bathrm sink overflow drain causes black muck?

Discussion in 'Plumbing Forum' started by D725A, Jun 14, 2011.

  1. Jun 14, 2011 #1

    D725A

    D725A

    D725A

    Well-Known Member

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    Have a 30yr old pedestal sink that builds up black muck in the drain above the trap, and on the pop-up stopper and in overflow drain. No smell but it's insidious. Been told it may be caused by a reaction with galvanized waste line etc. We're hoping a new waste line and trap may help alleviate the problem. Also was told by plumber that they're doing away with overflow drains these days due to this problem. Just continuing to clean this out with vinegar, baking soda and then diluted bleach is not acceptable. Re-occurs every few weeks. Now we're thinking a new sink with no overflow would help. Not sure this sink is vented properly--would that enable this?

    Thanks.
     
  2. Jun 15, 2011 #2

    inspectorD

    inspectorD

    inspectorD

    Housebroken Staff Member Admin Moderator

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    Let me guess....you, are on city water.
    I seem to see this mostly on older homes with city water. Could be the supply lines at the street also.
     

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