bobwrote a review of MSR HyperFlow Microfilter on January 18, 2014
Familiarity: I've put it through the wringer
Initially planned to use this for a PCT thru-hike and I'm SO glad I didn't. Just normal use on weekend trips makes me swear with frustration in trying to backflush at home in my kitchen, let alone outside. WHY would a company make a product that is so finicky?! You have to get the backflush just right or it won't work and the directions in the package are poor so you have to remember how to do it EXACTLY. I was successfully able to back flush with a lot of fiddling for the first few months, and now it's randomly stopped working. I have followed along with the maintenance video, no luck. Also, notice that in the video the pump is fully extended when he puts it back together in prep for backflush, tells you not to pump, and then the next shot is the pump being extended back out. Frustrating. I also don't take this on long trips because I hate bladder systems and nalgene, and there's no way easy way to back flush without one. It is fast, and compact, and makes great tasting water, but it's easy to loose the lid--it really needs a strap to hold on to it. The stupid prefilter also CONSTANTLY flips upside down making it almost impossible to get water. I either have to tuck it under a branch or stone or hold it in the stream just right. Overall, not worth the hassle.