A perfect solution for backpacking or group camping trips, the Katadyn Gravity BeFree Microfilter 6L is a lightweight, easy-to-use method for safely filtering water. It weighs just 8.9 ounces, packs down small, and filters up to 2 liters per minute! Eliminating the need for hoses or separate containers, the system integrates a 0.1 micron microfilter directly into the cap to remove bacteria and cysts, including Giardia and Cryptosporidium. No pumping is required and there is no need to allow time for purification to occur. Simply fill the durable reservoir, hang it up, and water drawn from the nozzle is immediately filtered and safe to drink. The filter's hollow fiber EZ-Clean Membrane can be easily cleaned at home without the need for backflushing, brushes, or other cleaning tools. Note: The EZ-Clean Membrane has a capacity of up to 1,000 liters, depending on water quality and the EZ-Clean Membrane Replacement Element (sold separately) can be purchased to extend the life of the system beyond that point.