MSR AutoFlow 4L Gravity Filter
MSR (Mountain Safety Research)Item# 097359
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Updated for 2017: The supreme ease of the AutoFlow Gravity Filter has converted many backcountry travelers 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 fiber technology filters up to 1.75 liters per minute, and quick and easy tool-free cleanings maintain high flow rates on extended expeditions. Choose the 4-liter system for groups and base camps. The 2-liter system is perfect for backpacking pairs.

  • 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 liters per minute.
  • Lightweight: 2-liter system weighs only 300 g (10 oz.). 4-liter system weighs just 315 (11.1 oz.)
  • Field-Maintainable: Can be backflushed repeatedly without disassembly to regain flow rates.
  • Adaptable: Filter directly into most any bottle or reservoir with included Universal Bottle Adapter.
  • Assembled in the U.S.A. of U.S. and Imported Materials.
  • Product Specs
    Weight (Standard): 11.1 oz
    Dimensions (Standard): 20 x 11.3 in
    Style: 9590
    COLOR SIZE MFG # UPC UID
    0959004081809590498383