@Jeff k.... " isn't removing the water good enough"
That depends on where you live. If you have any chance of a deep freeze in your area, than NO, it's not enough in my opinion. Even with blowing the system out, you always have the chance of trapped remaining water in a line or component. For the cost of 2-3 gallons of RV/Marine antifreeze ($3-4 gal.), it's cheap insurance. This stuff is not like auto antifreeze. Once flushed out at the beginning of the season, and even if a little remained, it's not going to kill you.
Steve