Katadyn Micropur MP1 is the latest addition to Katadyn's Ultralight Series. This little tablet does it all. Micropur MP1 is the only microbiological water purifier product of its kind. Micropur MP1 tablets release chlorine dioxide, the same substance used in municipal drinking water plants worldwide. So not only is the water safe to drink, it also tastes great. Tablets are individually sealed for longest shelf life (5 years). Each of the tablets treats 1 liter of water.