Just came home from a night away and the pool is full of mud. Neighbors indicated we had a horrendous rain storm last night. The one area of my backyard that is a bit lower than my other neighbors yard ran like a stream to my pool. You cannot see the bottom. I have poured in some floc and will wait and see if that helps. Anyone know what I should reasonably expect to pay to drain the pool and refill it? It's about 20 000 gallons. Oh, and can you shock while using floc? Thanks.