SYLVIA Camping Travel Water Filter Micro-filtration System by Diercon Smaller pore size vs Competition  Compare to Katadyn pocket filter which has 0.2micron pore size, the Diercon KP02 has 0.1 micron pore size. Includes Diatomite Ceramic Filter, and an antibacterial GAC filter which can be used for up to 50,000 Liters of water before replacing filter. Tested by TUV SUD for reduction 99.9999% of bacteria, meets EPA purifier standards and NSF/ANSI 42/53 A small but reliable water filter that you want along to keep you healthy and hydrated. Delivers water free of bacteria and protozoa. An output of 1 liter/minute through a silver-impregnated ceramic filter. Comes with a 20-year warranty  providing you with confidence.