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MSR Autoflow Gravity Microfilter 4L (2017)


The MSR Autoflow Gravity Filter is a step forward in portable water filter design. Combining the 3 facets of water collection, storage and, of course, filtration, the Autoflow Gravity Filter also requires no pumping, making it the ultimate lightweight and highly packable water filter.

With the latest Hollow Fiber technology and the power of gravity, the AutoFlow micro filter is as fast as it is as fast as it is versatile - filtering well—up to 1.75 litres per minute without a single pump stroke. The 4-liter reservoir allow you to filter large quantities at once making it perfect for groups, while quick and easy tool-free cleanings maintain high flow rates on extended expeditions.


  • Effective against protozoa: Yes
  • Effective against bacteria: Yes
  • Effective against viruses: No
  • Effective against particulate: Yes
  • Effective against chemicals/toxins: No
  • Weight: 315 g
  • Width: 10 cm
  • Filter media: Hollow Fiber
  • Filter pore size : 0.2 microns
  • Flow: 1.75 litres per min
  • Cartridge life: ~1500 liters
  • Field cleanable: Yes
  • Field maintainable: Yes
  • Water Bottle Adapter: Yes


  • Manufacturer: MSR
  • Weight: 392g


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