CLEANER TASTING DRINKING WATER ON ANY ADVENTURE: The Katadyn Carbon Cartridge polishes already-filtered water by absorbing chlorine, chemicals, and odors for fresh, great tasting hydration on camping, backpacking, hiking, and international travel. ACTIVATED CARBON ABSORBS CHEMICALS AND IMPROVES TASTE: Reduces chlorine, pesticides, herbicides, and bad odors while leaving essential minerals in the water. Up to 200 liters of cartridge life depending on source water quality. FITS BOTTLES AND HYDRATION PACK BITE VALVES: Bottle adapter sits on top of most popular bottle brands. Outlet barb connects to the hose of most popular water filters. Barb also fits bite valves on most hydration packs for easy filling. REPLACE EVERY 6 MONTHS OR EVERY 200 LITERS: Snap the adapter onto your filter outlet hose or bottle, run filtered water through, and swap in a fresh activated carbon cartridge every 200 liters or 6 months for consistently clean tasting water. TRUSTED SINCE 1928: Katadyn has been delivering clean water solutions for nearly a century. Used by hikers, travelers, and professionals worldwide, our products are built for reliable performance wherever you go.