Toilet That Isn't Used Hardly At All That Has This Black Mold-ish Residue In The Tank - Plumbing - DIY Home Improvement | DIYChatroom
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Old 11-21-2015, 08:49 AM   #1
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Toilet that isn't used hardly at all that has this black mold-ish residue in the tank


We have this bonus room toilet that doesn't get used very often (maybe 4-5 times a month) that has this black mold like residue inside the upper tank.

Is this something that is always going to come back after I clean it up just because it sits there unused?
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Old 11-21-2015, 09:13 AM   #2
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Most likely.
A simple flush more often will go a long way to prevent it.
Dropping in one of those blue toilet cleaning blocks may also help.
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Old 11-24-2015, 04:23 PM   #3
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Could be iron of t you are on a well
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Old 11-24-2015, 08:42 PM   #4
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Quote:
Originally Posted by gassyplumber View Post
Could be iron of t you are on a well
How does iron create mold?
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Old 11-25-2015, 01:13 AM   #5
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This happened to me in a toilet tank that was in a room with poor ventilation ( the outside vent ran but was mostly stuccoed over). It looked like someone had stuffed black bunny rabbits in the tank. The mold even flowed over the tank. The room had been unused for at least 3 mths. I blasted it with chlorine bleach which was a mistake for me as I am sensitive to bleach and the ventilation was poor. I didn't know that at the time. joecaption's option seems more reasonable. If that doesn't work, try the chlorine bleach in the tank. The CDC states the people most sensitive to black mold are those with allergic asthma. My room had a shower which added more moisture. Since mold spreads by spores, it might be something to look for in the rest of the house. I think gassyplumber meant an iron stain?
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Old 11-25-2015, 01:19 AM   #6
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Found this also : http://extension.psu.edu/natural-res.../iron-bacteria
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Old 11-25-2015, 07:05 AM   #7
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Could also be the rubber from the gaskets. Depending on its age, they should be replaced.
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Old 11-25-2015, 05:25 PM   #8
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Drop a chlorine toilet tank tab in the tank. Heck I get that during the summer from Cleveland water.

Last edited by Ghostmaker; 11-25-2015 at 05:29 PM.
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