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  • Backpacker April '08: ''The HyperFlow is so fast and light it converted several editors who had sworn off filters in favor of chemical treatment.''
  • Hollow fiber technology offers an extremely high flow rate of 2.75 liters per minute
  • At just 7.8 oz., the HyperFlow is the lightest, most compact pump filter created by MSR
  • Filter physically removes particles, protozoa, and bacteria down to 0.2 microns in size, including giardia, salmonella, cryptosporidia and others
  • Pump is fully field maintainable and does not require tools for complete disassembly
  • Included Quick-Connect™ bottle cap interfaces with MSR hydration products, Nalgene bottles and other containers with 63mm threaded openings
  • Quick-Connect™ cap allows the pump to attach directly to the bottle or hydration bladder for the most convenient filling
  • Included prefilter attaches to the end of the intake hose and blocks larger contaminants from entering the microfilter
  • Prefilter floats near the surface of the water to avoid intake of contaminants located at the floor of your water source
  • Over-molded end caps on the pump provide an excellent grip and pumping comfort
  • Adapt the HyperFlow pump into a pump-free gravity filter with the HyperFlow Gravity kit, sold separately

Made in USA.

MSR has identified and fixed a flow rate issue affecting some cartridges in MSR HyperFlow microfilters. As of February 11, 2009, all filter cartridges sold by REI perform to flow specifications.



View all MSR Pump Water Filters

REI membership

Specs

Best Use Backpacking
Filter Type Pump
Filter Medium Hollow fibers
Removes/Destroys Protozoa and Bacteria
Pump Force Unavailable
Pump Strokes Per Liter 20
Output 3 liters per minute
Housing Material ABS plastic
BPA Free Yes
Field Cleanable Yes
Dimensions 7 x 3.5 inches
Weight 7.8 ounces
Rated 5 out of 5 by from Excellent Product- 60 L This product performed marvelously while in the Appalachian back country. I brought my MSR mini-water works and my uncle brought this product. The HyperFlow pumps consistently, and much faster than my MSR product, so much so that we stopped using mine, and only used his. It provided water for all 6 of us for drinking and cooking on the trip for several days. We easily pumped 60 L of water without complications or malfunctions. The floater does need to be reworked so that the filter faces down but this is an easy fix. I liked this product so much I bought my own and have donated my MSR to the local Boy Scout troop. I highly recommend this product.
Date published: 2015-10-14
Rated 4 out of 5 by from Take care of it, and it will take care o The best filter out there, with a catch: It requires frequent back-flushing to work properly. I suspect that the users who complain that it stops working after a while aren't dilligent about back-flushing. You need to do it after every seven liters or so. The good news is that back-flushing is quick and easy. Basically, you flip a couple of plugs in the unit to reverse the flow and pump about a half-liter of water through the unit. It only takes a minute or so. If you are willing to live with the frequent maintenance, you are rewarded with the lightest, easiest, fastest filtration system on the market. To me, that trade-off is a no-brainer.
Date published: 2009-01-03
Rated 1 out of 5 by from Not so great I have a MSR Miniworks which I used for many years. I replaced it with a Hyperflow that I carried this past season for about 600 miles on the CDT. This little filter works great when new until the first time you filter some water that has sediment or organic materials in it. Then it plugs up so badly it can't be cleaned. Back washing helps a bit but it is a huge hassle and it just gets harder and harder to pump. The only way to fix it is to replace the filter cartridge which is very expensive, after which the entire cycle begins again. After two filter replacements I ended up going back to my Miniworks which works great except for the weight.
Date published: 2011-12-19
Rated 4 out of 5 by from a permanent addition to my pack I love this thing. I field tested it with another filter on a week long trek at the pictured rocks and the hyperflow really outshined. Really simple to use, I like the fact that it is essentially one moving part, as opposed to most other filters. I had no problems with clogging or difficulty pumping, and was able to backflush several times over the trip without any difficulty. A few little things: While the prefilter works great in streams and rivers, waves on larger water push it back to shore; but a rock or two easly solves that problem. And you can't allow water in the filter to freeze, so bring it in the sleeping bag with you on cold nights.
Date published: 2009-07-17
Rated 1 out of 5 by from poor performer I initially used this on a 3 day trip in Tuolumne Meadows - it pumped very easily, and quickly. No backflushing needed. I was happy. Then we took it on a 7 day backpacking trip in the Sierras. After day 1 it became harder and harder to pump, as someone else said, a gym workout. This, despite backflushing. Ultimately backflushing also proved impossible. We read and reread directions, took care to have no air locks, but to no avail. We also found that the prefilter floats upside down unless anchored by a rock or foot somehow, and the intake hose falls off occasionally. I am returning this as soon as I can get to the store. Very disappointing.
Date published: 2008-08-16
Rated 5 out of 5 by from This thing ROCKS Right out of the box and into the water this filter requires little prep. Light weight and compact, perfect for fast packing or adventure racers who don't fully trust or like chemical treatment. Pumps well, and with little effort can fill a camelback in no time. Not a fan of the bottle attachment, so I just put a small piece of hose on the outlet valve to minimize spill, and pumped away! Water quality was good, but this is more of a selection of water source than the pump itself. The prefilter likes to float around so air suck can be a problem, but a little thought and some small rocks can help with this problem. A great little pump!
Date published: 2008-04-21
Rated 1 out of 5 by from It was great while it lasted I take a week to two week back country trip every summer. I purchased a HyperFlow and it lasted many years with heavy use for those one to two weeks a year. The HyperFlow would make crystal clear water out of some very questionable water. Then one year on the ascent of Roan Mountain on the appellation trail, the unit broke and would not function at all we had to hike into town to buy bottles of water. I purchased another HyperFlow the next summer and took it on a multi-day kayaking trip. It broke the first day out. I really want to rate this product higher. When it works, it works great! But after having two units break in the field, I can no longer trust the HyperFlow to be their when I need it.
Date published: 2016-06-19
Rated 1 out of 5 by from Back to the drawing board! I agree the Hyperflow doesn't live up to its hype. On its first field use, a six-day Ansel Adams Wilderness backpack, the Hyperflow started out hyper-flowing but quickly became difficult to pump, and no amount of backflushing or other tinkering would cure the problem. It soon reached the point that my old, slow Miniworks would have outperformed the Hyperflow with the added bonus of being easy to clean and maintain. We ended up reverting to my buddy's Steripen and, when that failed, reliable but unpleasant chemicals. I've another six day backpack coming up and the Hyperflow will stay behind. . .probably at REI, where I plan to return it.
Date published: 2008-07-31
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If the filter isn't used how long is it's shelf life?

Asked by: johnhotdog33950
The hollow fiber filter inside of the HyperFlow Water Filter is very stable and does not have a shelf life when stored. The cartridge can filter approximately 1,000 liters of water (depending on water conditions) before it needs to be replaced.
Answered by: REIservice
Date published: 2016-09-12

I like the reviews and comments as I want to give up carrying 4+ L. for extended hiking in the Rockies. How can you tell when the filter has approached 1,000 L. filtration? Is there an indicator that indicates time to replace the filter? Thanks!

Asked by: Terry
​If the filter has been backflushed and water is very slow to come out, the cartridge should be replaced. MSR recommends backflushing this filter after filtering every 8 liters of water.
Answered by: REIservice
Date published: 2017-04-06

There are several complaints in the reviews about the unit becoming difficult to pump despite backflushing and following all directions. Has the factory analyzed these claims and offered an explanation. I would like to know what the issue is b4 buying.

Asked by: RHELO
The manufacturer has identified and fixed a flow rate issue affecting some cartridges in the HyperFlow microfilters. So, As of February 11, 2009, all filter cartridges sold by REI perform to flow specifications.
Answered by: REIservice
Date published: 2017-03-20

How long dies this filter last? I have had mine in for a couple years but haven't used it consistently I am not sure if the filter needs to be replaced or not. 

Asked by: BREWANDERS
The HyperFlow Water Filter has a cartridge life of approximately 1,000 liters.
Answered by: REIservice
Date published: 2016-09-05
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Reviews

Rated 5 out of 5 by from Excellent Product- 60 L This product performed marvelously while in the Appalachian back country. I brought my MSR mini-water works and my uncle brought this product. The HyperFlow pumps consistently, and much faster than my MSR product, so much so that we stopped using mine, and only used his. It provided water for all 6 of us for drinking and cooking on the trip for several days. We easily pumped 60 L of water without complications or malfunctions. The floater does need to be reworked so that the filter faces down but this is an easy fix. I liked this product so much I bought my own and have donated my MSR to the local Boy Scout troop. I highly recommend this product.
Date published: 2015-10-14
Rated 4 out of 5 by from Take care of it, and it will take care o The best filter out there, with a catch: It requires frequent back-flushing to work properly. I suspect that the users who complain that it stops working after a while aren't dilligent about back-flushing. You need to do it after every seven liters or so. The good news is that back-flushing is quick and easy. Basically, you flip a couple of plugs in the unit to reverse the flow and pump about a half-liter of water through the unit. It only takes a minute or so. If you are willing to live with the frequent maintenance, you are rewarded with the lightest, easiest, fastest filtration system on the market. To me, that trade-off is a no-brainer.
Date published: 2009-01-03
Rated 1 out of 5 by from Not so great I have a MSR Miniworks which I used for many years. I replaced it with a Hyperflow that I carried this past season for about 600 miles on the CDT. This little filter works great when new until the first time you filter some water that has sediment or organic materials in it. Then it plugs up so badly it can't be cleaned. Back washing helps a bit but it is a huge hassle and it just gets harder and harder to pump. The only way to fix it is to replace the filter cartridge which is very expensive, after which the entire cycle begins again. After two filter replacements I ended up going back to my Miniworks which works great except for the weight.
Date published: 2011-12-19
Rated 4 out of 5 by from a permanent addition to my pack I love this thing. I field tested it with another filter on a week long trek at the pictured rocks and the hyperflow really outshined. Really simple to use, I like the fact that it is essentially one moving part, as opposed to most other filters. I had no problems with clogging or difficulty pumping, and was able to backflush several times over the trip without any difficulty. A few little things: While the prefilter works great in streams and rivers, waves on larger water push it back to shore; but a rock or two easly solves that problem. And you can't allow water in the filter to freeze, so bring it in the sleeping bag with you on cold nights.
Date published: 2009-07-17
Rated 1 out of 5 by from poor performer I initially used this on a 3 day trip in Tuolumne Meadows - it pumped very easily, and quickly. No backflushing needed. I was happy. Then we took it on a 7 day backpacking trip in the Sierras. After day 1 it became harder and harder to pump, as someone else said, a gym workout. This, despite backflushing. Ultimately backflushing also proved impossible. We read and reread directions, took care to have no air locks, but to no avail. We also found that the prefilter floats upside down unless anchored by a rock or foot somehow, and the intake hose falls off occasionally. I am returning this as soon as I can get to the store. Very disappointing.
Date published: 2008-08-16
Rated 5 out of 5 by from This thing ROCKS Right out of the box and into the water this filter requires little prep. Light weight and compact, perfect for fast packing or adventure racers who don't fully trust or like chemical treatment. Pumps well, and with little effort can fill a camelback in no time. Not a fan of the bottle attachment, so I just put a small piece of hose on the outlet valve to minimize spill, and pumped away! Water quality was good, but this is more of a selection of water source than the pump itself. The prefilter likes to float around so air suck can be a problem, but a little thought and some small rocks can help with this problem. A great little pump!
Date published: 2008-04-21
Rated 1 out of 5 by from It was great while it lasted I take a week to two week back country trip every summer. I purchased a HyperFlow and it lasted many years with heavy use for those one to two weeks a year. The HyperFlow would make crystal clear water out of some very questionable water. Then one year on the ascent of Roan Mountain on the appellation trail, the unit broke and would not function at all we had to hike into town to buy bottles of water. I purchased another HyperFlow the next summer and took it on a multi-day kayaking trip. It broke the first day out. I really want to rate this product higher. When it works, it works great! But after having two units break in the field, I can no longer trust the HyperFlow to be their when I need it.
Date published: 2016-06-19
Rated 1 out of 5 by from Back to the drawing board! I agree the Hyperflow doesn't live up to its hype. On its first field use, a six-day Ansel Adams Wilderness backpack, the Hyperflow started out hyper-flowing but quickly became difficult to pump, and no amount of backflushing or other tinkering would cure the problem. It soon reached the point that my old, slow Miniworks would have outperformed the Hyperflow with the added bonus of being easy to clean and maintain. We ended up reverting to my buddy's Steripen and, when that failed, reliable but unpleasant chemicals. I've another six day backpack coming up and the Hyperflow will stay behind. . .probably at REI, where I plan to return it.
Date published: 2008-07-31
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Questions & Answers

If the filter isn't used how long is it's shelf life?

Asked by: johnhotdog33950
The hollow fiber filter inside of the HyperFlow Water Filter is very stable and does not have a shelf life when stored. The cartridge can filter approximately 1,000 liters of water (depending on water conditions) before it needs to be replaced.
Answered by: REIservice
Date published: 2016-09-12

I like the reviews and comments as I want to give up carrying 4+ L. for extended hiking in the Rockies. How can you tell when the filter has approached 1,000 L. filtration? Is there an indicator that indicates time to replace the filter? Thanks!

Asked by: Terry
​If the filter has been backflushed and water is very slow to come out, the cartridge should be replaced. MSR recommends backflushing this filter after filtering every 8 liters of water.
Answered by: REIservice
Date published: 2017-04-06

There are several complaints in the reviews about the unit becoming difficult to pump despite backflushing and following all directions. Has the factory analyzed these claims and offered an explanation. I would like to know what the issue is b4 buying.

Asked by: RHELO
The manufacturer has identified and fixed a flow rate issue affecting some cartridges in the HyperFlow microfilters. So, As of February 11, 2009, all filter cartridges sold by REI perform to flow specifications.
Answered by: REIservice
Date published: 2017-03-20

How long dies this filter last? I have had mine in for a couple years but haven't used it consistently I am not sure if the filter needs to be replaced or not. 

Asked by: BREWANDERS
The HyperFlow Water Filter has a cartridge life of approximately 1,000 liters.
Answered by: REIservice
Date published: 2016-09-05
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