I am in the eastern part of NC, and have a new IG vinyl pool. The water temp is around 60-65 degrees. I am down to running my pump about 2 hours a day and don't even run the polaris cleaner. I have no leaves or debris I need to worry about. There are a couple of worms on the bottom and some sand I can see. Should I even bother with a full closing (blowing out the lines, etc?) or just leave it open? I have no main drain, and was thinking about draining below the 1 skimmer. Any thoughts?