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Aqua-Pro PP Spun Water cartridge filters of the SPUN line are made of expanded polypropylene. Aqua-Pro PP Spun large filtration area ensures the reduction of the number of cartridges High-quality replacement non-woven polypropylene sediment filter that fits any standard filter housings that use 40″x2.5″ filter cartridges and the required housing dimension. A cartridge is encased within a housing or a casing and used to remove unwanted particles, pollutants, and chemicals from liquids.