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Thread: installing waste shut off valve vs replacing spider gasket

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    installing waste shut off valve vs replacing spider gasket

    Searched the forums & did not see this issue addressed.

    Replaced the spider gasket in my multi-port valve 9 months ago. Now when backwashing, the water empties out of the waste line. The valve assembly itself (spring, plate, etc) is in good shape, but the spider gasket seems a bit raggedy.

    Before I replaced the the spider gasket the 1st time I researched the internet & I seem to remember several recommendations to install a shut off valve on the waste line because spider gasket, reportedly, can be problematic and often leaks.

    And, from an engineering perspective (yes I am one of those, an engineer) the whole multi-port design seems pretty dodgey at best anyway. So I was wondering instead of replacing the spider gasket (there is no leaking when with the valve in the filter mode) are there any ramifications to installing instead a shutoff valve on the waste line then turning it off when backwashing? Would this adversely affect the backwash function or other filtering functions?

    Thank you.

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    Mod Squad JohnT's Avatar
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    Re: installing waste shut off valve vs replacing spider gasket

    It works, but it's easy to forget the valve and deadhead your pump thinking you are backwashing. A bad gasket can also end up allowing water to bypass the filter, and you may not notice that happening. The leak to waste is the most noticable sign of spider gasket damage.
    TFP Moderator
    20K Gallon 20X36 Vinyl Inground
    Hayward S244T Sand Filter with 1HP Whisperflo Pump. Liquidator C-201 and Solar Heat

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    Re: installing waste shut off valve vs replacing spider gasket

    Figured that the spider gasket was damaged ... it didn't look too good. Just hoping to avoid the tedium & expense of replacing it ... last time it took an entire afternoon what with scraping out the old gasket & those gaskets aren't cheap about $80 or so. But I was wondering about the possibility that filtering could be adversely affected. So thank you for the information.

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    Re: installing waste shut off valve vs replacing spider gasket

    Another question: There was sand inside the valve compartment. Would that indicate that there is something else wrong with the multiport valve? Thank you.

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    Mod Squad JohnT's Avatar
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    Re: installing waste shut off valve vs replacing spider gasket

    Quote Originally Posted by riegal
    Another question: There was sand inside the valve compartment. Would that indicate that there is something else wrong with the multiport valve? Thank you.
    Before hazarding any guesses, can you post some details about your pump and filter?
    TFP Moderator
    20K Gallon 20X36 Vinyl Inground
    Hayward S244T Sand Filter with 1HP Whisperflo Pump. Liquidator C-201 and Solar Heat

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    solarboy's Avatar
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    Re: installing waste shut off valve vs replacing spider gasket

    I once split a sand filter by forgetting to open the waste valve whilst Backwashing...expensive mistake.
    Self built 5500 gallon bare concrete (temporarily) pool with limestone coping, Pentair Swimmey 1/2 HP pump, Triton sand filter with DE, Simpool peristaltic muriatic acid pump with pH sensor and Monarch SWG. Home made solar heater with Pentair Compool control panel and 3 way valve. 1 skimmer, 1 main drain, 2 returns, 2" plumbing, Hayward auto fill valve.

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    Re: installing waste shut off valve vs replacing spider gasket

    Quote Originally Posted by riegal
    Another question: There was sand inside the valve compartment. Would that indicate that there is something else wrong with the multiport valve? Thank you.
    Welcome to TFP!!

    I'll go against John T's advice and hazard a guess

    As long as the troughs that the spider gasket (A/K/A - wagon wheel) sits in are good, I'd suspect a wrecked gasket that allowed the sand in the tank to enter, and thereby further ruin an already suspect gasket

    The truth is that installing a valve on the backwash port will delay the inevitable only if the only bad spoke on the gasket is the one that separates the 'waste' line from normal filtering

    We'll be happy to help you figure this one out
    Luv& Luk
    -Ted

    Having done construction and service for 4 pool companies in 4 states starting in 1988, what I know about pools could fill a couple of books - what I don't know could fill a couple of libraries :-D

    POOL SCHOOL, TF Testkits, Jason's Pool Calculator, CYA vs. cl chart, (Just a few DARNED handy links!)

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