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. The filter is very simple to use and has a good output-per-pump ratio. I took this as a sign that this is the filter to have and ordered it from Amazon, and it has been worth every penny. I figured I could just go pick one up at the local Cabela’s or REI, but BOTH retail stores were sold out of these, while there was still a good supply of the other MSR and Katadyn filter systems on the shelf. I researched filtration systems for almost a month before settling on the MSR miniworks. Manufacturerâs limited lifetime warranty. Lightweight and compact, the pump measures 7.5 x 2.75 inches and weighs one pound. 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.
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. 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. 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. The replaceable Marathon EX ceramic element removes bacteria (such as E. I still have a niggling doubt that I should have gone with Katadyn.The MSR MiniWorks EX Microfilter Water Filter provides proven, reliable water filtration for camping and hiking, backcountry adventures, global travel, survival situations, and emergencies. Both the Siltstopper and packs of replacement Siltstopper filters available from MEC. I bought one after my inaugural trip with the Miniworks, but haven't had a chance to field test it yet. You can reattach the Siltstopper (in reverse) to the clean side of the filter (output) to back flush the unit.
This will reduce the need to clean the main filter. Fit this onto the hose just upstream of the intake pod and it's supposed filter out particles down to 5 microns. One way to prevent filter blocking is to buy the small MSR Siltstopper prefilter for $15 or so.
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See owner's manual to see how to repair these faults. Then you may have a sticky piston or a stuck valve. Most users report that cleaning the filter makes pumping easier and faster, but you report that pumping is still inefficient after cleaning. And check out the numerous and helpful user comments on MEC's product page on the Miniworks. This is a well-tested (used by Marines in Iraq, I'm told) and well-reviewed filter, but many users report difficulties pumping after even a short period of time. I had the same problem with slow and arduous pumping. "Airspring design provides best performance when air is visible in Housing. Contrary to what some posters claim, the MSR Miniworks User's Manual insists that pumping air is normal.
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