This is my third winter with the pool, and the first year it ever froze solid. It is starting to thaw, and some areas have no ice, while other areas are still pretty frozen. I have water standing on the cover now, so my question is, should I pump it off now, or wait until everything unfreezes? Should I be concerned about jagged edges of ice if I lay my pump on the cover? Going to be about 60 here the next two days, then back below freezing for the weekend.