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Winterizing the Black water flush is important because the backflow preventer is higher than the toilet and sometimes is hard to find. We missed winterizing it. When we decided to flush the BW tank we had a stream of water coming out of the closet in the kitchen. that was because the backflow preventer was made from thin polycarbonate and when it froze it broke into many pieces. They hid it in the broom closet.
Next you'll have to make sure the city water line entering the system is full of pink stuff. Depending upon your system you may have to run the pump and push in the check valve (after removing the screen) until the fluid comes out. Some systems have you connect there so it's one less worry.
Don't forget the toilet and make certain you have run enough pink stuff into the p-traps under all the sinks.
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