GravityWorks(TM) 4.0L Water Filter System 4.0 liter
GravityWorks(TM) 4.0L Water Filter System 4.0 liter, Filtering up to 1.75 liters a minute without any pumping, the high-capacity GravityWorks 4.0L water filter is one of the easiest and fastest ways to get filtered water in the backcountry. Ideal for bigger backpacking groups or basecamps, the system has an 8 liter total capacity, easily supplying filtered water for drinking, washing up, cooking, and cleaning.