Adding Diatomaceous Earth to a sand filter

ChristyC

New member
Apr 22, 2025
2
Delaware
Hi,

We recently bought a house that has an above ground pool. It has been 10+ years since I have owned a pool.

The pool was not in operation during at least the 2024 season. I have no clue of how long the sand has been in the filter, so I am going to replace it. I have been reading that it would be beneficial to add Diatomaceous Earth.

The pool is a round 18 x 52". I believe I read on the filter that it requires 100 pounds of sand. How much Diatomaceous Earth would I add, and how do I add it?

Thank you so much!
 
Welcome to TFP!

For clarification: DE can be added to a sand filter that's already in service with the appropriate amount of sand. It is a temporary filter aid that is expelled from the filter on the next backwash cycle.
 
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