Its the best choice for overseas expeditions, rafting trips, base camp, or anywhere that requires an indestructible filter that can accommodate large groups up to 20 people. The hand-operated filter has a rock-solid build of nickel-plated brass and stainless steel. It uses a ceramic filter that eliminates bacteria, protozoa, cysts, algae, spores, sediments and viruses in combination with particles greater than 0.2 (0.0002mm) microns. These types of microorganisms cannot pass through the mini-pores of the filter because of the small, 0.0002mm pore size. Unlike disposable filters, the ceramic filters can be cleaned to extend its use. The included measuring gauge indicates when the filter should be changed. Includes a pre-filter and canvas carry bag. Manufacturers limited-lifetime warranty. Imported. Weight: 183.4 oz. Dimensions: 23 x 8. Capacity: 26,000 gallons. Output: 1-gallon per minute. Cancer and Reproductive Harm- www.P65Warnings.ca.gov. Type: Filters.