Diatomaceous Earth....how much?

Her pool boy

Well-known member
May 19, 2016
St Catharines, Ontario, Canada
Pool Size
Liquid Chlorine
I would like to add some DE to my sand filter and am wondering how much? The smallest bag I can get from the pool store is 10lbs. I read the article on DE and it explains how to add it well enough but I am a bit more confused about how much to add and when to stop adding it. How many pounds should I expect to use ? Is the end game to add 1 PSI to my filter pressure and then stop adding? And if so, at what pump RPM? Any further tips, tricks or advise is much appreciated.




Mod Squad
Gold Supporter
LifeTime Supporter
Jan 17, 2012
Evans, Georgia
As the directions for adding state.... start slow and note your initial pool filter gauge reading. Add say, 1/2 cup... wait 5 minutes or so and go see if your pool filter gauge raised any? If 1ppm increase, stop adding. If it didn't increase, add a little more and recheck.

My pool takes about 3/4 cup.

I have a single speed pump so I can't comment on your ideal speed.

Maddie :flower:
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