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MSR Hyperflow Microfilter Review

MSR Hyperfilter
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Price:  $100 List | $99.95 at REI
Pros:  Lightest and most compact pump filter, 1000 liter filter life.
Cons:  Complicated backflush maintenance that needs to be performed often.
Manufacturer:   MSR
By McKenzie Long ⋅ Senior Review Editor  ⋅  Aug 25, 2014
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Our Verdict

If you want a water filter reminiscent of a SuperSoaker Water Gun, the MSR Hyperflow Microfilter is the one. It is light, small, has a quick flow rate, and can be used to douse your hiking partner. As the lightest and most compact filter other than the Platypus Gravityworks Water Filter, it is the most desirable filtering system to carry on long hikes. It does not purify for viruses like Aquamira Water Treatment Drops or the First Need XL, but it does strain out particulate. Its primary downfall is a complicated back flush system that is directed to be performed every eight liters.

Our Analysis and Test Results

Lightweight and compact, the Hyperflow is one of the smallest pump filters on the market.

Performance Comparison

The MSR Hyperflow Microfilter is the lightest and most compact of all the pump filters  weighing only 9.5 oz. including the bag.
The MSR Hyperflow Microfilter is the lightest and most compact of all the pump filters, weighing only 9.5 oz. including the bag.


The hollow fiber filter in the MSR Hyperflow Microfilter is effective against bacteria and protozoa, but not viruses. It does filter out particulate and requires a rather involved back-flushing process.


The Hyperflow is the lightest and most compact filter system, weighing 9.5 oz. including the storage bag, so it is the most desirable to carry if your preferred method is a pump.

Time Before Drinking

Only requiring one minute 30 seconds to pump a liter, this pump is fast with a decent flow rate.

Ease of Use

The pump itself is simple to use, and feels like pumping a Super-Soaker Water Gun. The pre-filter seems to flip upside down easily rather than staying facedown in the water, but this is minor. Where this filter stops being incredibly simple is the back-flushing, which involves unscrewing it in two places and removing and reversing small valves. Normally this maintenance would not be that big of a pain, except that it is recommended to be done every eight liters, which is very frequent and becomes a drag on a long or multi-day hike.

Durability/Uses Before Maintenance

There are a lot of user reviews online that complain about this filter getting clogged easily and not working. MSR issued a recall of filter cartridges in 2009 to improve the flow of the cartridges, which may have solved the problem. In our experience with the Hyperflow, we have not had troublesome clogging and have found the system to flow quite well. If you have used the Hyperflow please leave a user review comment, because we are very interested in how it is performing for others.

On one hand, we love that the Hyperflow can filter 1000 liters before needing a replacement cartridge. But on the other hand, the backflush process in this baby is rather complicated, involves small parts that are easy to lose, and is frustrating. It is suggested that this be done every eight liters, which is quite often and would be tedious on a long distance hike.


The taste of the water remains unchanged.

Best Application

Since this filter is so light, it is the best pump to carry on long hikes or backpacking trips where weight is a concern. Often people forego carrying a filter because they are too heavy, and the Hyperflow makes a case for bringing one anyway to keep yourself from getting sick.


At $100, this filter is slightly more expensive than the standard pumps like the MSR Sweetwater Microfilter and the Katadyn Hiker Pro and less than a gravity-fed filter like the Platypus Gravityworks Water Filter. In our opinion, spending an extra $20 for a gravity filter is worth it.

McKenzie Long