Forum Discussion
John_Wayne
Aug 07, 2017Explorer II
If while hooked up in the campground you are leaving your black and gray tank valves open that is whats causing your problem. The liquid drains off BUT the solids stay and dry out and harden in the tanks. Leave the black tank valve closed until your tank is 1/2 or more full then drain it and flush out the hose when you drain the gray tank.
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