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Powerful, fast, and easy to use, Sawyer Select Water Filters and Purifiers remove virtually all contaminants found in fresh water while improving taste and odor -- all in about 10 seconds. Available in three models, the Select filtration and purification systems combine a proprietary foam membrane in a portable bottle with a 0.1 micron hollow fiber filter at the top — ensuring access to clean water while hiking in the backcountry, traveling internationally, at the office, or at home during emergencies.The Sawyer Select series models vary in level of water filtration and purification. All three include Sawyer's signature 0.1 absolute micron Micro Squeeze Filter, which removes 99.99999% of bacteria and 99.9999% of protozoa and cysts. Each bottle also features a dense, replaceable foam membrane that blends activated carbon and other proprietary ingredients to remove small contaminants that the 0.1 micron filter can't capture alone — including chemicals and pesticides.Choose the Sawyer Select model that's right for you:Select S1 Filter removes chemicals, pesticides, bacteria, protozoa, and cysts — great for hiking, travel, and outdoor adventures. John is hiking the Lone Star Trail in Texas and is worried about pesticides from agricultural run-off. He is taking the S1. Larry is a youth pastor taking a team to Fiji and is staying in a hotel. He wants to make sure his team is drinking safe water, so each person is carrying an S1.Select S2 Purifier removes 99.99% viruses plus chemicals, pesticides, bacteria, protozoa, and cysts — great for hiking or travel near farms and industrial areas around the world. Andrew is going on a paddle trip in Mexico to a region with a known Rotavirus outbreak. He is taking the S2. Jane is working at Dadaab refugee camp in Kenya and is worried about hepatitis E contamination so she is using the S2.Select S3 Purifier reduces heavy metals down to 0.5 parts per billion (up to