How to tell the gray tank is full!!
We discovered you can tell the gray tank is full when the kitchen sink backs up into the bath tub.:E Not the most pleasant but at least it was not the black water. The black water we can look in...
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I just leave my grey tank valve open unless I am getting near ready to drain the black tank. Then I will close the grey tank valve for a day to accumulate some water to flush the hose after draining the black tank. Works for me and never find myself standing in a shower a few inches deep in water.
