Hello i have recently moved into a house with a an in ground pool. It seems like the house has been vacant for awhile and the pool hasn't been touched for a decade. I have no idea what to do about the pool. The water was tested at a pool store and they said everything looks good. I don't know any of the information i am supposed to give. But we did shock it, backwash, and put that stuff that should make everything go to the bottom to be vacuumed but nothing worked. What should i do and how should i start?