Hello all, glad to be back.

I've watched and read several video's (youtube) that state there is no need to use antifreeze. Just blow the lines and cap the outlet. If no bubbles come out, you have a tight seal and there is no need to add the antifreeze. Your thoughts? Also, is Polyquat the only chemical I need to buy? I have bleach, chlorine, shock and Borax. Any recommendations where to buy the Polyquat? Thanks very much.