Jason M.wrote a review of MSR HyperFlow Microfilter on October 12, 2016
Familiarity: I've put it through the wringer
I have had mine for a few years and used it on a regular basis in and around western Wyoming - hunting, climbing in the Winds and Tetons, etc. I've had none of the problems that others have listed. I have back flushed the filter at home a few times for the heck of it. It continues to filter water quickly with minimal effort. The pre filter has a velcro strap to hold a rock or such. This holds the pre filter at the bottom of the creek or wherever you place it. Some complain about this but it's an easy thing to do to keep your pre filter where you want it and not swimming around. My only complaint is that mine weighs more than the listed weight on this website. With filter, hose, pre filter and bag I get a weight of 9.3 oz. That does not include the msr bladder attachment or the paperwork. Only a couple of oz difference but it adds up.