Katadyn Pocket Water Filter Replacement Cartridge Pocket Micro filter Removes particles, cysts and parasites Silver impregnated ceramic Genuine OEM Product Easy to clean Katadyn water filtration products offer potable drinking water solution for people on the move in the great outdoors Pocket ceramic replacement element has been on the market for more than 30 years Offers rugged, long-lasting micro-filtration Proprietary, cleanable, silver-impregnated ceramic element filters up to 13,000 gallons of water Includes limited lifetime manufacturer's warranty