My CYA level is up around 250 or 300 so I need to do a major drain and refill. I'm also trying to get some bids on some surface rapairs (piece of rebar sticking up through a step, etc) so it would be nice to only drain once. I have a Pebbletec pool. Is it safe to drain it right now given that the temps are over 100 degrees and headed to 110 in a few days? I've heard that draining during the Summer can lead to cracks.