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Mine does the same thing. I went up on the roof and the smell is coming out of the top of the vent pipe every time the toilet is flushed - with chemical in the tank. I wonder if the issue is due to flush water entering into the tank and stirring up sewage gases that come back up the vent pipe and spread into the surrounding area around the trailer? I too would like to know how to rectify the issue? It can be embarrassing at times when camped close to others.
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