The MSR Autoflow Gravity Filter 4L is a very fast and efficient, no-pump portable water filter in an ultralight system.
The supreme ease of the MSR AutoFlow Gravity Filter has converted many backcountry travellers to pump-free water filtration. Now, it offers the luxury of effortless water storage and filtration in a more compact, lightweight and streamlined system. Efficient hollow fibre technology filters up to 1.75 litres per minute, and quick and easy tool-free cleanings maintain high flow rates on extended expeditions. Choose the 4-litre system for groups and base camps.
Tested: Meets NSF protocol P231 for removal of bacteria (99.9999%) and protozoa (99.9%) from beginning to end of filter life in “worst-case” water
No Pumping: Lets gravity do the work so you don't have to
Fast: Filters more than 1.75 litres per minute
Lightweight: 4-litre system weighs just 320g
Field-Maintainable: Can be back-flushed repeatedly without disassembly to regain flow rates
Adaptable: Filter directly into most any bottle or reservoir with included Universal Bottle Adapter