Katadyn Pocket Microfilter - A classic Filter. This heavy duty filter is ideal for long lasting, continuous use. The silver impregnated ceramic element is effective against bacteria and protozoa. The Katadyn Pocket is the only water filter with a 20 year warranty. Includes: Prefilter, bottle clip and carry bag. Filter element lasts 13,000 gallons50,000 liter filter lifeOutput - 1 liter per minuteWeight - 20 oz.0.2 micron ceramic depth filter - cleanableEliminates bacteria, protozoa, cysts, algae, spores, sediments and viruses in combination with particBPA Free