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Thread: Is check valve at backwash port needed

  1. Back To Top    #1
    Krickett's Avatar
    Join Date
    Jul 2008
    Arlington, Texas

    Is check valve at backwash port needed

    I'm replacing my filter with a side mount sand filter using a 7 position multiport valve. My current system had a DE filter with a backwash tank and between the filter and tank there is a check valve. I have since removed the tank and backwash to the sewer system but since I'm replacing these things I was wondering if I really need the check valve since the multiport valve is above the piping outlet. I hope that is clear.
    21k gal, plaster IG pool with spa
    Main - 1 skimmer, 1 main drain, 3 returns, Spa - 1 drain, 4 returns
    WhisperFlo Dual Speed WFDS 1.5 HP pump
    S310S 30" sand filter
    Polaris 360 pressure cleaner

  2. Back To Top    #2
    Mod Squad JohnT's Avatar
    Join Date
    Apr 2007
    SW Indiana

    Re: Is check valve at backwash port needed

    No, you don't need it.
    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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