Katadyn Combi Plus Filter Long Lasting Camping Emergency Purification PremiumKatadyn Combi filter is an all around filter, suitable for extremely dirty water and small groups up to 3 people. Effective against microorganisms, reduces chemicals and improves the taste of the drinking water. 2 stage filter not only removes bacteria and protozoa but also chemicals and bad tastes from water Filter physically removes parasites, protozoa, and bacteria down to 0. 2 microns in size, including giardia, salmonella, cryptosporidia and