1. Drain your holding tank completely, I have never put antifreeze in the tank. I also make sure my grey and black tank are cleaned and empty.

2. I made an adapter that screws onto my water pump and the other end of the hose goes into a gallon of antifreeze. (Takes two gallons for my camper - Wal Mart put the stuff on clearance for $2 a gallon in the spring)

3. I run each faucet until it runs pink, don't forget the toilet, shower, and any exterior faucets and hoses. This also put antifreeze in any drain traps.

4. I then drain the grey and black tank of antifreeze.

I have never had anything freeze on me.

PS. Don't forget to both bypass and drain your water heater, I just leave the exterior plug out all winter.

Last edited by TAGLARRY; 08/27/13.