User Review: MSR HyperFlow Microfilter
My friends call it the MSR "Faucet". Seriously, I can't pee into a bottle as fast as this thing can fill one! Filtering daily water for a party of 4 takes only a few minutes.
I back-flush mine every day (or so) and have had no problems with reduced flow.
I did end up breaking a flange off the filter cartridge - rendering it useless. (Entirely my fault, I accidentally tried to screw it back together the wrong way.) Maybe could've been built more idiot-proof?
Either way, highly recommended! (If you aren't an idiot.)