Some of you may remember that I was trying to gain a little big more heat at the beginning and end of our season. I bought one of those clear, heavy-duty, 12 mil solar covers with the diamond shaped bubbles. I noticed a difference at first--got a small heat gain right away and much better night time insulation. But then...6 months later, it is literally crumbling. I pulled it out of the pool to wash the dust off after winter, and every time I grabbed an edge to pull, it came off in pieces. I know these things don't last longer than a year or two, but REALLY? Six months? This one wasn't cheap, either. Trying to find the paperwork now to see if I have any recourse with a warranty.