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Hands-on Gear Review

MSR Miniworks EX Review

Backpacking Water Treatment

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Price:   Varies from $87 - $90 online  —  Compare at 5 sellers
Pros:  Effective against chemicals and toxins as well as bacteria and protozoa, longest filter life of all reviewed (2000 liters)
Cons:  Heavy, ceramic filter needs to be cleaned often, takes muscle to pump
Editors' Rating:     
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Manufacturer:   MSR


For the frequent backcountry traveler, the MSR Miniworks EX is a long-lasting filter with the added benefit of cleaning chemicals and pesticides from water. It is on the heavy side for a hiker, and requires slightly more time and force to pump than any of the other pump filters. However, it treats more than twice as much water as many of the other pumps at its price point, treating 2000 liters before a replacement cartridge is needed.

If you prefer a lightweight model for long distance hiking, check out the Sawyer Mini or the SteriPEN Journey LCD. If you need your water treatment to purify for viruses, check out the MSR Guardian, which is even heavier and more expensive, but effective against more pathogens.

RELATED: Our complete review of backpacking water treatment

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Analysis and Hands-on Test Findings

Review by:
Jessica Haist
Review Editor

Last Updated:
August 10, 2016
A long-lasting ceramic filter, the Miniworks is a decent choice for large groups or organizations that need a filter to last over the course of many trips. It is on the heavy side for backpacking, but works well.

Performance Comparison

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The Miniworks screws onto the top of a Nalgene bottle for ease of use and added stability while pumping.


This water filter is a workhorse filtration system. The ceramic filter with a carbon core is effective against bacteria, protozoa, and cysts as well as chemicals, herbicides, and pesticides. This ceramic filter is good for up to 2000 liters of treated water, which is more volume than almost all other system we reviewed. This makes this filer reliable for a greater length of time than any of the others.

Ceramic filters last by far the longest of any other filter media, and this is the only ceramic filter in this review. They may require frequent cleaning if they becomes clogged, but the filter itself will last longer than any of the other filters we reviewed. This is the main issue with this filter, that there is more regular maintenance required than any other filter in this review and it is annoying to have to clean the filter unit regularly. We prefer the very low maintenance MSR AutoFlow Gravity Filter for high volume trips.

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The long lasting ceramic filter of the Miniworks can take many cleanings before needing to be replaced.
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The long lasting ceramic filter and the included gauge. This filter can filter around 2000 liters before needing a replacement cartridge.

Ease of Use

This filter is easy and intuitive to take apart and put together for maintenance wherever you are. It is field cleanable, and comes with a green scrubby to clean the filter and a gauge to measure the filter's life to make sure you haven't scrubbed the filter down too much for it to be effective.
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The Miniworks, taken apart for cleaning.
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The Miniworks is field maintainable, meaning it is easy to take apart and clean while out hiking.

The handle is beefy and thick, which is good for pumping, but it requires noticeably more force to pump than any of the other pump-filters like the MSR Guardian.

The Miniworks filters out chemicals as well as pathogens, so it helps to improve the taste of water. It can even remove chlorine or iodine flavors if you treat with one of those methods beforehand to eliminate viruses.

Personal Stories

After polling other people who have used the Miniworks, we got this reply from a frequent camper and hiker, Andrew Reisert, who has owned this filter for around five years:

"It works like a champ. A tad heavy, and the ceramic filter can crack if it freezes overnight. Certain situations I've run into aren't so great though. Like on the Olympic Coast all the tannin in the water made me clean it between every liter or so. Also in the Yucky Kentucky, but then I also was pumping for two other people."

Treatment Capacity

As we mentioned, the filter has a long life and can treat up to 2000 liters in it's lifetime. As with many of the other traditional pump filters we've tested, the MiniWorks can only pump so fast. It is not a great choice for big thirsty groups, as it takes up to two minutes to pump out a liter. Thirsty hikers will be waiting a long time to drink if you're in a large group and only have this filter to fill everyones bottles.
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Andrew Reisert filtering water in Mt. Rainier National Park. The ceramic filter in the Miniworks has a long life (2000 liters), but it does require occasional cleaning.


Since this filter is the hardest to physically pump, it took around 30 seconds longer (two minutes) to pump a full liter than any of the other filters, but still does not require a long wait like the chemical treatments.


Tipping the scales at 18 ounces, weight is the biggest downside to the Miniworks. It is the second heaviest filter, to the clunky Guardian. This makes it not the most ideal filter to carry with you on a backpacking trip. If you don't mind the weight, another filter of similar weight that we prefer is the Katadyn Vario.
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The MiniWorks isn't that mini and doesn't work the best of all the filters we tested.

Best Application

Because this is a heavy filter, it is not the thru-hiker's or ultra-light backpacker's choice. For other camping trips or shorter hikes, particularly for the frequent outdoor dweller, it is a reliable and economical choice. If you are purchasing a filtration system that you plan to use a lot and for a long time, this is the best choice.


This contender is the best value for heavy use. At $89.95, it is average in price, costing less than the Guardian or the SteriPEN Ultra. However, since the Miniworks has a ceramic filter it can filter for over 2000 liters of water before needing a replacement. Similarly priced filters such as the MSR Sweetwater and Katadyn Hiker Pro only treat 750 liters before needing a cartridge replacement, which usually costs around $40, or half the price of a whole new filter. New ceramic cartridges also cost around $40, but need to be replaced much less often. With the long-lasting Miniworks, you can treat the most water for the least amount of money.
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Andrew Reisert using the Miniworks in Mt. Rainier National Park.


The Miniworks is a time tested pump filter, but we think it is falling behind the times. Yes, it lasts a long time with a constant amount of maintenance, but we prefer the faster and simpler gravity filters like the AutoFlow and Platypus GravityWorks, our Editors' Choice winner. The Miniworks is heavy and slow, two things that are unforgivable to most backpackers.

Other Versions

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MSR Hyperflow Microfilter
  • Cost - $100.00
  • Weight - 7.8oz
  • Flow - 3 liters per minute
  • Strokes per liter - 20

MSR SweetWater Microfilter
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  • Cost - $90
  • Earns out Top Pick award
  • Weight - 11 oz
  • Flow - 1 liter per minute
  • Strokes per liter - 75

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MSR AutoFlow Gravity Filter
  • Cost - $120
  • Weight - 14.6oz
  • Gravity fed water filtration system
  • Treat and store up to 4L of water
  • Durable DromLite material


MiniWorks/WaterWorks EX Ceramic
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  • Replacement ceramic filter
  • $40

Miniworks Replacement Hose
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  • $15
  • Replacement for your inlet hose

Miniworks Waterworks Maintenance Kit
  • $20
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  • Comes with a few great tools to clean your Miniworks
Jessica Haist

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OutdoorGearLab Member Reviews

Most recent review: August 10, 2016
Summary of All Ratings

OutdoorGearLab Editors' Rating:   
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Average Customer Rating:     (0.0)
Rating Distribution
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5 star: 0%  (0)
4 star: 100%  (1)
3 star: 0%  (0)
2 star: 0%  (0)
1 star: 0%  (0)

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