The sleek, foldable Katadyn BeFree Gravity 6L filter system uses gravity to get the freshest, cleanest water you can always trust. The heart of the BeFree Gravity 6L 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 that safely removes bacteria, cysts, and sediment with a 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. The capacity of the filter is up to 1000L, depending on water quality. To clean the EZ-Clean Membrane™, just shake or swish it in water in the field or at home. Filtered water can be stored in a separate container, bottle, or hydration bladder. The opening of the container, bottle, or bag for filtered water should be as small as possible to prevent dirt from getting in.