coli, to test the performance of their Guardian filter. coli bacteria, but also a virus that attacks E. I visited the MSR facility where they showed me the lab where they not only grow E. All of them engage in rigorous testing, using EPA or NSF standards, both in their own facilities and through third parties, like BCS Laboratories out of Florida. Laura Lancaster How I Tested Backpacking Water Filtersīefore I even began testing, I interviewed the folks at MSR, LifeStraw, and Katadyn about how they guarantee that their filters are indeed removing bacteria and protozoa (and in the case of a few of them, viruses). So for Outdoor Life’s test of the best backpacking water filters, we decided to see which models from the top brands-including MSR, Lifestraw, Katadyn, Grayl, Platypus, and RapidPure-could handle the gnarliest water conditions backpackers can expect to find: stagnant water with high levels of bacterial contamination, the dark-tea tannin-filled water of a wetland, and silt-filled glacial runoff. Chances are, if you’ve spent enough time in the backcountry, you don’t have to imagine this scenario: It’s happened to you. Or the nozzle jams, barely a drop coming out no matter how much you squeeze. But when you go to pump, the pressure goes slack. You sit down, pull out your bladder and your pump, and drop the intake tube into the water. Imagine this: you’re in the backcountry, nearly out of liquids on a scorcher of a day, when you hit the first water source you’ve seen for hours.
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