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There are three popular methods of filtration - Sand, Cartridge, and Diatomaceous Earth (D.E). Sand Filters Cartridge Filters Diatomaceous earth is mined and is the fossilized exoskeletons of tiny diatoms. They are used to coat "grids" in the filter housing and act as tiny sieves allowing for the removal of debris as small as 5 microns. Once the pressure rises, the filter is backwashed just like a sand filter and then "recharged" with more DE powder. DE filters trap debris as small as 2 - 5 microns. |
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