MSR Hyperflow Microfilter

Adapter:	Nalgene, MSR hydration products, wide-mouth with 63mm threaded opening
Cartridge Life:	Up to 1,000 liters, depending on water conditions
Cleanable Filter:	Yes
Country of Origin:	China
Dimensions:	7 x 3.5 in. or 17.8 x 8.3 cm
Field cleanable:	Yes
Filter Element Duration:	265 gallons
Filter Element Type:	Hollow Fiber
Filter Type:	Hollow fiber technology
Filter medium:	Hollow fibers
Flow Rate:	Pumps more than 3 liters per minute or one liter every 20 strokes
Gravity Flow:	No
Housing material:	ABS plastic
Kills Viruses:	No
Length:	7 in/17.8 cm
Micron Size:	0.2 microns
Output:	2.75 liters per minute
Pump Rate:	3 qt. / min.
Pump force:	Unavailable
Pump strokes per liter:	30 - 40
Recommended Use:	Backpacking, camping
Removes:	Protozoa and bacteria
Warranty:	Limited Lifetime Lifetime
Weight:	7.4 oz. or 209 g

Size
Red	99.00 99.90 11 More...

Works for about a day
Rating:
I just got done hiking the Appalachian Trail, and carried the Hyperflow from Troutdale, Virginia to Maine. (about 1700 miles) I hated every minute I had to use this awful pump. I was replacing an older MSR miniworks, which was twice the weight and moved a very low volume of water. Because of the way I had my water system set up with a camelbak inside my pack that is very difficult to remove on a regular basis, I needed some sort of pump to pump water in through the drink tube.The technology behind this filter is flawed. Simply stated, backflushing does almost nothing to clear this filter once it gets clogged. So you basically have a very effective, as-advertised 3LPM pump that is even exciting to use, until it clogs for the first time. That first time for me was about 8 Liters. After that, it was the biggest pain in the butt to use this thing. The pumping became so hard that I would need to brace one arm against my knee to get the needed leverage. It was like a daily workout, and I dredded pumping water so much that I ended up skipping water sources and at times running out of water all together.No amount of "backflushing" would restore this thing to its advertised functionality. In fact, once the filter gets too clogged, the backflushing method does not work at all because you are basically relying on a vacuum to pull the water through the filter during a backflush, and that simply is not enough psi to do the job. (the same pressure that I needed to brace one arm against my knee to pump water through is required to pull water back out during a backflush via a vacuum). So, in the end the thing just gets worse and worse. I finally called MSR, and the freely offered to send out a new cartridge. This to me is evidence that they freely admit the problem. My new cartridge? Lasted for 5 Liters, and immediately was worse than my old one ever was.I knew dozens of hikers on the AT who had bought this thing, and NO ONE was still carrying it by the end. In other words, I was the only sucker. One hiker I knew who was carrying this piece of junk basically had MSR send a new cartridge to every town along the trail, before finally demanding a replacement Miniworks. Each [$]cartridge will last you a day tops before it needs replacing.I guess the upside to all of this is that you have yourself a great filter as long as you have the luxury of receiving a package from MSR every few days. If you do not have that luxury, then stay away from this product, which I believe is probably the worst filter ever made.
jdavidse at REI on 11/21/2008
Professional Outdoor Guide- bad product
Rating:
I've been an Outdoor Educator/Guide for several years, and I recently brought a group of 12 to the High Sierras and used this pump by recommendation. We were pumping mostly from sources that were SO CLEAN, it was tempting not to just fill up my Nalgene and be done with it--- especially after struggling with this pump. At first it blew my mind how quickly the pump worked for moving mass quantities of water. A+ there. Then, although we back-flushed frequently, the pump became painfully slow and difficult to use. By DAY 3 into our 15 day trip it was completely worthless! At that point, my fellow guides and I worked for about 2 hours!!! on this thing trying to salvage it. NOPE. Luckily, I believe that moving parts have a propensity for failure in the backcountry haha, and always back up my water sanitation system with time-tested Iodine. Thank god, because our trip would've been over. BOTTOM LINE: I think that for a SINGLE person pump, for SHORTER trips- where mass amounts (40-50 litres per day) of water are NOT expected: this is a fantastic pump! It's fast, light, & packs small. Home maintenance/cleaning may be extensive, but outside you'll notice a big difference from other pumps. (B+) HOWEVER, For any realistic expedition (ie, lots of water needed and frequent use), this Pump needs to go back to the design table stat! because it was really and truly terrible. Even back-flushing every 8-10 litres (as per instructions), it couldn't handle the quantities we were dealing with. Epic FAILURE.
HBrad at Backcountry.com on 10/19/2008
Extremely disappointing
Rating:
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.
Struzel at Eastern Mountain Sports (EMS) on 07/28/2008
Not sure what went wrong
Rating:
A group of 7 of us went into the Sierra on a 3 day trip. We were using my old Pur filter which has been a trusty unit for 10 years. But then my friend (who doesn't backpack much) pulled this thing out of her pack. I got first crack at using it, and I was blown away. It pumped my platypus full in less than 60 seconds. I couldn't believe how small this thing is and how smart the design is. However, my opinion changed later that night when I borrowed it again, and could barely get it to function. Instead of seconds, it took 10+ minutes to pump the same amount of water. Granted, I don't know what happened in the intervening hours, but I don't think the filter was misused by anyone. All the water we were filtering was very clean and clear. The next morning I took it apart and couldn't find anything dirty, clogged or otherwise gummed up. Still, it refused to pump water at any kind of reasonable rate. At that point, it was essentially a tiny workout device.
Steve_W at Backcountry.com on 09/16/2008
Not my favorite
Rating:
I've used water filters in the Sierras since the late 1980s and was hoping that this highly rated unit would make the act of pumping less of a chore. When new, the thing really flows, but it only takes a few days and the filter will clog, even though I was using it in rather pristine clear water with prefilter. After 18 days in the mountains and only maybe 50% of the water we needed the flow was down to a trickle even with a lot of pressure applied on the pump. The worst part - the alleged back-flush option is a virtyual no-go. I sure could not figure out how to do it on and off the trail, and I am somewhat of an engineer. The thing simply doesn't budge when put together in backflush orientation. This year I plan on doing what most ultralight hikers do: bring a small bottle of bleach for water that may be suspect. Lighter, failproof, and considerably less aggravating than a pump that starts out fast but turns into a clogged pain after just days of use.
Peter Burke at Backcountry.com on 02/02/2009
Not worth the frustration
Rating:
I had trouble with this one on the trail, even after following directions. At first it did filter quite fast, but did require some effort. At exactly 8L, this filter slowed to a dribble, obviously indicating a backflush. After fussing to reverse the valves, the backflush procedure didn't work as well as I would have hoped. It was still difficult to pump water through, and even a long back flushing would not improve it. In addition, the intake side of the pump would often come loose during pumping, spraying water everywhere. The pre-filter float also wouldn't stay submerged enough or face down effectively in the water. I ended up going for an extra ounce or two with the Autoflow gravity filter, and have been so much happier. No pumping, simplistic back flushing, water storage, backcountry shower, etc.
Steve Masters at Backcountry.com on 08/11/2009
"Be careful - Read the reviews elsewhere"
Rating:
I took this out on a long trip, and at first it worked wonderfully. But it slowed down extremely quickly, to the point that it was a massive workout to pump even 1 liter. I backflushed it regularly per directions (every 8 liters), which is a pain, and I also never dropped it, let it freeze, etc. According to specs, the cartridge should last 1000 liters; I estimate I got no more than 150 liters, with the last 100 a huge ordeal. A friend who was with me at both the beginning & end of the trip was shocked at the difference: he got an altitude headache after taking forever to pump just 2 liters. Read the reviews elsewhere, like at rei.com, & you'll see many similar stories!
Stephanie at Moosejaw on 10/05/2009
Nice idea but not working in practice
Rating:
Used it on a 10 day trek in Ladakh where the water was very clear. The pump worked great and really fast for the first 10 liters or so, after that it went slower and slower, even with regular back flushing. I think I got about 50 liters out of it when no back flushing could restore it to a usable state. As said the water was already clear to begin with so this was quite disappointing. Fortunately we could still boil the water and there were several springs on the way that proved safe. Fortunately I got full refund. Next time one I'll get one of the ceramic filters, they are harder pump and slower, but at least the keep working and can be cleaned more easily.
krp2486391 at Backcountry.com on 10/17/2008
Fool me twice...
Rating:
Worked great in sink, terrible on Vancouver Island's North Coast Trail and later (with a new one) on Vancouver Island's Strathcona Park. on the NCT, murky creek water clogged the filter and backflushing on trail would not improve pumping speed/effort within 60% of original levels. Thorough backflushing in sink at home returned filter to 80% of original pumping speed/effort. Replaced with a new one and took to the alpine (nice clean water) and had the same problems. Backflushing this time on the trail and extensively at home only replaced the unit to 60% of original values. Would not recommend this. IMO it's job should be to filter water for you, no matter where you are. It is amazingly light and small though (and originally pumped wicked fast)
prairiefir2153883 at Backcountry.com on 09/16/2008
HyperFail
Rating:
In August and September of 2008 this was the filter three very experienced backpackers relied on in the High Sierra. Although there was never any visible contamination in the parts of the streams and high altitude lakes we were taking our water from, this filter worked as advertised for only the first day, after which its performance deteriorated so rapidly that, by the 3rd evening (despite multiple meticulous cleanings and back-flushings) we were concerned we would have to cut our trip short since it was taking about 12 minutes per liter and getting progressively harder to pump. On the plus side, it's so small that keeping it (from freezing) in your sleeping bag overnight is a non-issue.
'K2' at Mountain Gear on 06/26/2009

Show all negative reviews...

	MSR Hyperflow Maintenance Kit	$13.95 - $19.95
	MSR Hyperflow Prefilter Replacement	$13.95 - $19.95
	MSR Hyperflow Replacement Cartridge	$30.95 - $39.95

	MSR Autoflow Microfilter Hiking & Camping > Water Treatment	$78.95 - $89.95
	MSR DromLite - 2 Liter Hiking & Camping > Water Bottles & Flasks	$25.00
	MSR Dromlite with Fill Handle Hiking & Camping > Water Treatment	$24.95 - $28.95
	MSR Hydromedary System Hiking & Camping > Hydration Pack Accessories	$32.95
	MSR MiniWorks EX Hiking & Camping > Water Treatment	$76.95 - $89.95
	MSR SweetWater Microfilter Hiking & Camping > Water Treatment	$62.95 - $79.95

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MSR MiniWorks EX Water Filter	Cascade Designs Msr Miniworks Ex Water Filter	MSR MiniWorks EX

Cascade Designs MSR Sweetwater Purifier System	Steri Pen Steripen Safe Water Pack	MSR SweetWater Microfilter

Are you kidding me?
Rating:
I've been backpacking and climbing for over 20 years (I hate saying that...) and this is the best thing I've ever used to filter water. I'd been using it off and on on shorter trips in the Cascades and was blown away - but that's easy for most filters to accomplish. So, the proof was to be found on an 8-day trip in the High Sierras and I even bought a spare filter cartridge just in case. My research had turned up some folks griping about clogging etc. but I can only imagine that they were doing something wrong or filtering REALLY silty water. True - it does slow down if you are filtering really silty water. I noticed the difference between a glacial-fed lake and some others that were lower - but we backflushed as recommended (every eight liters, or about once every other day for two people) and had no problem whatsoever. And for those worrying that backflushing that much is too much - think again. You'll never even consider going back to another filter after realizing how much easier the Hyperflow is. We got used to backflushing right as we finished filtering and it only added about 1-2 minutes - Far less than the time saved by the Hyperflow's speed and the overall ease of pumping more than makes up for any inconvenience you thought you might have felt. We even started to routinely do the filter test at the same time because it was so easy to do in the process. I will say that I wouldn't use it in direct glacial meltwater and I have no idea how it would do in the Canyonlands or other places with really murky water, but I'm guessing it might not be the best choice there. However, if you want to get a superlight, and really small filter for taking on alpine trips or anywhere the water is pretty clear, I can't imagine a better set-up. I even take it on day hikes and car-to-car alpine climbs now and pump as I go. It beats lugging two camelbaks around in my pack or dealing with the taste and hassle of iodine. Oh, and I still haven't touched that spare filter cartridge.
jim2365549 at Backcountry.com on 08/18/2008
fantastic - after some trouble
Rating:
When I bought this filter a few weeks ago, I tried it out at a stream near my house and it was amazing. However, it became less amazing about six hours into an eight day camping trip. At first it was just difficult and slow, but later the flow reduced to a trickle. I was backflushing every 6-8 liters (which is really easy and not much hassle at all once you've done it a few times - just make sure you have a nalgene or platypus. Klean Kanteen also makes an attachement which should work.) Anyways, we ended up boiling water for the last four days. When I got back, I called MSR about it. They asked for my name, address, and the serial number, and then sent one out right away. The call took about two minutes. Now my hyperflow is working perfectly. If you want to be on the safe side, you might consider buying this from a smaller camping store, because they would have the most current ones (having to restock more often). If you decide to buy it on backcountry, just make sure to call MSR and check that serial number. It really is a great little filter; It comes in a double sided carrying pouch with simple instructions. I have done dayhikes with just this - no water bottle - but that was mostly for the fun of it. Like having a water fountain in your pocket.
ice2536943 at Backcountry.com on 08/13/2009
A true winner!!
Rating:
This is a great little filter from MSR, I have used most brands and models that have been on the market for the last 20+ years and this is revolutionary. This has replaced my MSR Miniworks on most of my trips. I have pumped an estimated 600 liters of water, without fail. As with every piece of equipment I own, I do have a few complaints. One is that the disassembly for backflushing can be difficult in the field, especially if the inside thread assembly has been overtightened. The other is that the inflow end (the part that goes in the water) tends to want to turn over and sucks a little to much air. But all in all, it is a great filter and both of my complaints can be solved once you get use to your equipment. One more thing, I am not at all surprised by the love it or hate it responses that this product has received. It reminds me many years back when the MSR Whisperlite stove became all the rage, with accolades from all the major mags. I bought one and hated it with a passion, and being a sucker exchanged it 3 times before I decided not to let it compromise my safety any longer. MSR is always cutting edge, maybe the have a QC or outsourcing problem.
sierrascott at Eastern Mountain Sports (EMS) on 06/17/2009
Manufacturer Comments
Rating:
Note from the manufacturer: We have identified a flow performance issue with some of the hollow fiber filter cartridges contained in MSR HyperFlow microfilters. The performance issue DOES NOT affect the product's ability to filter safe drinking water but can be frustrating as the flow rate of the filter may not perform to product specifications. The issue has been rectified and all filter cartridges currently in production for the MSR HyperFlow microfilter perform to flow specifications. It is our goal to provide you with the most innovative and reliable outdoor gear available when you need it most. You can be confident in the efficacy of the hollow fiber filter technology, but if you are experiencing a less-than-expected flow rate on the MSR HyperFlow microfilter right out of the box or after back flushing, we want to know. Please contact our Customer Service Department at Cascade Designs, Inc. by calling 1.800.531.9531, and we will send you a valid replacement filter element at no charge for any filter cartridge manufactured prior to November 11, 2008. Please have your filter cartridge element handy as we will ask for the serial number for our records and manufacture date verification. Please also check www.msrgear.com for improved MSR HyperFlow microfilter instructions and an instructional video on proper back flushing of the unit.
Anonymous at Altrec on 05/26/2009
Great filter
Rating:
I am not sure where and how some of the reviewers used this filter, or why they are writing such negative reviews. I have been hiking and using filters now for 15+ years (Katadyn, Sweetwater - and they also work fine, but slower). Just used this one again on 7 day trip up north (Fort Nelson area)for group of 3. Water was mostly from creeks of various clarity. No problem with the float end at all, actually it works great! We had 3 filters, but after the first use we only use HyperFlow. My partners wanted to buy it from me right there! Easy to use, very light, fastest flow by far when compared to anything comparable. All filters plug up and slow down in silty water, so what? It is so easy to back flush (best to do right after watering up and it takes me about one minute). True, I have not use it to try to pump water from a puddle so far, but I had only do it once in last 10 years. I am sure it can be done, but it may take a little longer to get your 4-6 liters done. For now I say if you like lite and fast, buy it, you'll love it! Excellent gear!
petbug at Backcountry.com on 09/08/2008
small light fast winner!
Rating:
Assuming it holds up well...I think MSR has a winner with the tiny, lightweight,EASY pumping Hyperflow. I was using a MSR Miniworks EX that filtered well, but it wore me out getting water and bashed my knuckles. The Hypeflow with the horizontal bike-pump action fills up my camelbak VERY quickly and easily. I just picked up the Camelbak Hydrolink filter adapter from REI and added a tiny chunk of the inlet hose to the adapater piece and now its plug and play to switch from mouthpiece to filter connection. You can fill a camelbak with the pack on your back. This is a DELICATE unit(don't drop it!) and I suspect REQUIRES regular simple maintenance. I do the 2 drops of bleach in a liter of water back flush after every hike that I use it and then just EASILY break it all down and spread it out to dry. I could see the tiny filter area clogging easily if you just put it away and let algae grow inside it. Its SUPER easy to break down and backflush is simple. I just use it for dayhikes. Now I can carry a lot less water to even further reduce my pack weight, since its so quick and easy to use.
Thom aka Boot Up at REI on 05/04/2008
Great filter but it may not be what you are looking for.
Rating:
Disclaimer: Don't buy this filter if you plan to use it primarily for more than two people. I use this on solo backpacking trips and it works great as long as you know how to use it. The pump must be backflushed FREQUENTLY in order for it to work well consistently. A lot of people give this filter a bad rap but they have most likely had bad experiences because they got the wrong filter for the job. I love my microfilter. It is light and pumps really quickly (although you do have to take into consideration all the time you must spend maintaining the filter). My only complaint is that screw top for nalgenes/hydromedary bags leaks a bit. As long as you hold the nalgene or hydromedary completely upright while pumping into it through the accessory top you should not have a problem. However, this is much more difficult to pull off with a hydromedary bag.
Brendan Casey at Backcountry.com on 02/04/2009
possible design flaw
Rating:
first off, this is an amazing product. it filters much faster than any similar filters i've found in my research. i am, however, concerned over a possible design flaw. one step in disassembly is to use the filter cylinder (red tube on the intake side) to unscrew the piston in order to get at the actual filter. this works by pulling the cylinder to a locked position with the piston and simply turning. the problem is that the section of the plastic that locks is very small and can easily wear down much like the edges of a nut might wear down when turned too tight. if this step in the process works on yours, then you probably have the best filter on the market--for the price--but my advice is to pay very close attention to this part. if it breaks, then you cannot replace the filter component and the whole thing becomes useless.
chris530 at REI on 06/08/2008
great little gadget
Rating:
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.
greengoat at Eastern Mountain Sports (EMS) on 08/03/2008
A week without problems
Rating:
I filtered for myself and allowed others to use my HyperFlow over a week in Yellowstone NP. A friend did the same with his HyperFlow, and neither one of us had any problems. I benefited from a suggestion, though. I put an MSR SiltStopper II between the HyperFlow's pre-filter and main pump, and it definitely cut down on the need to backflush the HyperFlow. I'd guess my friend (without the SiltStopper) backflushed at least twice as much as I did during the trip. There's even enough room in the HyperFlow's included pouch to keep the pre-filter & SiltStopper in the mesh side, and the pump in the other. I always take some Katadyn Micropur tabs as a back up, but I have no complaints with the HyperFlow.
ken2740405 at Backcountry.com on 09/30/2009

Information for you before you buy
Rating:
I thought that I had done all of my research on this product before I bought it, but upon it's arrival I found some information in the provided literature that was not anywhere else that I had looked. This filter uses a "hollow fiber" filter. This is exactly what it sounds like. When you look at the end on the filter, you see what looks like a bunch of the ends of tiny straws. The upside is that this filter filters well, pumps very easily, and pumps a lot of water fast. After reading the reviews, and doing my own research I was sold. When I got the filter, I noticed a little "warning" in the instructions that says you shouldn't let the filter freeze, or be stored below 0 deg Celsius. If this happens, The filter will be damaged, and may not filter out all the nasties that can make you so horribly ill. I can only deduce that as the filter is a bunch of tubes, that if it were to freeze, the resulting ice expansion would shatter the tubes. This seems like a major over site to me. I have been out ALOT when the morning dew was definately morning frost. So, I really have to wonder if on the next morning I wake up like that, I will also get to wake up to a busted water filter. The instructions also relate that a drop from as little as .9 meters can damage the filter resulting in nasties in your water again. With all that said, it really is a joy to use. It pumps really fast, and is well designed other that the obviously delicate filter. I'm still taking it out this season, but I'm bringing extra treatment tabs, just in case.
Free Range Kevin at REI on 05/07/2008
Decent product with room for improvement
Rating:
I purchased this a few months after it came out and decided to give it some time before I post a review. I've taken this on a few weekend trips and a handful of longer trips as well. Like every other review this thing was amazing at first and then slowed down after the first few trips. I backflushed multiple times after each trip, but it didn't get better. After overhearing a conversation at an outdoor shop in Austin I heard that MSR had a manufacturer defect with the first few batches that went out. I called and sure enough mine was one of the ones recalled so a new filter is in the mail. Cascade Designs (maker of MSR products) is a great company with great customer service. I'm eager to try the new filter. I gave this 3 stars b/c it is in incredible filter, but it could use a little more R&D. I have no plans to take it back since my backpacking trips are usually small 1-3 person groups and this is the perfect size for me.
Nate Boone at Backcountry.com on 05/28/2009
Take Tablets this thing CLOGS FAST
Rating:
On the 1st day of my backpacking trip I filtered clean running water with this filter and it worked great. The 2nd day of the trip I stopped to filter and the MSR Hyperflow was super hard to pump so I tried to backflush with the small amount of water I had left with no luck at all. We ended up boiling water for the rest of the trip and bad mouthing MSR for it. When I returned home I eventually got the filter to backflush which is a pain. The MSR Hyperflow does not pump as easy as it did when it was NEW. The documentation recamends taking a extra cartrige on longer trips, from my experience that means 2 days! I'm not sure about the freezing, shake it dry. Dropping it?? It's a little weak but it is LIGHT. I'll keep tring it and backflush the filter everytime, it takes time so that kills the super fast pumping time. I knew it was too good to be true!
Gaqua at REI on 06/04/2008
Review Title
Rating:
I found that this pump was working well for me, until i have found the same flow problem with my filter. I have taken it to 3 overnight backpacking rips and one two nighter. I noticed that on the last trip, things started to slow down quite a bit. I have watched the videos and read all instrustions. I know how to buckflush properly, and have done so more that needed to prevent this loss in flow. I am going to try a new filter, but if it does the same thing, i will find another filter. Also MAKE SURE to backflush AWAY from the water. The little black valve can fall out and roll into the creek. IT DOES NOT FLOAT!! All in all, i find this filter to be enough for a single backpacker who is looking to save weight.
Mike Greene at Backcountry.com on 08/21/2009
MSR will send you a new cartridge
Rating:
I own one of the first of these released. I thought, "great... light, effective, fast. I'm so cool and my butt is covered." But..... It is as everyone says...starts out really fast and easy, then really goes downhill quickly Anyhow, I just discovered, purely by chance (gee, thanks MSR) that all of you who bought before 02/09 can contact MSR for a new filter cartridge. The info is on their homepage but the number is:1-800-531-9531. We'll see if that solves the problem If it can live up to what it once was and the entire reason I bought it, It is a nice little unit. Just in case, I'll carry some chlorine tablets for the summer. New cartridges to the masses.
Phil maher at Backcountry.com on 04/20/2009
Not for me
Rating:
I used it for awhile and didn't have the problems others had with flow rate. The only time I needed to backflush it was when I used it in muddy water. The problem I had with it and the reason I returned it was because of the freezing issue. I wanted something I could use all year. I understand you can't use it if it's frozen but I didn't want a filter that when it does freeze I need to test it and possibly buy a new filter. I exchanged it for the Sweetwater filter. No freezing issues and no need to sleep with it in my sleeping bag and keep inside my jacket all day.
sha2847511 at Backcountry.com on 07/11/2009
"Great for small volumes, practice cleaning at home"
Rating:
The Good: This filter is great for 1-2 people. It pumps fast and is amazingly lightweight. The Bad: The filter is hard to clean in the field and requires that you still have clean water. The process to clean the filter is complicated and should be practiced a few times at home before taking the filter into the field. Verdict: If you're looking for a lightweight filter and don't mind the maintenance this filter is amazing. If you're looking for something bombproof or for large groups this isn't the filter for you.
Chris at Moosejaw on 10/01/2008

MSR Hyperflow Microfilter

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MSR Hyperflow Microfilter Reviews Summary:

Positive Reviews:

Are you kidding me?

fantastic - after some trouble

A true winner!!

Manufacturer Comments

Great filter

small light fast winner!

Great filter but it may not be what you are looking for.

possible design flaw

great little gadget

A week without problems

Negative Reviews:

Works for about a day

Professional Outdoor Guide- bad product

Extremely disappointing

Not sure what went wrong

Not my favorite

Not worth the frustration

"Be careful - Read the reviews elsewhere"

Nice idea but not working in practice

Fool me twice...

HyperFail

Neutral Reviews:

Information for you before you buy

Decent product with room for improvement

Take Tablets this thing CLOGS FAST

Review Title

MSR will send you a new cartridge

Not for me

"Great for small volumes, practice cleaning at home"