DE Filter keeps letting DE into my pool..

Nor sure what DE filter you have so please clarify that. On a Pentair DE there is a o-ring where the manifold attaches to the standpipe. Ensure that is in place and not cut. Also, there is an air bleed assembly on top of the manifold that has a screen, ensure that is in place and not damaged.

Are your grids seated properly in the manifold?
 
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