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Old 10-13-2018, 11:37 PM   #1
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Black Water explosion from BR sink...

We had a black water explosion out of the bathroom sink after the black tank flusher was turned on without my husband or I being aware of it.

Of course we had company, having a nice dinner.

A visitor with RV experience says the toilet and and bathroom sink share a vent pipe, the black tank got full and the bathroom sink was the easiest way out. Does this sound logical?

Itís been 2 nervous weeks and nothing weird has happened since.

There was quite the comedy of errors and I want to know if the vent story sounds true.

BTW, yes, I did a search. I only found a story about Dawn suds coming out of a vent pipe from a black tank. I only wish. And a lot of other random stories and hounds unrelated to this.

Thanks for any information.
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Old 10-14-2018, 07:22 AM   #2
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Some units, from reading on the forum, have the bath sink dump into the black tank. Yours may be this way because if there is only one vent in the roof, then both black and gray share the same vent. That type you would have water coming out of the roof vent.
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Old 10-14-2018, 07:36 AM   #3
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Your lavatory drain doesn’t necessarily have to drain to the black tank for this to happen. If your gray tank vent (or the lavatory vent) connects to the black tank vent before it goes through the roof, and if your gray tank dump valve is closed, the water from the flush system will first fill your black tank, then rise up the black tank vent to where the gray vent connects. The water will then drain down your gray vent and drain and into your gray tank, filling the gray tank. Then that water will rise up into your gray drain and vent and overflow at the lowest drain connected to your gray system — usually the shower — but if you have a waterless trap on your shower, it will act like a check valve and prevent the water from overflowing at the shower, so it will continue filling until it gets to the first drain with a normal trap — usually the lavatory.

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Old 10-14-2018, 07:56 AM   #4
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Black tank flush cause more problems than the good they do.
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Old 10-14-2018, 08:01 AM   #5
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Black tank flush cause more problems than the good they do.
Really? Seems like a great idea. Maybe the kind you stick in the toilet is better but seems like a hassle.

Nothing came out of shower which is what I thought should happen. Barf.
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Old 10-14-2018, 08:03 AM   #6
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Black tank flush cause more problems than the good they do.
Only in the hands of "untrained Professionals "! Youroo! !
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Old 10-14-2018, 08:04 AM   #7
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First, never leave a hose hooked up to it unless you intend to use it right away. Disconnect after use.
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Old 10-14-2018, 08:08 AM   #8
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Nothing came out of shower which is what I thought should happen. Barf.
You probably have a waterless trap on your shower. If not, your lavatory drains into your black tank and your shower does not.

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Old 10-14-2018, 08:38 AM   #9
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I don't think they use the waterless traps on the lower end units. I could be wrong, but at shows, I haven't seen them!
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Old 10-14-2018, 08:42 AM   #10
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I don't think they use the waterless traps on the lower end units. I could be wrong, but at shows, I haven't seen them!
I hope you don't see them, unless you carry a screwdriver to remove panels so you can look under the shower! Youroo! !
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