I just bought a house with an inground pool. I have not had a pool before and need help. Live in the southeast and getting a lot of rain from Fay. The pool is almost ready to overflow and not sure how to get the excess water out? I was told when we bought the house the pool was put in about 11yrs ago and has a DE Filter system. I looked at it last night and seen several positions on the multiport valve. I seen rinse,backwash,waste,recir. .. Which one is best for me..