I'm having the same problem with my DE filter.
I have an old Pac Fab Nautilus.
We replaced the grids and still got DE in the pool. I don't know how your filter is built but with ours..a manifold sits on the top of the grids and over a pipe. You can lift the whole unit, grids intact.. out of the filter container. As it lifts off the pipe it has a tendency to bring the rubber O ring with it. When we went to inspect the o rings, that one was gone. AND our strainer for our air relief tube on top of the manifold (inside the filter container) had a tear in it.
We ordered a new one (leslie's replacement had much larger holes) and we're hoping it clears it up completely.
We only get a tiny bit of DE dust on the bottom of the pool now...where before it was a LOT of DE. Each fix has brought us closer to not having any DE in the pool. I'll repost after the new strainer for the air relief tube is installed.
I'm interested to see what your problem is...
Good luck!
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