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Yup - my lesson learned is to always throw a few purification tablets in a pocket of your pack, even if you're not anticipating being out very long. They weigh almost nothing and can save your butt if you run out of water on a longer-than-anticipated day hike or if your filtration system breaks on an overnight trip! I was hiking a 14er with a friend when our steripen's batteries died. We were borrowing it and had mistakenly brought the wrong batteries (we had AAA but it took AAAA). We had to drink unfiltered water for the rest of that trip. Luckily we were high in the mountains and the water was incredibly clean, but we all would have felt much better if we'd thrown in a few purifcation tablets.