MSR MiniWorks EX Water Filter

Weighs 456g
Code: OC311
  • Now £94.99
  • (FREE Delivery on orders over £15)
Item out of Stock | Usually dispatched within 24 hours

Its durable ceramic element ensures protection pumps water for years and can be cleaned repeatedly for full recovery with no tools required for complete disassembly.

MSR says:

The MiniWorks EX microfilter is the worldwide best-selling microfilter, delivering long-lasting, field-maintainable water filtration in demanding environments. Engineered for frequent and heavy use, it utilizes our workhorse Marathon™ EX carbon/ceramic element to ensure clean, reliable and taste-free water. Thanks to its innovative AirSpring Accumulator™, it’s capable of pumping one liter per minute and the flow rate can be renewed easily and repeatedly in the field—no tools required. It’s lightweight and compact and, most importantly, been proven reliable by thousands of adventurers just like you.

This is certainly a rugged piece of kit and therefore suitable for long trips where reliability is a minimum requirement. Not the lightest filter on the market but we stock it because of its ability to screw directly onto the MSR Hydromedary water bladders and other containers with 63mm openings such as many wide mouth Nalgene bottles. Using the two products together means that water is filtered straight into the bladder without any spillage so there`s minimal hassle to restock with water.

We think that where water sources are fairly predictable some of the extra weight can be offset by carrying less water.

- Reviewed by Ultralight Outdoor Gear

Help and advice:  Info on Water Purification from Ultralight Outdoor Gear    
  • Testing: 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.
  • Reliable: Durable carbon/ceramic element ensures safe, taste-free water—even with frequent, heavy use.
  • Field-maintainable: Can be cleaned repeatedly for full filter recovery with no tools required.
  • Fast Flow: AirSpring Accumulator™ increases filtration speed; up to 1-liter per minute.
  • Better-tasting Water: Carbon core removes unpleasant tastes and odors caused by organic compounds, such as iodine, chlorine, and pesticides.
WARRANTY | This item comes with a product lifetime warranty. For more information see the MSR website.
  • Weight: 456g
  • Dimensions: 19 x 7 cm
  • Includes: Stuff sack hose float scrub pad and instructions


  • Effective against bacteria: Yes
  • Effective against chemicals/toxins: Yes
  • Effective against particulate: Yes
  • Effective against protozoa: Yes
  • Effective against viruses: No
  • Filter media: Ceramic Plus Carbon
  • Filter pore size (microns): 0.2
  • Flow (L/min): 1 liters per min
  • Flow (strokes per liter): 85
  • Cartridge life: 200 liters
  • Field cleanable: Yes
  • Field maintainable: Yes
  • Water Bottle Adapter: Yes
  • Cartridge replacement indicator: Yes
  • Material: Ceramic
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