25 lb bag of white diatomaceous earth DE pool filter mediaAtlas Minerals & Chemicals Diatomaceous Earth DE Powder, 25 lb Bag, DEC25$3799
25 lb bag of white diatomaceous earth DE pool filter media

Atlas Minerals & Chemicals Diatomaceous Earth DE Powder, 25 lb Bag, DEC25

Ask a questionMPN DEC25
$3799
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Quick overview

  • 25 lb bag Enough to recharge a filter several times over a season on most residential pools.
  • White DE filter media The standard diatomaceous earth powder used in DE pool filters.
  • Catches the fine stuff DE filters down to a finer particle than sand or cartridge, which is why DE pools look sharp.
  • Added through the skimmer Mixed and poured into the skimmer after a backwash so it coats the grids.
  • The media, not the filter This is the powder that goes into an existing DE filter, not the filter itself.
  • Recharge after every backwash DE is lost with the backwash water and has to be replaced, or the grids run bare.
Full description and specifications ↓

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Product details

This is a 25 lb bag of white diatomaceous earth, the filter media added to DE pool filters. It is the powder, not the filter.

How a DE filter uses it

DE filters do not filter with their grids. The grids are a frame, and the diatomaceous earth coating laid over them is what traps debris. That coating filters down to a finer particle than sand or a cartridge can manage, which is why DE pools tend to look sharper than the rest.

Recharging

The coating leaves with the backwash water. After every backwash, the DE has to be replaced by mixing the measured amount with water and pouring it slowly into the skimmer while the pump runs. Skip it and the filter runs with bare grids, passing debris and wearing the fabric out early.

Getting the amount right

The amount your filter takes is set by its size, so go by the figure on the filter label or in the manual. A measuring scoop makes it repeatable rather than a guess.

Specifications
Brand Atlas Minerals & Chemicals Inc.
Manufacturer part number DEC25
Type Diatomaceous earth filter media
Form White powder
Size 25 pound bag
For DE pool filters
Shipping weight 25 lb
Ships Parcel

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Customer reviews

Questions and answers

What people ask about this product, answered by our pool techs.

What is this used for?
It is the filter media that goes into a DE pool filter. The powder coats the grids, and that coating is what actually does the filtering.
How is it added?
It is mixed with water and poured into the skimmer after a backwash, so the pump carries it into the filter and lays it onto the grids.
Do I have to add DE after every backwash?
Yes. Backwashing flushes the old coating out with the water. Running a DE filter with bare grids lets debris pass and shortens grid life.
Is there an alternative to DE powder?
Cellulose fiber and perlite are both sold as DE alternatives. This listing is the traditional diatomaceous earth powder.
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