Wrong valve?

[RockingM]

New (to us) house...new (to us) pool. I have a de filter. My valve says "for sand filters only!"

Why is it that some valves are made only for sand filters?

What am I risking by leaving it in place?

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[jblizzle]

Generally the inlet and outlet filter pipes are opposite between sand and DE filters. Post up a picture showing more of the equipment and plumbing.