Katadyn Gravity BeFree Water Filtration System with EZ Clean Membrane, 3 LitersThe Katadyn Gravity BeFree Water Filtration Systems revolutionizes the way adventurers access clean water. This state of the art system uses a 0. 1 micron water filter, eradicating 99. 9999% of bacteria and 99. 9% of protozoa like Giardia & Cryptosporidium, exceeding even EPA standards. Its design includes a collapsible Hydrapak Soft Flask that's both space efficient and durable. The system's unique EZ Clean Membrane can be maintained effortlessly. By