Blending the proven filtration of the micro-filter with the chlorine-based SweetH2O Purifier Solution, the MSR SweetH2O Purifier System provides safe, clean H2O worldwide. The 4-to-1 mechanical advantage pump lever services a micron filter that eliminates H2O borne bacteria and protozoa, such as giardia and cryptosporidia, with a worst case purifying solution backup.