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MSR MiniWorks EX Backountry Water Filter

4.6 4.6 out of 5 stars 1,527 ratings

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Purchase options and add-ons

Material
Ceramic
Capacity
2000 Liters
Included Components
Microfilter, Hoses, Caps
Purification Method
Ceramic Filter Medium

About this item

  • Microfilter water filter pump for hiking, backpacking, camping, travel, survival, and emergency preparedness
  • Replaceable carbon and ceramic filter removes bacteria, protozoa, organic compounds, and particulate, delivering clean, taste and odor-free water
  • Pumps at a rate of one liter per minute; compatible with a variety of wide mouth water bottles, and hydration bladders (sold separately)
  • Meets NSF protocol P231 for removal of bacteria (99.9999%) and protozoa (99.9%); one replaceable filter cartridge treats up to 2,000 liters of water
  • Pump measures 7.5 x 2.75 inches and weighs 1 pound; storage bag included; manufacturer’s limited lifetime warranty; made in the USA

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From the brand


From the manufacturer

MiniWorks Header

Mountain Safety Research

MSR has always been a company of engineers, inventors and unruly dreamers. Larry Penberthy started the company in 1969 on a personal crusade against unsafe equipment. Today, we’re still an intrepid team obsessed with creating the most reliable, high-performance gear possible.

Whether it’s defying the status quo in equipment design or radically shifting the social mindset, we believe the greatest innovations—and explorations—are inspired by the world’s unruly dreamers.

Photo By: Scott Rinckenberger

MiniWorks Microfilter

ceramic filter

MSR water Lab

Fast Flow

Better-Tasting Water

Reliable

Durable carbon/ceramic element ensures safe, taste-free water—even with frequent, heavy use.

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.

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.

Water Lab

MSR Purifiers & Microfilters

From our fast-and-light microfilters to our gravity-powered systems, we apply the latest technologies and rigorous testing to assure you safe water on every adventure.

water lab

Safe Water Starts With Science

We invest in an on-site water lab with staff scientists, and individually test our devices to ensure they deliver greater safety and ease of use.

Every MSR filter and purifier features:

  • An integrity check that allows the user to easily confirm that, if the device is dropped or frozen, the fibers haven’t been damaged and the device is working safely—a feature most competitors don’t provide.
  • An end-of-life indicator—the filter media stops passing water. This clearly identifies that it’s time to replace the cartridge without exposing the user to harmful pathogens.
  • Passes NSF Protocol P231 throughout the filter’s life. The test confirms microbiological threat removal from a variety of water types, unlike NSF 42 and 53, which aren’t suitable tests for backcountry use.

MiniWorks Miniworks Purifier Guardian Trail Shot AutoFlow Guardian Gravity
MiniWorks EX Microfilter MiniWorks EX Purifier Guardian Purifier TrailShot Microfilter AutoFlow XL Gravity Filter Guardian Gravity Purifier
Customer Reviews
4.6 out of 5 stars
1,527
4.6 out of 5 stars
211
4.6 out of 5 stars
442
4.6 out of 5 stars
945
4.7 out of 5 stars
55
4.5 out of 5 stars
71
Weight 16 oz 16 oz 17.3 oz 5 oz 12 oz 1 lbs 3 oz
Flow Rate (Liters per Minute) 1 L/Minute 1 L/Minute 2.5 L/Minute 1 L/Minute 1.75 L/Minute 0.5 L/Minute
Cartridge Life (Liters) 2,000 Liters 2,000 Liters 10,000 Liters 2,000 Liters 1,500 Liters 3,000+ Liters
Effective Against Protozoa (ex: Giardia, Cryptosporidium)
Effective Against Bacteria (ex: E. coli, Salmonella, Cholera)
Effective Against Viruses (ex: Hepatitis A, Norwalk, Rotavirus)
Effective Against Particulates (dirt, microplastics)
Effective Against Taste/Odor
Testing Standards P248/P231 NSF P231 Testing For removal of bacteria (99.9999%) and protozoa (99.9%) from beginning to end of filter life in “worst-case” water. NSF P231 Testing For removal of bacteria (99.9999%) and protozoa (99.9%) from beginning to end of filter life in “worst-case” water. NSF P248 Testing Standard used by U.S. military for removal of viruses, bacteria (99.9999%), protozoa (99.9%), and sediment from “worst-case” water conditions. NSF P231 Testing For removal of bacteria (99.9999%) and protozoa (99.9%) from beginning to end of filter life in “worst-case” water. NSF P231 Testing For removal of bacteria (99.9999%) and protozoa (99.9%) from beginning to end of filter life in “worst-case” water. NSF P248 Testing Standard used by U.S. military for removal of viruses, bacteria (99.9999%), protozoa (99.9%), and sediment from “worst-case” water conditions.
Water Bottle Adaptor

Product Description

Product Description

The MSR MiniWorks EX Microfilter Water Filter provides proven, reliable water filtration for camping and hiking, backcountry adventures, global travel, survival situations, and emergencies. The replaceable Marathon EX ceramic element removes bacteria (such as E. coli. Shigella, salmonella, cholera), protozoa (such as giardia, cryptosporidium, amoebae), and particulate, and its carbon core eliminates unpleasant tastes and odors caused by organic compounds such as iodine, chlorine, and pesticides. Thanks to its innovative AirSpring Accumulator, the microfilter is capable of pumping one liter of water per minute, a flow rate that is easily maintained in the field, without any tools. The MSR MiniWorks EX Microfilter meets NSF protocol P231 for removal of bacteria (99.9999%) and protozoa (99.9%), throughout its replaceable filter life of 2,000 liters of water. Compatible with a wide variety of water containers such as Nalgene, Camelback, and MSR Dromedary Bags (sold separately); bottom screws on to threaded lids, or water can be pumped directly into a hydration reservoir drinking tube. Lightweight and compact, the pump measures 7.5 x 2.75 inches and weighs one pound. A storage bag is included. Manufacturer’s limited lifetime warranty. Made in the USA.

Amazon.com

MSR MiniWorks EX Microfilter

The MiniWorks EX microfilter from MSR is built to deliver long-lasting, field-maintainable water filtration in demanding environments. Engineered for frequent and heavy use, it utilizes MSR's 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 with no tools required. It’s lightweight and compact and, most importantly, has been proven reliable by thousands of adventurers world wide.

Key Features:
  • 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.
Specifications:
  • Field cleanable and maintainable
  • Effective against: protozoa, bacteria, chemicals/toxins, and particulate
  • Not effective against viruses
  • Weight: 1 pound / 456 grams
  • Dimensions: 2.75 by 7.5 inches / 7 by 19 centimeters (WxL)
  • Filter media: Ceramic Plus Carbon
  • Filter pore size: 0.2 microns
  • Flow rate: 1 liter per minute
  • Flow (strokes per liter): 85
  • Cartridge life: ~2000 liters
  • Cartridge replacement indicator
  • Mechanical advantage
  • Water bottle adapter included
  • Made in Seattle, USA
  • Limited lifetime warranty

Product information

Technical Details

Additional Information

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MSR

MSR MiniWorks EX Backountry Water Filter


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Customer reviews

4.6 out of 5 stars
4.6 out of 5
1,527 global ratings

Customers say

Customers like the quality, ease of cleaning, and filter quality of the water purification unit. For example, they mention it's a high quality product, it cleans easily, and does a superior job of filtering. Most appreciate the size, saying it'll fit into a day pack with ease. That said, some disagree on flow rate, and weight.

AI-generated from the text of customer reviews

228 customers mention193 positive35 negative

Customers like the quality of the water purification unit. They say it's a high-quality product, perfectly functional, and solid. The pump works great and the handle feels sturdy. Overall, customers are satisfied with the product's quality and performance.

"...Pretty much neutral. More importantly, it tasted CLEAN and nobody got sick...." Read more

"...No medical issues what so ever.Invaluable product for a bug out bag or for any prepper to have in his/her closet...." Read more

"This worked great and used it for my first back country hunt this year. This is also my first experience using a filtration system...." Read more

"Perfectly functional.Pros:-lightweight-field "maintainable" (though maybe not "repairable")..." Read more

97 customers mention79 positive18 negative

Customers find the water purification unit easy to clean. They mention that the instructions on how to break it down are clear. They also say that the filter is easy to care for and clean, and that it removes 99% of bacteria. Customers also say the unit works really fast again when cleaned.

"...You can literally have this thing stripped down and cleaned completely in about 5 minutes, and that includes the sterilization of the filter element...." Read more

"...2. It has a 0.45µ filter, which removes 99% of bacteria, and probably 99.999% of parasites (like giardia)...." Read more

"...Water came out clean and odor free. First couple liters had that new filter taste, but aside from that, taste was of clean tap water...." Read more

"...Breaking it down to clean was easy and instruction on how to break it down were clear...." Read more

85 customers mention82 positive3 negative

Customers are satisfied with the quality of the water purification unit. They mention it's built sturdily, does a superior job of filtering, and is amazing. Some say that it effectively filters water and is reliable. Overall, customers are happy with their purchase and recommend it to others.

"---Update after 3 years of use; This filter is still going strong. Have used many times, pumping several liters at a time...." Read more

"The great thing about this filter is I was able to filter liters of water for all my friends who didn’t have water filters...." Read more

"This filter is amazing. It is the gold standard of water filtration in my book...." Read more

"Yes, it is an excellent water filter. Is it easy to use in the field? Not at all...." Read more

84 customers mention59 positive25 negative

Customers like the durability of the water purification unit. They mention that it's reliable, tough, and sturdy. The filter seems solid, and it'll last you years. Customers also appreciate the quality construction and the fact that you can get replacement parts.

"...6. Despite being all plastic, this thing is bombproof...." Read more

"...simple operation with very high quality construction, this pump will last a long time...." Read more

"...An excellent feature of this is the robustness of the assembled unit. (However, the internal ceramic filter has to be handled carefully)...." Read more

"...The word is, these ceramic elements are fragile. Finding this out at the wrong time and being caught without a spare would be a very bad thing...." Read more

81 customers mention72 positive9 negative

Customers like the size of the water purification unit. They say it is very compact, easy to use, and portable. Customers also mention that the device is not too bulky, and is a great option for ensuring you have safe water. They also say that it is easy to store and that it can fit on to water bottles to pump.

"...It comes in a nice little mesh bag, so you can stuff it into a corner of your pack...." Read more

"...Pump came in very impressive packaging, mesh bag to carry everything in, and thorough instruction manuals, one for each language..." Read more

"...-flow rate is decent-hose wraps around body and secures in handle for easy packingCons..." Read more

"...And when you are out camping, the included carry bag has a mesh side, so any spilled water or water still in the hose can dry out between uses...." Read more

80 customers mention68 positive12 negative

Customers find the water purification unit very simple to use. They say the included directions are easy to understand and the overall weight of the filter wasn't bad. Customers also mention that the pump is easy to operate, the design is simple to understand, and the assembly is simple. They appreciate the ease of maintenance, break down, and cleaning the filter in the field.

"...The filter is very simple to use and has a good output-per-pump ratio...." Read more

"...I have several 3L canteens that I can fill in 2-3 minutes. It makes it easy, reduces spillage, and just is cool.4...." Read more

"...impressive packaging, mesh bag to carry everything in, and thorough instruction manuals, one for each language (a fair number of them), not this go..." Read more

"...The pump was easy to operate. The hose was long enough for me to sit on a log without being bent over to keep the hose in the water...." Read more

96 customers mention42 positive54 negative

Customers are mixed about the flow rate of the water purification unit. Some mention that it pumps water plenty fast when the filter is clean, while others say that it slows down after using for a while.

"...Boiling water takes too much time, and if you need to stock up on several liters in a dry area, you may not be able to boil enough...." Read more

"...The filter is very simple to use and has a good output-per-pump ratio...." Read more

"...more difficult (it has a lot more to filter) and thus flow rate was slightly reduced. Water came out clean and odor free...." Read more

"...-flow rate is decent-hose wraps around body and secures in handle for easy packingCons..." Read more

61 customers mention41 positive20 negative

Customers are mixed about the weight of the water purification unit. Some mention it packs small and fairly light for the type of filter, while others say it's heavier than they would like.

"...1. It is lightweight (I used to have a Katadyn, which is built and weighs like a rock), so it's not going to add too much to your pack...." Read more

"Perfectly functional.Pros:-lightweight-field "maintainable" (though maybe not "repairable")..." Read more

"...It isn't the lightest filter, and it is definitely a workout if you are filling 4 Nalgene bottles, but it is bombproof and has never failed me...." Read more

"Small, light weight, easy to use, packs well. Highly recommend." Read more

Good for emergencies and camping
5 Stars
Good for emergencies and camping
I bought it to complement my backpacking gear. In the past I carry the water in my weekend adventures but, as I am growing older the weight factor is becoming a priority. I conducted an test simulating the water conditions you may found in the Southern states (Florida is my home) following the manufacturer’s recommendation to reduce sediment getting into the filtration system. Pumping the water into the system was no difficult when using a coffee paper filter covering the intake part. The first filtration left a colored water without particles that was a little smelly. I filtered that water and the second process produced a more clear result without the smelly. When I drink from the second glass the water did not have any particular flavor and was ready for consumption. My conclusions are that the system fulfilled the purpose but, I will use a second filtration/purification, such tablets or a sawyer personal use small purification system for my peace of mind.
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Reviewed in the United States on November 9, 2009
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MarcE
4.0 out of 5 stars Useful
Reviewed in Sweden on August 28, 2021
kouji
5.0 out of 5 stars 非常用。まだ使っていませんが、安心感あり。
Reviewed in Japan on March 24, 2024
5.0 out of 5 stars A+
Reviewed in Australia on October 5, 2020
Cliente Amazon
4.0 out of 5 stars Ideal para viajes a destinos "insalubres"
Reviewed in Spain on April 3, 2017
3 people found this helpful
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Amazon Kunde
5.0 out of 5 stars Erfüllt absolut seinen Zweck
Reviewed in Germany on July 1, 2016
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