Brand | MSR |
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Special Feature | Lightweight |
Product Dimensions | 10"L x 4"W x 7"H |
Package Information | Bag,Cartridge |
Installation Type | Portable |
Power Source | Hand-powered |
Item Weight | 0.45 Kilograms |
Model Name | MiniWorks EX Filter |
Maximum Flow Rate | 1 Liters Per Minute |
Item Package Dimensions L x W x H | 11.81 x 7.91 x 5.31 inches |
Package Weight | 0.71 Kilograms |
Item Dimensions LxWxH | 10 x 4 x 7 inches |
Brand Name | MSR |
Color | Grey/Red |
Suggested Users | unisex |
Number of Items | 1 |
Manufacturer | MSR |
Part Number | 56425 |
Model Year | 2015 |
Style | Water Filter |
Size | One Size |
Sport Type | Camping & Hiking |
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86% positive over last 12 months
98% positive over last 12 months
86% positive over last 12 months
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MSR MiniWorks EX Backountry Water Filter
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Free returns are available for the shipping address you chose. You can return the item for any reason in new and unused condition: no shipping charges
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- Select the return method
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Purchase options and add-ons
Brand | MSR |
Special Feature | Lightweight |
Product Dimensions | 10"L x 4"W x 7"H |
Package Information | Bag,Cartridge |
Installation Type | Portable |
Power Source | Hand-powered |
Item Weight | 0.45 Kilograms |
Model Name | MiniWorks EX Filter |
Maximum Flow Rate | 1 Liters Per Minute |
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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
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In 1969, Seattle engineer and lifelong mountaineer Larry Penberthy formed Mountain Safety Research as a one-man crusade dedicated to improving the safety of climbing equipment. The fuel behind Larry's passionate fire was a simple belief that still drives our team today:
The idea that better, safer, more reliable equipment is the key to unlocking greater adventures.
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Designing for Durability and Longevity
We build products to last, offering outdoor enthusiasts more adventures and reducing the amount of goods piling up in landfills.
Our first priority is to design and manufacture durable, long-lasting products. Extensive testing—both in-house and in the field—allows us to ensure that our products will stand up to the wear and tear to which our customers subject their gear.
Our products have stood the test of time, and we often hear stories from customers who are still using MSR stoves from the 1980s. We believe in what we make and stand behind it.
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From the manufacturer
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
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ReliableDurable carbon/ceramic element ensures safe, taste-free water—even with frequent, heavy use. |
TestingMeets 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 FlowAirSpring Accumulator increases filtration speed; up to 1-liter per minute. |
Better-tasting WaterCarbon core removes unpleasant tastes and odors caused by organic compounds, such as iodine, chlorine, and pesticides. |
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.
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 EX Microfilter | MiniWorks EX Purifier | Guardian Purifier | TrailShot Microfilter | AutoFlow XL Gravity Filter | Guardian Gravity Purifier | |
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Customer Reviews |
4.6 out of 5 stars
1,527
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4.6 out of 5 stars
211
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4.6 out of 5 stars
442
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4.6 out of 5 stars
945
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4.7 out of 5 stars
55
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4.5 out of 5 stars
71
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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
ASIN | B000BBF2RY |
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Customer Reviews |
4.6 out of 5 stars |
Best Sellers Rank | #36,512 in Sports & Outdoors (See Top 100 in Sports & Outdoors) #65 in Camping & Hiking Water Filters |
Date First Available | July 28, 2003 |
Feedback
Product guides and documents
Videos
Videos for this product
2:48
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Off-grid Approved: Practice Patient while Pumping
MellyMel
Videos for this product
5:07
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MSR MiniWorks Maintenence
Cascade Designs Inc.
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Customer reviews
Customer Reviews, including Product Star Ratings help customers to learn more about the product and decide whether it is the right product for them.
To calculate the overall star rating and percentage breakdown by star, we don’t use a simple average. Instead, our system considers things like how recent a review is and if the reviewer bought the item on Amazon. It also analyzed reviews to verify trustworthiness.
Learn more how customers reviews work on AmazonCustomers 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
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
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
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
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
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
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
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
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
Reviews with images
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Top reviews
Top reviews from the United States
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In Camp:
The filter is very simple to use and has a good output-per-pump ratio. You never really feel like you are doing more work than you should for the amount of water you are pushing through, especially if you take into account the fact that every pump is worth about one gulp of nasty water that you WON'T have to drink. If you do see a diminished output, simply unscrew the filter housing and give the element a light scrubbing. We were taking water from a brown lake that is loaded with tannins and we would get about 2 litres through (about 2 full-size nalgene bottles worth) before we noticed the filter could use a cleaning. Tannin-loaded water is supposedly some of the worst for clogging these ceramic filters, so if you have cleaner water sources at your site than we do, your element-cleaning cycles should be farther apart. The water came out crystal-clear and almost tasteless. It didn't taste like Dasani bottled water, but it definitely didn't taste like tea-colored lake water either. Pretty much neutral. More importantly, it tasted CLEAN and nobody got sick. Also, the MSR Miniworks requires no chemical additives but still claims to filter everything but viruses. The chance of contracting a waterborne virus from a U.S. lake or stream (think Polio, Hep-A, SARS, and a few others which you have probably had vaccinations for) is far lower than getting sick from bacteria or parasites. If this still bothers you, you can still boil your clear, clean-tasting water just to be sure.
Out of Camp:
The maintenance on this filter is very simple. The unit breaks down into 4 major parts, and the wrist pins on the pump assembly are quick-release squeeze-and-push types. You can literally have this thing stripped down and cleaned completely in about 5 minutes, and that includes the sterilization of the filter element. A couple dabs of silicone grease or chap stick is all you need to lube it up when you are reassembling the unit.
The Hidden Bonus:
$80 may seem like a lot for a water filter, but the MSR miniworks pays you back exponentially...
Prior to buying a filtration system, everyone in our backpacking party hauled their own water needed for the entire trip. We would calculate what we needed for hydration and cooking each day, plus a bit more just in case, and we strictly stuck to these rations. We would have enough water, but never enough to truly quench one's thirst. Having this filter in our party allowed us to drop about 15 lbs carried, per person! Plus, we didn't have to pack out a bunch of empty water bottles anymore. One filter supports 4 of us and we now drink as much as we want. When you think about how important hydration is to your body's systems (Read Cody Lundin's "98.6 Degrees" book and you will know more about the subject than you ever wanted to), shelling out $80 to have clean, safe water on-demand anywhere you can find a water source is a small price to pay.
Tips:
-Put a coffee filter over the hose inlet and secure it with a twist-tie, rubber band, or fishing line. This will make your MSR filter pump more efficiently for longer without as-frequent element cleaning. Everytime you clean the element, you are scrubbing away some of the element's overall diameter. When it gets too thin, you have to get a new element. Fewer cleaning cycles = prolonged filter life and more money remains in your pocket. Filter element, $40. Coffee filter, 3 to 4 cents.
-Bring a spare filter element if you are going on an extended trip or are going to be absolutely dependent on this filter for your drinking water while you are out! Meaning: hiking back to your vehicle and driving like a madman to the nearest 7-11 for a drink before you go into a coma from dehydration is not going to be an option! 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. If you spent the cash for the filter and other people in your party use it, have them pony up the $40 and buy the spare element for you. It's only fair.... right?
-USE A NALGENE BOTTLE WITH THIS UNIT (or other similar one that will attach to the adapter). The motion created while you are pumping is far too violent for precision-aiming the output stream into any loose container, except for a bucket. You can also attach another length of rubber hose to the outlet and run that to your container, but we have not tried this yet. The Nalgene bottle seemed like the simple solution to use with the filter and we filled our other containters from this bottle.
{Product use update} - Our party of 3 did a 4-day backcountry hike in the Grand Canyon (search: Tanner Trail) this past winter. This is definitely NOT a tourist trail, and the first 2000-3000 ft of elevation is not much a trail at all. The noted only water source along this entire route is at the very bottom of the canyon, the Colorado River. We were able to augment our hike-in water supply by searching for pools of water trapped in depressions of the rocks near the places where we made camp, and pumping water from them using the MSR Miniworks. I don't even want to think of what was in those water pools, but what came through the filter was clean and refreshing. We made notes of the larger water pools, which allowed us to lighten our water load on the hike-out and stop by the pools for a top-off when we needed it.
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. It's heavier than chemicals or some of the UV systems, but it's not bad. It comes in a nice little mesh bag, so you can stuff it into a corner of your pack.
2. It has a 0.45µ filter, which removes 99% of bacteria, and probably 99.999% of parasites (like giardia). It does NOT remove viruses, but unless you're in a crowded city without a good sewage system, I probably wouldn't worry about it. MSR makes a filtration system that adds chlorine, but for a North American or European trip, not worth it.
3. The bottom of the device fits onto standard wide mouth Nalgene bottles and canteens. I have several 3L canteens that I can fill in 2-3 minutes. It makes it easy, reduces spillage, and just is cool.
4. The tube end that goes into the water source has a float. This keeps the intake off the bottom which has fine silt and crud. That'll clog up your filter in minutes if not seconds.
5. The ceramic filter can be easily cleaned. I sometimes carry a spare filter, but I've never replaced the original despite filtering literally thousands of liters of water. Keep it clean, and don't try to filter muddy water, and a ceramic filter can last nearly forever.
6. Despite being all plastic, this thing is bombproof. I don't throw it in the bottom of my pack to be crushed, putting it in a side pocket, but I'm not sure I worry about it that much.
7. It pumps fast, as long as you keep the crud out. I get 1-1.5 l/min. Pristine Sierra streams give me the upper end.
8. Because this filter removes most of the organics in the water, the taste is wonderful. This is what I don't get about the people who love the chemicals. You get the nasty iodine or chlorine tastes PLUS the awful taste of some of the water. I actually use this filter at home sometimes to refill water bottles and put them in my refrigerator.
There's more, but I'm supposed to keep this short. Are there negatives? I don't see one, but I'm sure someone will complain about the weight or plastic breaking or something. None of that has happened to me.
This is probably the best water filter I've ever purchased.
Looking for a filter/pump combo? Decent price? Right here. Pump can be completely disassembled, every last little part, with no tools what so ever. Pump is very simple operation with very high quality construction, this pump will last a long time. Pump came in very impressive packaging, mesh bag to carry everything in, and thorough instruction manuals, one for each language (a fair number of them), not this go to page 5 for english crap. Pump out put is a large mouth thread that I am unfamiliar with, though it appears to be a standard camel-bak threading at first glance. MSR makes a bag that will screw in. Eventhough output is threaded, you do NOT need to use that, there is an output nipple you can cut a length of hose (same dia hose the pump comes with) and use that. We used a few inch section just long enough to make it easier to fill bottles and other items.
Unlike some others people, we actually tested this in a very questionable, dirty, dark water pond, not some fancy clear stream. That being said, pump operation was slightly more difficult (it has a lot more to filter) and thus flow rate was slightly reduced. 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. My self and several others drank at least one liter and I have drank over a gallon I took home in my water carrier. No medical issues what so ever.
Invaluable product for a bug out bag or for any prepper to have in his/her closet. I would buy over and over again.
Top reviews from other countries
On rain water it worked great and fast.
Fuimos a la Selva en Centroamerica, el agua era literalmente marron y usamos este filtro para cocinar incluso en alguna ocasion para beber.
Creo que para viajes "extremos" es una buena inversion en tu salud.
Es muy ligero, No pesa mucho. Asi que en montañismo quizá es mejor que llevar agua embotellada si sabes que vas a encontrar rios.
La bomba es delicada hay que usarlo con cuidado.
Aun no he tenido tiempo de usar el que he comprado pero es el mismo modelo que usé por lo que me atrevo a opinar.
Es gab absolut keine gesundheitlichen Probleme, was auf die Qualität des Filters zurückzuführen ist. Um eine 3 Liter Wasserblase zu füllen ist eine gewisse Kraftaufwendung erforderlich (ca. 250-300 Pumpbewegungen), aber trotzdem tolles Produkt und ich würde es immer wieder kaufen!!