Instead of draining all the water & taking it down, I left it up with about a foot of water in it. The crappy pool cover that came with it just wouldn't stay on, so we forgot about it. The water is terribly dirty, should I drain all the way or refill & clean it. I've invested this year in a higher performance sand filter & a chlorine/algaecide generator so cleaning shouldn't be a problem, i just wonder if there's something i'm overlooking. Also, where can I get a decent cover, because when I put that cheap one on the wind would immediately catch under it (no matter how tight) and blow it right off.