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Old 10-11-2020, 07:29 AM   #1
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Red face HELP! Black water tank overflowed INTO motor home!

Two days ago I overflowed the toilet on my small black water tank on the second flush of the tank. Water was mostly clean but still black water. I cleaned and sanitized everything I could see.

I took off a panel in the kitchen wall and have noticed moisture under the plastic sheeting that is behind the toilet and under the kitchen area.

How do I get to the rest of the moisture to clean.

The motor home was not level so the flow went from the middle located toilet through the kitchen area then out the drivers side front. Only two basement areas has moisture.


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Old 10-11-2020, 07:50 AM   #2
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If it is under the cabinet remove the drawer/doors/cabinet floor. Rip up the plastic and carpeting if it is there. Use a utility knife to cut along cabinet..
Use a shop vac to get as much of the liquid as possible. Run a dehumidifier and small fan to circulate the air. Not sure what what you can spray to disinfect but I'd do some research.
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Old 10-11-2020, 08:54 AM   #3
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To disinfect, I have used 50/50 mix of isopropal alcohol and water. It works great and evaporates on its own. If, needed get an apartment size dehumidifier, fans, and dry out first, then one could use a pump sprayer and soak everything again and dehumidify it, again.
Might be able to find a carpet cleaner, that will sell you product they use.
Best of luck.
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Old 10-11-2020, 09:04 AM   #4
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Thank you for your response. The plastic sheeting is pretty tight against the floor but will get an exact to loosen
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Old 10-11-2020, 01:46 PM   #5
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Much more of the problem is getting everything completely dry. Was the water from a running toilet or a flush system or.................? I think that you are far too concerned about sanitizing and not enough about everything being completely dry. If you vinyl flooring is stuck down there is probably no water under it.
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Old 10-11-2020, 02:08 PM   #6
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Sorry you experienced that .....
After drying out and cleanup don't leave black tank dump valve closed while using flush system

Are you sure the water came up/out toilet bowel OR from a malfunctioning anti-siphon vacuum breaker device (usually inside bathroom sink cabinet)

Up/Out toilet bowel...then tank was FULL and water was going up vent pipe until toilet bowel seal failed

Filed anti-siphon valve then water was CLEAN as it never went into the tank
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