What Our Gearhead(R) Experts Are Saying:"This replacement filter is a game-changer for keeping my BeFree system running smoothly. The EZ-Clean membrane makes maintenance effortless, and I love how quickly it filters water. It's a lightweight and reliable solution for clean hydration no matter where I go."When clean water is a top priority, the Katadyn Explorer Virus Membrane Replacement Cartridge keeps us hydrated and worry-free on the trail. Designed for all blue Katadyn BeFree Water Filtration Systems, this 0. 1-micron filter removes bacteria, cysts, and sediment with ease, ensuring safe, refreshing hydration in the backcountry. The EZ-Clean Membrane(TM) takes the hassle out of maintenance, allowing us to restore performance with just a quick shake or swish. With a flow rate of 2 liters per minute and a lifespan of up to 1,000 liters, this lightweight replacement cartridge is built to keep us going strong on multi-day treks and backcountry missions. Whether we're filtering water from a mountain stream or a desert spring, the Explorer Virus Membrane Cartridge is ready for the challenge.