a small amount of water coming out of the waste port. I don't have anything hooked up to it yet to close it. Is that normal? I was just going to attach some pvc and a valve to close it, or is there a gasket leaking in the multivalve port?

    If it is a gasket...(I don't see any gaskets listed for this multiport anywhere on the internet, nor at the pentair website, only the entire multiport assembly seems for sale)...any problem with just attaching a valve to keep it from leaking?

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    duraleigh's Avatar
    Join Date
    Apr 2007
    Sebring, Florida

    Re: Sand filter waste port question

    or is there a gasket leaking in the multivalve port?
    Most likely. There is a gacket inside the valve called a spider gasket or wagonwhell. I'm surprised it doesn't show on the diagram.

    The valve onto the waste port is a clever fix but perhaps replacing the spider gasket is better long may fix some other issues as well.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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