A fiberglass pool professional is going to have to drain out more than half of the water out of my fiberglass pool to fix some cracks in the shell of the pool. We have really nice grass so I'm concerned about dumping out all of this pool water into the yard. Currently, my chlorine is at 4, CYA is at 50, and PH is at 7.8-8.0. Should I adjust anything before water is drained out to protect the grass from any damage?