User Review: MSR HyperFlow Microfilter
Price Paid: $80
Under ideal conditions - i.e. practicing with it using my tap water - it did work great. Very fast, easy to pump, lightweight, the back flushing set up with the little valves was a little daunting but not unmanageable.
Then I took it with me in the back country. I pumped less than two liters before it plugged up. I had to work so hard to get enough water to back flow it then it made me so sad to use all that hard earned clean water to send it right back out and even then it was still slow. AND, I don't know who gets the prefilter thing to float on top of the water - I have to weigh it down with a rock - but not too deep or it just sucks up dirt off the bottom. or it gets air.
I like the set up, I like the direct connect to nalgene bottles, I like using it while standing at my kitchen sink but in the field it has been worse than worthless because I know I can't trust it. I wish I had my ceramic filter back!