Diatomaceous Earth (DE)



How it works:
Able to trap anything larger than 2 microns, this type of filter gives you the cleanest pool water out of the four types. Diatomaceous earth, the medium used in this filter, is made up of fossilized remains of a type of hard-shelled algae, and each grain has microscopic holes running through it to trap even the finest particles. DE filters have internal elements that become coated with DE. It is this ‘filter cake’ that strains dirt, dust, algae, and some forms of bacteria from the water


  • Filters down to 2 microns
  • Large surface area requires less maintenance

Needs to be backwashed as well, though not as often as sand filters

  • Costs to replace DE each time you backwash it

Time and effort to replenish the DE powder in the filter

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