It is small and light, but brings a lot of power. Fast preparation of up to 2l/min is no problem with the Dual Piston technology. Optionally, 2l/min can be filtered in "Faster Flow" mode or 1l/min in "Longer Life" mode. This activates a ceramic pre-filter that extends the life of the fiberglass filter for more heavily contaminated water. The water passes through three stages of filtration to eliminate all harmful ingredients. Activated carbon reduces odors and chemicals, the ceramic pre-filter removes particles and suspended solids, and the glass filter retains bacteria and protozoa. The result: fresh, great-tasting water.