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Keystone Filter manufactures a wide variety of replacement cartridges that are interchangable in virtually every style of nominal 23/4" diameter cartridge filter housing. Cartridges are available in a variety of materials including cellouse, activated carbons, microfiberglass and polyproplene. Keystone's ALL-PPRO pleated cartridges feature all polypropylene construction in nominal ratings from 0.2 to 50 micron, with end caps that will fit all standard and sanitariy style housings. Pleated cartridges are stocked in single and contineous multiple length configurations. Activated carbon cartridges are available in convolutely wound or granular filled constructions.

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