Our Aquabot seems to vacuum well but a little while after it is done running the pool looks worse than when it started. It leaves real fine dirt all over the bottom of the pool. I even purchased BotBags because I thought maybe the one that came with it wasn't any good but it does basically the same thing. The bags do have some dirt in them so they seem to be working. I make sure the bag is on correctly and pulled tight against the top. Any ideas?