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With the Exstream® XR Water Bottle you just scoop or fill up your bottle with any fresh water source available. The ViruStat® water purification cartridge removes over 99.9 percent of waterborne cysts and protozoa, like Giardia and Cryptosporidium, 99.9999 percent of waterborne bacteria, and 99.99 percent of waterborne viruses. It’s great to take along for international travel, backcountry hiking and camping, paddle sports, and fishing trips.