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Some thoughts:
I assume you have the black tank valve open when you are flushing your black tank.
Do you leave a hose connected to the black tank when not in use. If you do - the water can be turned on w/o you knowing or perhaps a shut off valve is not working properly. I had this happen to me and now the only time I have a hose on the black tank flush is when I'm doing it.
There has to be something wrong?
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