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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Our gray tank will fill in less than 24 hours so we leave the valve open until the last night. Works fine for us. Last day dump the black, open up the gray again and we are ready to go.
