My gray water tank won't drain. While washing dishes this morning the sink started filling up. I thought at first that I had left the dump valve closed but when I went to open it it was already open...
I always leave both Tanks closed. When the Gray Water Tank is full, I empty the Black Water Tank, then the Gray Water Tank. I then close both Tanks till the next Time. It works well for us. It has also eliminated any Odors.