The Sweetwater Microfilter by MSR. Treading the middle ground between MSR's lightest and most durable filters, the SweetWater Microfilter makes water treatment easy. Simple, lightweight and versatile, it's the perfect water treatment option for light to moderate use, with the capacity to easily step-up to the demands of the occasional big trip. It pumps easily with a 4:1 mechanical advantage, producing 1.25L per minute and can easily be cleaned in the field without tools to restore flow rates.
So sorry, but only 4 items are allowed for comparison, so we're comparing the first 4. I blame the gnomes and so should you.
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