- Be sure that the suspected material on the pool floor is actually DE. Pollen, chemical residue and plaster dust often look like DE.
- You may have a tear in your filter elements, replace if necessary. Make sure that you assemble the internal parts properly!
- Check for air leaks, as this will cause the system to leak DE back into the pool. If there are air leaks, install a check valve between the pump and the filter valve.
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