Collin B.wrote a review of MSR HyperFlow Microfilter on October 27, 2015
I have had this filter for 2 years now and have filtered over a hundred liters. This filter can have a very short life but can also last a along time. The reason for this is how often the unit is cleaned relative to the amount of water pumped. The longer I have waited to clean the filter the greater the frustration cleaning it. I have also found that if you back flush immediately after filtering the best results are found. I think of this as a function of pressure. From what I can tell you cannot create the same amount of pressure with pulling a vacuum as you can with pumping. The harder you pump the hard it is to clean. To combat the lack of pressure from suction I built and adapter for a faucet to back flush at high pressures. In the backcountry I will never filter more than 3 liters without back flushing with half a liter. This is all I have to personally filter at one time. With that being said I really do like this filter in certain situations. This filter is light and compact, which makes it great for personal use but due to that maintenance not good for groups. I use this filter for solo trips and on every day hike because I only need to filter small quantities of water and want to keep my pack light. Back Flushing is slightly time consuming but just takes practice. This filter may pump fast but is not for impatient people due to cleaning.