I'm a new pool owner (just bought the house two weeks ago). We live in Maine where things start to freeze sometime between Thanksgiving and Christmas, with an average annual snowfall of 71". The seller of the home told me that every fall after the leaves have fallen, but before freezing hits, he drains the pool to about halfway. Then he apparently left the pool alone - didn't cover it, add anti-freeze, or anything. He was under the impression that covering the pool up here is what causes pool cave-ins or warped walls. Then with snow melt and rain, he says he's got a full pool by spring time. Does this make any sense to you all? He's been doing this for probably 10 years, but I'd love some extra opinions. Thank you!