MSR Sweetwater Purifier System Iodine-free Inactivates viruses without bad-tasting iodine. Easy to Use Lever-action pump handle has a 4-to-1 mechanical advantage and dual pump action, so you don't have to work as hard. Dependable Inactivates 99.99% of waterborne viruses; eliminates over 99.9999% of all waterborne bacteria and 99.9% of common protozoan parasites, such as giardia and cryptosporidia, as well as particulates, bad tastes, and odors. Lifetime warranty