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  1. #11
    Join Date
    Mar 2009
    Posts
    1,387

    Default Re: Odd black mold like substance in sink drain

    Howdy consider baking soda 1/2 cup poured into the drain and then 1 cup of vinegar. i cover the drain so the pressure created by the chemical reaction goes down the drain. and a n after flushing the pipe once this process is complete i then use a 1/4 cup ammonia pouring it into the drain again i cover it and let sit for 30 minutes then run water for couple minutes the ammonia kills mold and fungus. Also using an ammonia based cleaner in the bath fixtures is preventive and maintenance too.
    NEVERix ammonia and clorox as posionous gas is result and death may occur...ic

  2. #12
    Join Date
    Aug 2009
    Posts
    62

    Default Re: Odd black mold like substance in sink drain

    My master bath sink accumulates this as well, to the point of clogging about every 9 months. I haven't tried bleach, though I probably will to see if this keeps it under mild control.

    I believe the initial problem was my wife's hair clogging the drain. She doesn't wash her hair in the sink either, but with her long hair she does 'shed' a few in to the sink periodically and this formed a block about 2yrs ago which I removed, but it was since then that the black sludge started. It does not occur on any other sink, though my guest bath had a resonable accumulation of mold/mildew in the DWV plumbing when I cut it loose (also black, but not sludgy like this stuff is) to remove the vanity.

  3. #13
    Join Date
    May 2010
    Posts
    1

    Default Re: Odd black mold like substance in sink drain

    We are the having the same issue... ours is occurring in both sinks.... we are on well water and also have a waterless tank system as well as a water conditioning system.

    We are not having a problem with the other bathroom or kitchen sinks so we were thinking it could possibly be the mouthwash as well because we use it quite frequently and our kids do not. Also, it is worse in my sink and I use mine more often than my husband.

  4. #14
    Join Date
    Nov 2010
    Posts
    1

    Default Re: Odd black mold like substance in sink drain

    Quote Originally Posted by NEC View Post
    It is hair that feeds it.........HAIR.
    The shaving cream forms a gunky slime that collects all sorts of things like hair which contributes to things growing in the drains.


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  5. #15
    Join Date
    Jun 2007
    Location
    Fayette County, Ohio
    Posts
    5,557

    Default Re: Odd black mold like substance in sink drain

    Soap scum, toothpaste, hair, and spittle will create the black scum especially on the stems of stoppers that are plastic.

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

  6. #16
    Join Date
    Oct 2011
    Posts
    1

    Default Re: Odd black mold like substance in sink drain

    Same problem with the black gook buildup in the bathroom sink, had to call plumber several times. Last time, my neighbor, who is a plumber came himself, told me he had the same problem with the black gook only on his sink, he uses Listerine. His wife didn't, and her sink was clear. I use Listerine several times a day.
    Later checked with my brother, he is a chemist. He said several of the components in Listerine, probably thymol, and methyl salicylate, tend to oxidize and polimerize (translating here, so not sure of the English word). This would cause the black gunk.
    Solution, the plumber neighbor uses his toilet to spit the Listerine out, I was using the kitchen garbage disposal side, however, that is now clogged, so ........ I will follow all your vinegar/salt/soda/boiling water advice posted earlier, thank you very much for all the advice !!!

  7. #17
    Join Date
    Dec 2009
    Posts
    3

    Smile Re: Odd black mold like substance in sink drain

    Well, it's been almost a year since I first posted. I started NOT rinsing out my sink after I had spit Listerine in it. And, voila!~no more black mold in my sink drain. Actually, it is not listerine...it is the equate version of it in citrus flavor.

  8. #18
    Join Date
    Sep 2011
    Location
    Midwest
    Posts
    37

    Default Re: Odd black mold like substance in sink drain

    It sounds like what you are describing is a biomass. Often the initial complaint is that the water smells. What you are really experiencing is air being driven up, out of the drain into your face.

    This biomass is most often found in bathroom sinks. If this is the case and you don't have it at all drains, the cause is most often make-up. Also some of the fancy soaps.

    I have had to pull the trap and ream it out with paper towels to get it out. Bleach dosen't even seem to help. The only thing I have found that really works, is to take it apart and clean the trap.

    Be warned. Some of that stuff can get really nasty. Wear disposable gloves and work over a garbage can.
    Waste not, want not.
    Use it up. Wear it out. Make it due, or due without.

  9. #19
    Join Date
    Feb 2012
    Posts
    1

    Default Re: Odd black mold like substance in sink drain

    I think I have the same issue in our master bath sink. Just to be sure, the stuff coming out of my sink is a black, ultra-smooth, gelatin-like substance that is perfectly formed to the drain pipe. Chunks of it come out in cylindrical shape when I take ther trap apart. Same as everyone else?

    I also suspect that mouthwash is the cause. The problem seemed to begin when I began using a certain brand of mouthwash.

    Anybody had good luck with the homemade remedies listed previously?

  10. #20
    Join Date
    Jun 2007
    Location
    Fayette County, Ohio
    Posts
    5,557

    Default Re: Odd black mold like substance in sink drain

    As most of this is generally organic matter dumping bleach down the drain periodically should help.

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

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