My DE filter is allowing DE to go back to the pool. I have done the following.
1. Inspected grates and no rips/tears or cracks.
2. Properly install new rotor seal on the rotor valve.
3. big and small o rigs replaced.
4. Air Relief Strainer and tube checked and good to go.
5. Manifold check and no cracks
I am still do not understand what the problem is. I called pentair but the engineers were not around to help.
Included is one images that tell part of the story.