D.E. filters provide pool owners with the absolute best filtration available for your pool. A D.E. filter requires the filter media, Diatomaceous Earth, and can filter out particles down to just a few microns. The invention of a more cartridge-style filter vs. the older grid-type filters has made D.E. filters much more easy to clean and work with. If you want the best pool filtration possible, consider a D.E. filter.