Special Low Price! - Katadyn of Switzerland has been producing high quality portable water systems since 1928. Their history has been one of innovation and durability. Katadyn products are used by militaries, health organizations and outdoor adventurers world-wide. No other water system provides higher quality or longer lasting performance. Katadyn water filters are considered the best in the world. The Combi Filter has both a 0.2 micron ceramic and activated carbon element; you can use one or both filter elements. This two stage filter system removes all bacteria and protozoa (including Giardia and Crypto) plus it removes chemicals such as iodine, chlorine and potential health hazards such as pesticides and insecticides.