Anti-Freeze in or out

I don't see why you couldn't drain it out after you ensure everything runs pink. The anti-freeze is meant to turn to slush but not expand, so leaving it in should have no harmful effects, aside from those that say you can taste it in the water in the summer. We don't drink direct from our system, so no issue for us.

I always use the anti-freeze and dont blow the lines, and I have never had a problem with our cold winters, which aren't quite as bad as "winterpeg" Manitoba, but sometimes pretty darn close :B