The sleek, foldable Katadyn BeFree Gravity filter system uses gravity to get the freshest, cleanest water you can always trust. The heart of the BeFree Gravity is the EZ-Clean Membrane, offering a fast flow rate of up to 2 liters per minute. The water passes through a hollow fiber filter which safely removes bacteria, cysts and sediment with its pore size of 0.1 micron (0.0001 mm). Thanks to the water level indicator window, it is clearly visible when refilling is necessary. The practical carrying strap allows you to haul a full filter back to camp effortlessly, where it can be hung in a nearby tree. The output hose can easily be removed using a quick-release valve with automatic flow-stop, to prevent contact with contaminated water when refilling.