OK Not sure where to start. This is my first post and I would truly call myself a novice when it comes to pool care. I have been reading the site for a couple of weeks and have learned a lot but haven't found exactly what I am experiencing. When I vaccum my pool when I get to the dirtier areas I notice that the dirt (at least some of it) comes out of the drains and return holes? back into the pool. Can someone help me with where I should start looking and what my issue might be? Thanks.