My 7 year old pool, sadly to say, has received only the attention required to keep it usable. That considered, it is in pretty good shape. For the last few years, it has not actually been closed and covered. This year, I plan to cover it, mostly because of the many leaves that fall into it. I need to know what to do to it prior to covering. Freezing is not a normal condition here, so I do not need to "winterize". Any suggestions?