I am in PA and it has been under 30 degrees the last few nights but tonight it is only going to be 47 and it was 70 degrees today. The water is 48 degrees. I drained the pool below the returns and plan on blowing out lines tomorrow. Tonight is the first night where I will not be running the pump. (because I cant anymore). Should I be concerned with anything at this point freezing wise (I doubt it...but ...sanity check ) ?