Originally Posted by arkhillbilly
X2 bassdogs: I hook my compressor (set at 40 psi) and start at the faucet at end of run or further away from water inlet, and work my way backwards. I do this two or three times just to be sure. Then I open low point drains, and leave them open. Leaving on the compressor during operation, will assure that water, all water stays at end of each pipe and not run back to a cleared section. I'am good to go whenever I want to travel.
I'm just a bit north of you and have always used air to winterize. I don't want the chemicals in my plumbing either. Like arkhillbilly said, cycle through each faucet several times to include the toilet and outside shower. Open the low point and blow some air out of them also. I remove my whole house filter before starting. I also remove and empty the screen filter on the input of the water pump. Pink stuff only goes into the toilet and P traps.
Personally I don't think a bit of water remaining in your piping will hurt anything. Pex is more flexible than house plumbing and the water has two ways to expand anyway.
I've found over the years that the consensus is pink stuff but air is my preferred method. As far as the statement in the users manual, I just have to disagree with them.