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MSR MiniWorks EX Water Filter

The compact MSR MiniWorks EX water filter with EX technology has been proven reliable by thousands and thousands of adventurers around the world.
  • $89.95

Item # 695265

REI Members get back an estimated $9.00 on this item as part of their annual member refund.

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  • details
  • specs
  • reviews
  • q & a
  • Ceramic/carbon Marathon™ EX element effectively removes bacteria and protozoa including giardia and cryptosporidia
  • Also removes unpleasant tastes and odors caused by organic compounds, such as iodine, chlorine and pesticides
  • Filter can be cleaned over and over for maximum field life with no tools required
  • AirSpring Accumulator™ increases filtration speed up to 1 liter per min.
  • Bottom screws onto an MSR Dromedary® Bag or Nalgene® water bottle for easy operation (both sold separately)
  • Easy disassembly lets you troubleshoot and maintain the MSR MiniWorks EX filter in the field

Weight reported dry, without accessories.

Made in USA.

MSR MiniWorks EX Water Filter

Specification Description
Best use Backpacking
Filter type Pump
Filter medium Ceramic with carbon core
Removes/Destroys Protozoa and bacteria
Pump force 10.4 pounds
Pump strokes per liter 85
Output 1 liters per minute
Housing material Polyurethane
Field cleanable Yes
Dimensions 7.8 x 3.8 inches
Weight 14.6 ounces

MSR MiniWorks EX Water Filter

Loading Ratings & Reviews...

Rated 1out of5
by frombroke in backcountry I purchased this filter after significant research and was surprised to find the product malfunctioned on day 2 of 11 days in back country trip in Wyoming. Even folks we ran into on the trail familiar with the model could not figure out what had gone wrong. One couple said they had had problems with their MiniWorks in the past and bought the Water Works to replace it (which they liked). Luckily, we had enough iodine to keep drinking safe water (always bring more than enough iodine!). [...] I was very disappoint with the MiniWorks and would not recommend it. There are less fancy but more dependable water purifiers out there.
Date published: 2007-11-18
Rated 1out of5
by frompoor filter. disappointed in MSR My guide service bought these for all of their leaders. On my first trip out it clogged in mostly clear water. I attempted to clean it with the brush and it moderately improved performance. After trying it for a few weeks I went back to my MSR SweetWater. I found it much easier to pump and clean. Too bad MSR didn't put what they learned from the SweetWater to the MiniWorks.
Date published: 2007-12-07
Rated 1out of5
by fromNo longer functioning This unit broke down on me in the backcountry. Fortunately there were other backpackers who let me filter some water by the time I got to the lake. I don't know what I would've done if this was a more isolated trail. This is a disappointing product by MSR.
Date published: 2008-03-13
Rated 1out of5
by fromBuilt to Break I had this unit out on my first trip and it broke. It began spewing water from the connection to the nalgeen bottle and my MSR blader. The bladder is awesome I got a two litre but the filter is horrible. Almost everyone I've spoken to that has owned one for any decent period of time said that this filter has problems. My friend has constant issues with ceramic filter cracking. I am going to try out the Vario by katadyn.
Date published: 2008-09-07
Rated 1out of5
by fromSave your Money - or bring tablets also I have had two of these and they both failed me on a back country adventure. Fortunately I learned my lesson after the first pump failed and started packing purification tablets. Great concept - inferior product.[...]
Date published: 2011-02-27
Rated 1out of5
by fromBad luck with MSR I've had two MSR filters now and both of them have died not long after first using them. The mini is hard to pump. The one thing I appreciate about the filter is your ability to clean the ceramic filter...that said, what good is it if the pump fails? I went to a katadyn and found it much more easier to pump and much faster output.
Date published: 2011-05-09
Rated 1out of5
by fromWorst Filter Ever I bought this last fall from REI. I had been using the Katadyn Hiker Pro, but I liked the handle on this one. Upon getting it home, I familiarized myself (a few test runs in a sink just to make sure it worked, and I knew what I was doing) with the filter, and was quite happy with how easy it was to operate. I took it with me on a canoe trip, and it failed miserably. Luckily one of my friends had brought a filter along as well. I have taken it on two trips since then (each time taking it apart and cleaning it out upon returning home) and the SAME problem has cropped up every time. The spring does not provide an adequate seal on the hose, and instead of forcing the water through the ceramic filter, the water is just pushed back down the hose. It will trickle out roughly 4 oz of water every ten minutes. This filter is NOT worth the time and effort, and I'm going back to Katadyn.
Date published: 2011-07-04
Rated 1out of5
by fromBroke on first day Sadly, after 7 years of putting off the purchase of what I considered to be one of the best (well-known anyway) filters on the market, I was let down. My 16 year old cousin, who has a form of diabetes that requires him to drink 2 gallons of water a day without being in the sun drove up from Bakersfield for a 4.5 day rafting trip on the John Day river in OR. I purchased this filter specifically because it claims to be the most field serviceable (and thus dependable) filter on the market and we COULD NOT be left without some way to treat the water. Obviously, this occurred. After following the instructions and running several gallons of tap water through the filter at home prior to field use, this filter lasted about 1 gallon on the river before the seal that is responsible for the suction action failed. Even more disappointing is the fact that we could not access this seal to attempt to "field service" the failed component. (or at least we couldn't figure out how to - it is in the hard plastic section that the handle initial pushes/pulls) I am sure that REI will stand behind their pledge to take back what was a brand new filter, but this does NOTHING to remedy the problems we faced in the field due to this filter failing. I will also be relaying this message to MSR and will report back with another review with any response I receive. A major disappointment. I will go ahead and just purchase the $40 replacement filter for my Katadyn and suck up the fact that I will have to carry a backup replacement filter for that on any multi-day trips in the future.
Date published: 2011-08-02

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