Amazon.com This replacement filter is compatible with Katadyn's Hiker, Hiker Pro, and Base Camp microfilter systems, and provides up to 200 gallons of clean drinking water before it needs replacing. A removable filter protector helps extend cartridge life in extreme conditions, and a glass fiber element boasts an innovative pleated design, increasing surface area for improved filtration of silty or muddy water. Warranty All Katadyn products include a limited three-year 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." Product Description The Katadyn Hiker Pro replacement filter element is the replacement cartridge for Katadyn Hiker and Hiker Pro Microfilters. This replacement filter provides up to 300 gallons of clean drinking water before it needs replacing. A removable filter protector helps extend cartridge life in extreme conditions, and a glass-fiber element boasts an innovative pleated design, increasing surface area for improved filtration of silty or muddy water. Inside the core is activated carbon to improve the taste of the water.