I closed my pool about a week ago. I blew all the lines, and plugged them. I blew the skimmers, put a plug in one, and a gizmo in the other because I couldn't get a plug to work. I dropped the water level to just below the skimmers, vacuumed the water out of the skimmers, and put a jug in the one with the plug, and pool noodle pieces in both. I covered the skimmer lids with a piece of old liner to keep the rain from filling them up after i put antifreeze in each. When I tried to blow the main drain, it never bubbled. I shut the valve on the main drain, turned off the blower, then opened the valve back, and could hear air coming back out from the water pushing back into the main drain. I poured two gallons of antifreeze into the main drain and turned the blower back on. I never saw pink coming out of the main drain. I closed the valve and figured the amount of air I pushed back down the main drain, plus the two gallons of antifreeze would be plenty to keep it from freezing. Anyone agree or object to this? I would've used my compressor to blow the main drain, but its 240v, and I would either need to make a 150ft extension cord, rig up something at the pool pad, get another 100ft of air hose, or drag it all the way to the pool and use what air was in the tank to blow the line. None of which would be an easy task. What say ye?