Ceramic replacement cartridge for Katadyn Pocket filter. "The Katelyn pocket replacement water Filter element is silver-impregnated Ceramic, which prevents bacteria and protozoa growth. The Katelyn pocket camping water Filter element is also easy to clean whenever and wherever. Katelyn pocket micro Filter replacement camping Filter removes particles, cysts and parasites 0.2 microns or larger. From mountaineering base camps to international aid stations, Katadyn water filtration products offer an ideal potable drinking water solution for people on the move in the great outdoors. The Pocket ceramic replacement element has been on the market for more than 30 years, and offers rugged, long-lasting micro-filtration. A proprietary, cleanable, silver-impregnated ceramic element has remarkably long life, and is capable of filtering up to 13,000 gallons of water. Lifetime Warranty This Katadyn product includes a limited lifetime manufacturer's warranty against defects in materials and workmanship. About Katadyn Water treatment products are in high demand for outdoor enthusiasts, international travelers, relief groups, and preparedness-minded individuals. The Swiss company Katadyn provides users with a water system for every need, including traveling, camping, backpacking, sailing, paddling, fishing, biking, and anytime you need to, as the company says, "make water drinking water."