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Customers most agreed on the following attributes:
Even though I personally haven't bought this product or owned it I am a Boy Scout and one of the kids on a 50 mile hike let some of the kids in my troop use it. Within two days the thing worked horribly. They didn't follow the 8 liters to clean it, it was very hard to use.
I tried to use this filter for a through paddle of the Northern Forest Canoe Trail. I purchased one and tried to backflush the filter. It wouldn't work after that. So I bought another one. Same problem! Thought maybe the first one was my fault somehow. Just not a good product! I stick with my miniworks ex even though it is not at all light it survived a through hike of the Appalachian Trail.
from New york, NY on 8/3/2008
I have another water filter from MSR, which has always been slow, now unbearably slow, no matter how much I clean. I haven't even used it many times. Considering the slowness and the weight of the old one, I decided to buy another. This time I did my homework and researched it. I even tried a few other models and brands from my friends and asked them about the taste of filtered water. In the end I decided on this one for. After I bought it I tested at home. it is so far so good. Light, small and fast. I can't tell much about the taste of water at this stage and the filtering rate after it gets dirty a bit. I will do that after I tasted and tested it in the field.
I have used this filter on 2 backpacking trips. It has to be cleaned so often its not even usefull any more. After a total of 12 days backcountry use, 4-8 liters/day, cleaning it every day, the filter hardly works any more. I am very disapointed in this filter. Get a Miniworks filter instead. If you carry this filter then be sure to have a backup method of purifing or you will end up boiling your water.
Please call us in customer service @ 888.463.6367, check out our website www.ems.com, or visit one of our EMS Retail locations if we can assist you in any way.
from Gilford, NH on 7/30/2008
I haven't used it too much but everything seems really simple to maintain and it does a great job. It's really lightweight so you won't mind throwing it in the pack.
from Camden, ME on 7/28/2008
As I planned a five-day hike of the 100 Mile Wilderness last week, I realized that a great way to reduce my pack weight would be to carry no more than a liter at a time and to drink 3/4 liter each time I filtered water. However, I had found that assembling and pumping a liter of water with the Katadyn Hiker typically took about ten minutes, time I did not want to spend 3-4 x daily. Consequently, the MSR Hyperflow held great promise given that it is carried fully assembled AND that it purportedly pumps as fast as a big squirt gun. Unfortunately, after the first two days, pumping the Hyperflow became excruciatingly difficult, despite my conscientious backflush cleaning of the filter daily. I assembled and reassembled numerous times, expelling all trapped air, and still no better. These efforts plus the constant concern that a dropped pack might fracture the filter without any obvious sign of fracture made the whole process quite annoying. In the field, doing the backflushing every 8 liters, and checking for a broken filter by the bubble test is really quite problematic. Finally, the claimed weight of 7.5 ounces is inaccurate. The assembled unit with its little carry case weighs 10 ounces, only 2.5 ounces less than the much more reliable Katadyn Hiker.
Please call us in customer service @ 888.463.6367, check out our website www.ems.com, or visit one of our EMS Retail locations if we can assist you in any way. This filter did win the Backpacker Editor's Choice Award this year (2008)...and they had this to say about it..."If you think water filters are slow, heavy, and prone to clogging, we have a message: You're wrong. The HyperFlow is so fast and light it converted several editors who had sworn off filters in favor of chemical treatment. The secret is in the filter cartridge. It's the size of a fat Sharpie marker, and it houses a bundle of hollow, porous tubes; water is forced through the open end of the tubes and then filtered through tiny pores. And it does this at the astounding rate of 3 liters per minute. "The biggest bummer with water filters has always been the time they require, which is only compounded as your group size grows," remarked one tester. "No more. This baby cranks!" The whole system, which includes a wire-mesh pre-filter, packs down to the size of a small bike pump and weighs less than a cup of water. The HyperFlow filters nasties as small as .2 microns, which removes protozoa (like giardia and cryptosporidium) and bacteria (like E. coli), but not viruses. MSR claims a filter cartridge lifespan of 1,000 liters, and during six months of field-testing we didn't experience a single slow-down."
from Orange County, CA on 6/1/2008
Lightweight so its perfect for backpacking. Filters water incredibly fast with minimal effort.
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from NY, NY on 5/29/2008
I used to use the miniworks and wanted to lighten my load. This filter is amazing- its so light, easy to use, great taste of water, and easy to pump (seriously takes 1 minute to fill the nalgene). Beware of trail maintanence as you must flip the filters and reverse pump every 8 liters.
from Boston on 5/29/2008
Haven't had a chance to thoroughly test, but seems great thus far.