very odd problem !!

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by ianmulluk, Nov 29, 2004.

  1. ianmulluk

    ianmulluk New Member

    I have a very slow draining sink in the bathroom.
    I have removed the p trap and cleaned it out.
    I have cleaned the other pipes and can pour water down them successfully.
    I can pour water throught the p trap when it is not connected.

    HOWEVER - when I reconnect it all , after only 1 cupfull of water down the sink it starts backing up .
    How can this be ??
    The p trap works fine when i disconnect it and run water through it and we have NO blockage

    Really Odd - HELP !!

  2. Gary Swart

    Gary Swart In the Trades

    Yakima WA
    Slow drain

    I've seen older homes that did not have a vent for the bathroom basin. That's what it sounds like to me. Check to see if there is a vent or if the vent is blocked. If there is no vent at all, you might look at a Studor vent for the basin.
  3. srdenny

    srdenny Plumbing Contractor

    SF Peninsula
    Remove the pop-up and inspect inside the drain.. There may be an obstruction in the overflow holes in the tailpiece.
  4. Bob's HandyGuy

    Bob's HandyGuy Senior Member

    Also, make sure your pop-up is adjusted so that it goes up all the way.
  5. jimbo

    jimbo Plumber

    San Diego
    If as little as one cup of water backs up I agree that the problem is right there in the pop up drain assembly. An amazing amount of "gook" ( soap mixed with decaying hair) can build up there.
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