Filtering up to 1.75 liters a minute without any
pumping, the high-capacity GravityWorks Water Filter System filter is
one of the easiest and fastest ways to get filtered water in the
backcountry.  The GravityWorks easily supplies filtered water for
drinking, washing up, cooking, and cleaning. Simplify your water
collection with the GravityWorks system and spend more time enjoying
your group.