The MSR AutoFlow Gravity Microfilter is a ultralight, pump-free way to filter your water in the backcountry. Gravity does the work, filtering approximately 1.75 liters per minute. Using MSR Hollow Fiber technology (the same technology used in the MSR HyperFlow Filter) AutoFlow is effective against protozoa, bacteria, and particulates.
Included with the filter is a 4-liter reservoir with a hanging strap, a quick connect hose with shut-off and a universal bottle adapter. It's simple and easy to use: just fill and hang the reservoir, and let gravity fill your bottle with filtered water. The AutoFlow can be cleaned repeatedly without disassembly for flow recovery. The AutoFlow Microfilter works especially well for groups and backcountry basecamps.