Quote:
Originally Posted by sundancer 87
can't leave a faucet open for fear of filling the gray tank or if you let the gray water free flow to the ground it will possibly freeze also. .
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You can, of course, allow a slow trickle of water if you are connected to a sewer connection, and your gray valve is open. A little pink antifreeze, along with the blue stuff and "other stuff" in the black tank, along with keeping the cabin warm, should keep the black tank from freezing.
I wouldn't push it down much past the 20's at night, with above-freezing temps during the day. If it's colder than that, all bets are off!