Convenience is everything when family camping at the beach, or rafting for days down the Colorado River. The Katadyn Base Camp H2O Filter offers an accessible way to treat large volumes of H2O. No pumping is required. Just fill the H2O bag and hang; gravity is your friend. The Base Camp Filter uses the cleanable Hiker PRO cartridge, which contains a pleated glass fiber element that removes bacteria, protozoa and cysts from the drinking H2O.