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Thread: Black Spots in Bathtub.

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  1. #1

    Default Black Spots in Bathtub.

    Some background info first.
    I am in a brand new home, my water heater is a Bradford White 50 gallon.
    It has a powervent installed. The 2" into 3" PVC vent pipe goes up about 2 feet and then horizontally for about 15 feet where it vents out of the basement wall.
    I have a 72" by 48" fiberglass tub in white.

    I have the unit set above the normal heat to a hotter setting, but not the highest available.

    We are on City water not a well.

    I have noticed little black specks on the bathtub recently. There is no shower in the tub. They were not there for the first three months of use. When rubbed they spread like ladies mascara would spread. It takes some rubbing and cleaning to get rid of them.
    I thought at first maybe it was some kind of mold, but since it was only inside the tub, I decided to clean it with a 50/50 bleach water mix.
    I let the tub sit for 3 days and nothing else appeared.
    But once I filled the tub again with hot water, the little specks appeared again.
    They are not in the sinks or toilets.
    The toilets "do" show a very light pink colored ring at water level if not flushed for a couple of days, which cleans off very easily.

    Does anyone have any idea what this is called, what causes this and how I can get rid of it.
    All help would be appreciated.
    If you need more info please ley me know.

    Thank-you,
    Jim

  2. #2
    Master Plumber Dunbar Plumbing's Avatar
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    Drain your water heater and see if it goes away.

  3. #3

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    Quote Originally Posted by RUGGED
    Drain your water heater and see if it goes away.
    And if it does or doesn't...what was the cause?

    If I drain it and it goes away, Great, but that still doesn't tell me what the problem was.
    And if it doesn't go away, then I am still in the same boat as before.

    Do you have any idea what the cause is?

    C'mon Terry, help me out

  4. #4

    Default

    Thanks a lot for all the answers.


    Quote Originally Posted by BMWGreenRT
    And if it does or doesn't...what was the cause?

    If I drain it and it goes away, Great, but that still doesn't tell me what the problem was.
    And if it doesn't go away, then I am still in the same boat as before.

    Do you have any idea what the cause is?

    C'mon Terry, help me out

  5. #5
    DIY Senior Member SteveW's Avatar
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    I'm not a plumber, but you're right, this does sound like some sort of mold or other microorganism. It is strange that you don't get the spots on the sink, but maybe it's because you use the sink more than the tub so that whatever is growing in the tub just doesn't have time to get established in the sink before you rinse the bowl. Or maybe you are using mouthwash which kills off the critters in the sink?

    In any event, I think the idea of draining the water heater does make sense. I don't know if this happens in home water systems, but I do know there are some bacteria that thrive in hot water -- called "thermophiles." I believe these are the things that make the hot water pools in Yellowstone turn different colors.

    Be patient -- you'll get more opinions as the pros have time -- don't forget that this is a *free* resource!

  6. #6

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    Thanks Steve,
    But I have found that the spots only appear with hot water use, not cold water.
    Don't know if this will help the experst in diagnosing or not.
    Jim

    Quote Originally Posted by SteveW
    I'm not a plumber, but you're right, this does sound like some sort of mold or other microorganism. It is strange that you don't get the spots on the sink, but maybe it's because you use the sink more than the tub so that whatever is growing in the tub just doesn't have time to get established in the sink before you rinse the bowl. Or maybe you are using mouthwash which kills off the critters in the sink?

    In any event, I think the idea of draining the water heater does make sense. I don't know if this happens in home water systems, but I do know there are some bacteria that thrive in hot water -- called "thermophiles." I believe these are the things that make the hot water pools in Yellowstone turn different colors.

    Be patient -- you'll get more opinions as the pros have time -- don't forget that this is a *free* resource!

  7. #7

    Question

    I too have the EXACT same problem!!!! It's almost as if I wrote the post! I did flush my water heater and it was full of those black specs...tons of them. I ended up puting in a new hot water heater ,the manufacturer replaced it because they thought it was the heater too. But, after about a week maybe less the black specks returned! To this day on the rare occasion when my wife uses the jacuzzi the specks return and can only be removed with the Mr. Clean Magic Eraser. On some occasions I see a speck or two in the shower and kitchen sink. But, what's very odd is that our other tub does not have the problem??? I ran a tub full of cold water in the poblem tub and saw nothing.

    What is this!!!!???? It seems to be mystifing everyone I talk to. The thread starter is the only person I know who has described my problem...EXACTLY!

    Someone who woks for a city water plant said it was algae that is growing in the tank, some say it's an o-ring. But, neither explanation totally solves this mystery. Why is it not in the other tub? How come it rarely shows up in the showers, but ALWAYS in this one tub?? I don't have stainless steel braided hoses with o-rings just PVC with copper ends. To my knowledge no one on my street has this problem. I've called 2 plumbers and either left a voice mail or talk to the receptionist, but no one has returned my calls....very frustrating!! I know the thread starter and we can't be the only ones with this problem.

    HELP!!! ANYBODY?????

  8. #8
    Homeowner geniescience's Avatar
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    it seems we have sufficient information to be able to use rigor in our method.

    1a. the tub "is fiberglass". Is this an acrylic coated tub?
    1b. are the sinks made of the same material?

    2. spots only appear "after hot water use". Has anyone put cold water in the tub to see whether eliminating that possibility is necessary?

    david

  9. #9

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    Quote Originally Posted by geniescience
    it seems we have sufficient information to be able to use rigor in our method.

    1a. the tub "is fiberglass". Is this an acrylic coated tub?
    1b. are the sinks made of the same material?

    2. spots only appear "after hot water use". Has anyone put cold water in the tub to see whether eliminating that possibility is necessary?

    david

    The tub is fiberglass...acrylic coated. Sinks are not made of the same material. I'm not certain what it's made of, but it's nothing exotic. Sinks like it can be found daily in any Lowes, Home Depot of the like.

    Let me claify something...what we have are small black particles that do not float which causes them to fall to the bottom. They almost stick to the surface and when you try to remove them they just smear like mascara or black grease. They are VERY hard to remove.

    I ran a tub full of cold water and it was crystal clear. Run the tub full of hot or warm water and presto here come the black particles not several hundred maybe < than 25 per tub of water.

    Thanks!

  10. #10
    Homeowner geniescience's Avatar
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    fast forward now to another approach: using a microscope, some of the specks that do come off easily, can be looked at closely. It's either organic growth (cells) or it's a substance.

    If it does turn out to be something organic growing in the hot water pipes, the big question is, "what is organic food matter to it?". Secondly, what high temperature would kill it, in the HW heater, and would it still procreate in the pipes far enough away from the HW heater?

    If it is a material, what is it?

    Summary: Specks come from hot water only. Many were found in the previous HW heater when it was drained. There are occasional specks in all places, but not (not seen so far) in one of the two tubs. There are many in the one tub, an acrylic tub.

    Please confirm this: you can see them flowing when the hot water is turned on and flowing; most of them fall and stick quite hard on the surface, whether it is acrylic or porcelain or another material.

    david

  11. #11

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    Quote Originally Posted by geniescience
    fast forward now to another approach: using a microscope, some of the specks that do come off easily, can be looked at closely. It's either organic growth (cells) or it's a substance.

    If it does turn out to be something organic growing in the hot water pipes, the big question is, "what is organic food matter to it?". Secondly, what high temperature would kill it, in the HW heater, and would it still procreate in the pipes far enough away from the HW heater?

    If it is a material, what is it?

    Summary: Specks come from hot water only. Many were found in the previous HW heater when it was drained. There are occasional specks in all places, but not (not seen so far) in one of the two tubs. There are many in the one tub, an acrylic tub.

    Please confirm this: you can see them flowing when the hot water is turned on and flowing; most of them fall and stick quite hard on the surface, whether it is acrylic or porcelain or another material.

    david
    Yes, you can see them flowing. I have a microscope(from my days as a kid in the late 70's) and had considered looking at them under it. On rare occasions I've seen them in my stainless steel kitchen sink.

    Thanks!

  12. #12

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    You mean to tell me this problem is so unusual that no one can help? Man I'm never gonna figure this thing out!

    JQ5

  13. #13
    Plumber/Gasfitter dubldare's Avatar
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    Expansion tank has given up the ghost.

    I've seen this on relatively new (2-3 years) tanks that are installed on the hot line.

    Those smeary black bits are a nightmare, no doubt.
    --Customers of plumbers: Never be afraid to ask for proof of licensure of the plumber servicing your equipment. A licensed plumber will be proud to show you his personal license.--

  14. #14
    Plumber Cass's Avatar
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    Who was it that said plumbing was easy?

  15. #15

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    If it were a microorganism, it'd have a better chance of surviving in the cold water than the hot. Dunno.

    My sister had a pink tinging problem in her new shower's grout. I read here that this could be a type of mold.

    I've also heard that pink tinging in the toilet could be a sign of rust in the water. M I wrong? Is that rust yr seeing in the sink? Weird that it'd smear, though. Dunno.
    (important note: I'm not a pro)

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