Lack of enough water in the black tank would be a more serious problem. Having the bathroom sink drain into the black tank is very common. The shower or bathtub draining into the black tank is a more serious problem because of the overflow backup danger. I have had the tank fill and backup while taking a shower and it is NOT a pleasant experience. Finding room to change plumbing may be impossible. An alternate is to install a third gate valve to allow flow between the two tanks to equalize the load if you find the black tank is filling much too quickly.
[QUOTE=Christyttoon73;35132]Hi everybody,
BUT we discovered after our 3 week trip to Montana that the master bathroom sink drains in the rear black tank, NOT the Grey tank. The shower drains into Grey tank, though.
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