Platypus GravityWorks 4 Liter Group Water Filtration System
Platypus and Tahoe Mountain Sports talk to Tahoe Rim Trail Guides about the quickest and easiest water filtration product for group backpacking and camping. The GravityWorks system from Platypus filters four liters in 2.5 minutes without any pumping.
Platypus GravityWorks 4L: http://www.tahoemountainsports.com/product/platypus-cleanstream-gravity-water-filter/
Platypus GravityWorks 2L: http://www.tahoemountainsports.com/product/platypus-gravityworks-2L-water-filter/