I'm getting ready to winterize a 2010 Free Spirit and would like to know if anyone has personally done this. My Free Spirit manual provides instructions for winterization by using air pressure to blow the lines. I like this approach better than using pink antifreeze as it leaves a nasty taste in the water even after running several tankfuls through the system. My question is: how many lbs of air pressure will the water lines will tolerate? Any other advice would be welcomed.