Dirt on your filter does NOT cause vacuumed dirt to return to the pool via the pool returns.
There is ONLY one reason for this to happen: dirty water is bypassing the filter. There ARE several ways that can happen:
1. There are holes in your DE membranes (but then, DE will ALSO shoot into the pool after backwashing), OR
2. Something internal to your filter system OR your filter valve is allowing dirty water to bypass the filter, OR
3. You've got piping or a valve that allows dirty water to bypass the filter.
Cleaning your filter won't fix any of those -- though it's possible that if you disassemble the filter, clean it, and then re-assemble it, you may inadvertently correct the problem.
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