Diatomaceous earth (DE) is the naturally occurring fossilized remains of diatoms, which are single-celled algae. This mineral has a small particle size, high porosity, and a crystalline structure, making it an excellent filtration medium for many applications, including pool water.

What is the purpose of DE in a pool filter?

Filtering your swimming pool water with diatomaceous earth (DE) gives you water that really sparkles. That’s because DE remove the tiniest of contaminants – particles as small as five microns (an average grain of sand is 1,000 microns!).

Do I need DE in my pool filter?

DE is added through the skimmer with the pump running. Each filter has a different requirement of DE. At initial start up or after a thorough cleaning, the filter will need to be pre-coated with DE. The filter label will state the amount of DE required.