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Rated 5 out of 5 by from Awesome little pump This little pump works amazingly well. I have owned it for 5+ years now, and have never needed to replace anything on it. I do meticulously maintain it per the owner's manual after each trip, which to be honest is kind of a pain, but is well worth the effort. My pump has been used for many liters of water, and have never had any issues with it. However, it is slow, much slower compared to my buddy's Katadyn. It is slow, and kind of awkward and difficult to pump, but does an amazing job filter the water which is what's really important. Be careful cleaning it in the field. It has little o-rings and pieces, and they can get easily lost leaving the pump useless.
Date published: 2017-02-08
Rated 5 out of 5 by from Earned my trust I used the MSR MiniWorks EX Filter on a backpacking trip in the Olympic National Park. It is pretty light and easy to set up and use. The river was not as clear as I would have liked it to be but the filter did not clog up and worked as promised. Clean-up was easy and could be done in the field if needed. The instruction booklet was easy to read and very detailed. It screws on to any wide mouth water bottle for easy operation. To be honest I was paranoid about getting sick because this is the first water filtration system I'd ever used but to my pleasant surprise it did not let me or my wife down.
Date published: 2010-07-18
Rated 5 out of 5 by from It's because it's ceramic,,,,,, This is for all of you who don't really "get" water filters. The reason this filter gets clogged and needs cleaning sooner than others is because it's CERAMIC and the porosity is much tighter than most, which means it's doing a WAY better job at filtering things out than most other filters, including those "easier" paper or fiber filters. In the long run, it will last a LOT longer also. Also, there is a lot of water sources that appear to be "clear" or clean sources that have plenty of organic debris in it which is not very obvious, and rest assured, this filter is doing a way better job of filtering it out. I use gravity feed fiber filters also, it depends on the situation. Gotta go - P
Date published: 2016-06-25
Rated 5 out of 5 by from Superb filter! Have owned this filter for 9 years and use it in the field anywhere from 10-30 days every year. I have used it in conditions from the cleanest spring seeps to silty trenched driplines at the base of timberline snowbanks in the afternoons(looks like chocolate milk). It has NEVER failed to provide wonderfully purified water. I have had geardia before from purification systems that were not up to the task, but never an issue with this pump. It is a water filter so when it becomes more difficult to pump, you take it apart and clean it. The worse the quality of the water you are filtering, the more frequently it needs cleaned. I have had to replace the element, but that was because I dropped it on a rock. These elements will last a long time, and if you take proper care of this filter it will take care of you.
Date published: 2013-03-31
Rated 5 out of 5 by from Great filtration system I very much like the MSR MiniWorks EX. I have used it from backpacking to Military field operations. It has never let me down. It does have some cons but are from diffrent water sources. In clear water, the filter pumps easily but i have used some nasty muddy water which will clog your filter much faster, but what would you expect, clean it and drive on. No matter how muddy, dirty, grimmy or nasty the water i am filtering from, the MSR MiniWorks EX has done its job, with no after taste and clear tasty water.
Date published: 2013-02-17
Rated 1 out of 5 by from Very Disappointing I bought this pump for a trip into the BWCAW(Boundary Waters). I couldn't believe how frequently I had to clean it. I could only get 3 liters of water before the ceramic element needed to be scrubbed down. The first liter went really fast, the second was slower but still decent for the most part, the third liter was a struggle to get. This was consistent on all lakes. The lakes were visibly clear and I was not near any swamps. The water that was pumped was great though. No odor or taste whatsoever. I see others have complained about the force needed to pump it but I didn't think it was bad. The maintenance is just too high to recommend this product though.
Date published: 2010-10-08
Rated 4 out of 5 by from Just what I expected Bought this pump for our Mt. Whitney trip. Chose this one because I read that the Marine Corps had chosen it for our Marines as part of their gear. We used it over 3 days up at Trail Camp and at several other spots along the Whitney Trail. Several times we had to fill four 100 oz. Camelbak reservoirs along with our 32 oz. bottles. That took a lot of pumping. I thought that the pump would be a little more efficient. The pump slowed down after about 300 ounces, so I removed the filter element, scrubbed it with the green scrubbie, and it worked as well as it had before. The water we were pumping was really clear though, so I was a little disappointed that I needed to scrub the element so soon. The pump action and the hoses all worked fine. I am not a water snob, I do most of my water drinking from the tap, but the water that we filtered tasted really good.
Date published: 2012-08-12
Rated 1 out of 5 by from Only if you like Cleaning Filters I bought this after reading all the good reviews and took it on a week long Kings Canyon backpacking trip with some friends. It worked great the first couple times but then I noticed the filter would quickly become clogged. I thought that was normal until I noticed that my friends water filter (of a different brand) never needed to be cleaned and he was done filling his bottle in 1 minute when it took me about 5! I thought his was broken but his water tasted just as good. Needless to say mine went to the bottom of the pack after the continuous cleaning got old and never saw the light of day again. If you like cleaning filters this is a great water filter.
Date published: 2009-03-02
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Questions & Answers

I have a new miniworks ex micro filter. I have read about placing the coffee filter on the inlet tube end. Upon viewing the sweetwater I see it has a screened inlet. Can i purchase that part and attach it to my filter?

Asked by: HuntBchSoCal
The screened prefilter for the MSR SweetWater can be purchased from MSR directly, but it is not compatible with the MiniWorks EX Water Filter.
Answered by: REIservice
Date published: 2016-07-26

I have had a MiniWorks EX in storage for many years...never been used (part of an Earthquake preparedness kit). Now I want to take it on a backpacking trip. Is the cartridge still ok to use?  Asked another way, what is the shelf life of the cartridge?

Asked by: gregfree
The MiniWorks EX Water Filter will be just fine to use after years of storage. MSR recommends sterilizing the ceramic element after long periods of storage. Instructions for sterilization can be found on MSR's website. MSR does not list a shelf life for the ceramic element.
Answered by: REIservice
Date published: 2017-05-30

The inlet hose barb has broken on my unit. I can't find where to buy a replacement part for it. The MSR website doesn't list anything to buy.

Asked by: clemson61
I had an issue with mine that I needed a new duckbill and spring. I had lost mine in the field. I contacted MSR directly and they were great. They had a replacement shipped the following day. Get a hold of them. I believe they are called Cascade Designs 800-531-9531. Good luck
Answered by: gambillford
Date published: 2017-10-15

Is the a MSR Bladder that works in conjunction with the Mini works pump?

Asked by: Timmy
The 4 liter MSR Dromedary Bag directly attaches to the MSR MiniWorks.
Answered by: REIservice
Date published: 2018-01-05

just ordered on of these. Not to excited about the reviews. Question: Does this unit come with a pre-filter

Asked by: Frodo
The piece of open-cell foam that is inserted through the intake hose prevents particulates from getting inside of the hose and clogging the filter.
Answered by: REIservice
Date published: 2017-09-14

does this filter eliminate most lead, pesticides, arsenic, mercury?

Asked by: mk hiker
​This filter will remove most pesticides, but is not designed to filter out contaminates like heavy metals or high chemical concentrations.
Answered by: REIservice
Date published: 2018-02-11

Can this filter be used with an outlet hose (hose for clean water)? I know it screws onto Nalgenes but I was wondering if I could use it more like a traditional 2 hose pump system. Thanks!

Asked by: Steak
An output hose can be attached to the MiniWorks EX Water Filter. The output hose is not included with the filter.
Answered by: REIservice
Date published: 2016-07-06

Do adaptive devices need to be purchased with this product? It is not clear to me exactly how it works. I am thinking that I need an adapter for a Nalgene. Help? Thanks!

Asked by: Shneed
No adaptive devices need to be purchased. Simply drop the intake hose into the water source, screw the pump onto the opening of your Nalgene bottle or backpack bladder and pump. This is very convenient to have it connect like that when you are balancing on a rock trying to make sure you don't fall in the water!
Answered by: REIservice
Date published: 2016-04-27
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