Ĺiving in Alberta, proper winterization is extremely important.
Having burst lines in the past, I tend to err on the safe side.
I start the process by blowing all of the lines with my compressor. I have made a small brass fitting that consists of an airline quick connect, a ball valve and a male hose connect.
I connect my adapter to the city water inlet and to my compressor. With all taps closed I pressure up the system. One by one I open one outlet at a time.
I start with each of the two low point drains in the wet bay. Next the outside shower, kitchen sink, bathroom sink, toilet, toilet hand spray, shower, washing machine, drain behind water heater. Repeat all twice.
I then run antifreeze thru all lines as above. Making sure to fill each trap with antifreeze.
Once this is complete I blow all lines clear. This final.stage ensure that you do not have excess antifreeze taste in the spring.
Prior to doing any of this it is important to remove filter from canister.
This may seem like overkill but the entire process only takes about 30 minutes