Q: Which should I do?
A: There are three schools of thought.
- Blow out the lines with air and no need to use RV anti-freeze.
- Blow out the lines with air and then use RV anti-freeze.
- Skip blowing out the lines with air(see why below) and use RV anti-freeze only.
Based on #3, people don’t want stuff that is sitting in bottom of an air tank blown into their water lines, bacteria, rust particle and who knows what else.
I only ever do #3 and have been for last 13 yrs and two different RVs.