My inlaws pool needs dire help. I'm trying to help them out, I feel sorry for them because they are in their mid 80's and they cannot enjoy their pool. They have a hayward filter which for some reason the earth does not stick on the bottom 20% of the grids. It seems that there are some kind turbulence that is not allowing the earth to stick. When they first turn on the pump some earth is leak out to the pool and when they vacuum the you can see junk returning to the pool. I removed and inspected the grids/manifold/inlet oring around three times and I'm not making any progress. Thanks in advance! Glenn