1. How much psi for blowing out the lines with an air compressor? I tried 20PSI and had a some very small air bubble leaks at the plugs. I think because of the amount of pressure.
2. In the past I blew out the return lines and capped them off under the water line. I read in pool school about drain the water below the returns and adding antifreeze using a curved funnel. So, Just blow out line (turn off air pressure?) add half a gallon of antifreeze, and then cap them off? Thanks for the help.