Most serious boondockers find that their gray water holding tank fills up before their black water holding tank.   The obvious solution is to devise a way to transfer the gray water to the black water tank.   Bobby Williams devised a nifty system to accomplish this.   An added benefit is that the extra gray water in the black water tank aids flushing.

On my 37V, I cut the gray drain pipe and put in a Tee.   I used a rubber connection, so it was easy to put back together.   I got a 110v pump at Granger and use an extension cord to plug it in.   I used a flushing kit from Camping World and mounted it at the top of the black water tank to transfer the gray water into the black holding tank.   The cost was about $100.00.

Gray Water Transfer

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Submitted by Bobby William, mem 831 email