Quote:
Originally Posted by gmc
Best solution for gray - if connected to sewer - is to leave the valve open... Then no measurable water to freeze.
We leave ours open except the day before dumping black (collect some water to flush the hose...)
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This seems to be contrary to most recommendations from the "experts" in both of the large motorhome forums. There were even a few reports about sewer rats entering the tanks through the open valves.
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