Description of Katadyn Pocket Filter Replacement Element A robust and extremely reliable filter used worldwide not only by hardcore hikers, but by government, armed forces and humanitarian relief organizations as well. Constructed of extemely strong, durable materials such as polypropylene lined aluminum and ceramic. Keep your filter running at the capacity it was made to, replace the filter when necessary. Features: Filtration Element - Ceramic Protects Against - Bacteria, Protozoa, Cysts Flowrate - 1 quart per minute Filter Capacity - up to 13,000 gallons Weight - 21 oz. Dimensions - 10" X 2" Warranty - Lifetime Materials - Constructed of extremely strong, durable materials such as aluminum, polypropylene, and ceramic.