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Old 11-18-2015, 12:43 PM   #1
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Back flushing black tank

Recently we back flushed our black tank and noticed water in shower from around skylight. Could we have filled tank too full and water went up breather pipe and leaked into shower thru roof?
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Old 11-18-2015, 12:48 PM   #2
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Yes it is possible! Youroo!!
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Old 11-18-2015, 01:04 PM   #3
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Yes it is possible! Youroo!!
Only if the roof leaked before!
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Old 11-18-2015, 02:04 PM   #4
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Thanks for the replies. We had no noticeable roof leak previously.
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Old 11-18-2015, 02:14 PM   #5
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When you used back flusher, was the tank dump valve open?
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Old 11-18-2015, 03:29 PM   #6
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The tank value was open and the toilet overflowed
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Old 11-18-2015, 03:32 PM   #7
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Sounds like vent plugged up for black tank, any thing come out of tank?
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Old 11-18-2015, 03:39 PM   #8
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The tank value was open and the toilet overflowed
If your valve was open the entire time your drain may be at least partially plugged. All the water from the flush should've went straight out.

Or did you fill (overfill?) your tank before opening the valve?
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Old 11-18-2015, 03:56 PM   #9
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I think you have 2 seperate issues going on here...

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Originally Posted by Mowinks View Post
Recently we back flushed our black tank and noticed water in shower from around skylight. Could we have filled tank too full and water went up breather pipe and leaked into shower thru roof?
To be clear, water was coming from out of the skylight? Did the water have a black tank oder?

Is it possible the water was condensation from a recent shower?


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The tank value was open and the toilet overflowed
Again, to be clear, the black tank was fully drained?

How long did it take for the toilet to overflow?

Also, typically, the seal on the toilet will prevent backflushing to occur. now, if you setp on the pedal and open the valve, all bets are off (don't ask me how I know...just trust me )

It initially sounds like you have a clogged line somewhere. Waiting for your reply so we can problem solve some more.
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Old 11-18-2015, 04:04 PM   #10
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Yes, the black tank emptied. This happened on 2nd back flush when we overfilled tank
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