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The MSR SweetWater Microfilter gives you an easy, dependable way to filter your water, and only adds 11 ounces to your backpack. This MSR water filter’s lever-action pump has a mechanical advantage that keeps you from breaking into a sweat while you’re pumping, and the filter eliminates 99.99% of all waterborne bacteria and common protozoan parasites. Simple brushing restores a clogged filter. Fold the SweetWater Microfilter’s handle flat for compact packing.