MSR MiniWorks EX Water Purification System delivers the viral protection you'll appreciate while backpacking wilderness areas or if you travel developing countries. A ceramic and carbon element filters with up to 99.99% effectiveness against viruses, 99.9999% against protozoa and 99.9% against particulates. This ensures safe, taste-free water at one liter per minute. When viruses are a concern, add a chlorine-based iodine-free Aquatabs tablet for extra certainty. Filter can be cleaned repeatedly. Compact, easy-to-use MSR MiniWorks EX system meets United States EPA requirements for microbiological water purifiers. Weight: 1 lb. Made in USA.Manufacturer model #: 14007. Ceramic and carbon element filters water 99.99% effectiveness against viruses 99.9999% against protozoa 99.9% against particulates Safe, taste-free water at one liter per minute Filter can be cleaned repeatedly Compact and easy-to-use Meets United States EPA requirements for microbiological water purifiers