KATADYN POCKET MICROFILTERThe Katadyn Pocket is the most rugged, longest lasting water filter :available. Its aluminum pump construction and durable ceramic filter :provide reliable performance, even in the most challenging conditions. :The Pocket is the only portable water filter with a lifetime warranty.Simply clean the included ceramic filter – it never needs to be replaced. Filter’s silver-impregnated ceramic element is effective against bacteria and protozoa.Filters all microorganisms larger than 0.2 microns to produce clear, drinkable water.Round pump handle for easy pumping. Outlet hose attaches to containers with clip.