New Pedestal Sink Not Draining Normally

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by crazycat, Apr 3, 2008.

  1. crazycat

    crazycat New Member

    Messages:
    2
    I just installed a new pedestal sink that drains very slowly. The top of the drain (at the bottom of the sink) is now only about 4" above the wall drain outlet. This is much less distance than my previous sink. My question is there a minimum height differential required betwenn the bottom of the sink and the wall drain outlet? Could this be causing the problem? Otherwise the drain is free of debris, clogs. Thanks for any advice!
  2. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Messages:
    22,126
    Location:
    New England
    Does the sink have an overflow? Is the grid strainer have small holes? Either of these things can slow the flow down. If the trap isn't trying to flow uphill, the drop shouldn't matter much.
  3. crazycat

    crazycat New Member

    Messages:
    2
    Yes, the sink does have an overflow. What is a small grid strainer? What modification do you recommend that I make to make the sink drain faster?
    Thanks.
  4. bombjay

    bombjay New Member

    Messages:
    62
    Just make sure your 'pop up' is all the way up.
    Try removing it to see if things go better.
  5. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Messages:
    22,126
    Location:
    New England
    If the sink has a stopper (and it isn't internal), that isn't the problem. Some sinks don't, or the mechanism is below the strainer. When the holes are small and there's no overflow, it's hard to get the water to start draining. Sounds like you have a clog somewhere. You might want to post a picture so people can see the arrangement you have.
  6. Redwood

    Redwood Master Plumber

    Messages:
    7,450
    Location:
    Connecticut
    Make sure the wall arm of the trap isn't too long and shoved too far into the wall!
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