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Cartridge Filters (Diatomaceous Earth)
Cartridge filters are also popular with Canadian pool owners and may be known as diatomaceous earth (DE) filters. With these models, diatomaceous earth coats the filter grids and the pool water passes through it. Diatomaceous earth is actually a fine powder which is produced from the fossilized remains of diatoms, which are chemically inert sea organisms. The powder is placed in a cartridge filter which is made of corrugated paper or polyester cloth. When the dirt and debris starts to block the filter you just need to take the filter out and wash it off before reinstalling it. Some of the better filters can last for up to eight years before they need to be replaced.