MSR - Guardian Purifier Pump

The Guardian water purifier pump uses an advanced hollow fiber filter to offer a reliable way to filter viruses, bacteria, protozoa, and sediment from backcountry water sources. 2.5L of purified water flows from the Guardian per minute of use without the need for batteries or waiting for a chemical process. Features Meets NSF protocol P248 testing standards Fast and easy filtration Self-cleans on every pump Cartridge replacement indicator Hollow fiber cartridge treats up to 10,000 liters Engineered to withstand heavy use, low temperatures, and the occasional drop Specifications Weight: 1 lb 1 oz Dimensions: 8.25" L x 4.5" H x 3" W Filter pore size: 0.02 microns Effective against bacteria, particulate, protozoa, viruses. Not effective against chemicals or toxins