Diatomaceous Earth (DE) Filters for Swimming Pools

Achieve the clearest pool water possible with a diatomaceous earth (DE) pool filter — the gold standard in residential pool filtration. DE filters capture particles as small as 2–5 microns, far surpassing the 10–15 micron capability of sand filters and the 5–10 micron capability of cartridge filters. PST Pool Supplies stocks DE filters from Hayward and Genesis in sizes from 20 to 65 square feet, starting from $610.

Hayward's Perflex DE filter series (EC40AC, EC65A, EC75A) uses a bump-style cleaning mechanism — instead of full disassembly for backwashing, you simply push and pull the bump handle to redistribute DE powder and extend time between full cleanings. The Perflex design is particularly popular for pools with limited backwash water disposal options. Hayward's ProGrid DE filter series (DE3620, DE4820, DE6020) uses a traditional manifold-and-grid design with a multiport valve for standard backwash operation — the most common DE filter configuration for residential pools. The Genesis 48 sq ft DE filter (GP570004807) is a quality alternative with a 2" FPT multiport valve (GPWVD001) available as a matched set. For grid assemblies and DE filter parts, including Val-Pak and Anthony Apollo replacement grid assemblies, browse our filter parts collection. Hayward filter documentation is available at Hayward's official filter support page.

Selecting the right DE filter size depends on your pool's volume and flow rate. As a general guideline, DE filters should be sized at a turnover rate of 1 gpm per square foot of filter area — a 20,000-gallon pool running a 60 gpm pump needs at minimum a 36 sq ft DE filter, but upsizing to 48–60 sq ft significantly extends time between cleanings. DE filters require adding fresh diatomaceous earth (DE powder) after each backwash — approximately 1 lb of DE per 10 sq ft of filter area. Never backwash a DE filter and then restart without re-coating the grids with fresh DE, as bare grids provide almost no filtration. DE powder is available in our pool chemicals collection. Per EPA guidance, spent DE should be disposed of in accordance with local solid waste regulations — do not discharge backwash water containing DE to storm drains.

Shop DE pool filters and experience the crystal-clear water quality that only diatomaceous earth filtration can deliver.