+ Reply to Thread
Results 1 to 5 of 5
  1. #1
    Join Date
    Jun 2012
    Location
    West Michigan
    Posts
    33

    Default Nasty Film in Sink Drain

    We have double sinks in our master bath. Every now and then the one on the right has the drain slow down. I have to take apart the drain from the stopper in the bowl, to the pipes under the sink, to the connection to the drain line into the wall and for lack of other description, a nasty black film that is on the inside of the pipes, up to 1/4 inch thick in spots. The large chunks come off fairly easy, but it is hard to completely remove the material. It is almost a rubbery, slimy substance. First, what is it? Second, why does it only happen in one sink in the same bathroom (In the 8 yrs we've been in the house)? Third, how do I get rid of it?

    Thank you!

  2. #2
    Join Date
    Feb 2010
    Location
    South*East
    Posts
    1,168

    Default Re: Nasty Film in Sink Drain

    The only thing that can get into the drain is something you put into it. The reason it's only in one sink and not the other is more then likely there are two different people using the sinks. In most cases it would be you and your wife. One of you is using something the other isn't.

    John

  3. #3
    Join Date
    May 2008
    Location
    Pacific Northwet
    Posts
    1,359

    Default Re: Nasty Film in Sink Drain

    It's mostly soap scum, which is a byproduct of a rather complicated chemical process when soap is used in acidic or mineral-laden water. Insoluble compounds are produced, which then bind to the trap as the water sits. The blackness is from mold growing in the soap scum (yuck!). Many bar soaps contain talc, a mineral, so, therefore, they form scum. The higher the talc content (and possibly the lower the glycerin content), the more likely you are to see scum buildup.

    Note that shaving cream may also contain soap. I don't know how the composition compares to bar soap.

    About.com: How Soap Cleans
    The "Senior Member" designation under my name doesn't mean I know a lot, it just means I talk a lot.I've been a DIYer since I was 12 (thanks, Dad!). I have read several books on various home improvement topics. I do not have any current code books I can refer to. I was an apprentice plumber for two years.

  4. #4
    Join Date
    Jun 2007
    Location
    Fayette County, Ohio
    Posts
    5,557

    Default Re: Nasty Film in Sink Drain

    Soap scum, spittle, and most generally plastic components in the drain. Plastics are a great medium for growing mold. You might try periodically pouring bleach down the drain. Bleach is great for dissolving organics.

    Jack
    Be sure you live your life, because you are a long time dead.-Scottish Proverb

  5. #5
    Join Date
    Jun 2012
    Location
    West Michigan
    Posts
    33

    Default Re: Nasty Film in Sink Drain

    Thanks for the info so far; much appreciated!

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •