Description The Katadyn Pocket is a ceramic hand pump water filter built for camping, backpacking, hiking, survival, and emergency preparedness. The lightweight 20 oz microfilter pumps 1 liter of clean water per minute and connects directly to most water bottles and hydration packs. Built to last a lifetime - the silver-impregnated ceramic cartridge filters up to 13,000 gallons, is field-cleanable with the included brush pad, and includes a built-in wear indicator that tells you exactly when cleaning is needed so performance never drops. Aircraft-grade aluminum and stainless steel construction withstands drops, extreme cold, and daily professional use - proven in expeditions and military operations worldwide and backed by Katadyn's 20-Year Guarantee.