I live in Oklahoma, the weather changes quicker than you can blink. We had a relatively mild winter, now we have highs that are hitting in the 80's and dropping back down into the 40's the past week or so. The pool was drained down to about 6" below the skimmer at closing. The cover is still on. I did a quick clean of the filter prior to closing. My question, what issues do you all think I am looking at when I open? I am thinking about doing it this weekend or next. Thoughts? Have a 12k IG pool with a Pentair 36 DE filter.