Just used the MSR MiniWorks EX on the trail for 3 days having purchased it last week at a local outdoors store. I pumped 4 litres the first day with no issue, pumped 11 more litres the 2nd day, cleaned the filter not because it had slowed in performance, simply because I figured I should, pumped an additional 2 litres the following day with no issues. I truly can't understand where people are having problems, especially when they are claiming to be pumping from clear water sources... only thing I could imagine the problems I'm reading in these reviews is glacial streams with high volumes of rock flour... but again the complaints claim clear water...
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