Katadyn is a Swiss company that has long been recognized as one of the premier water filter companies in the world. Katadyn filters are even listed as one of the recognized brands on http://www.providentliving.org/.The Combi is one of Katadyn's best filters because of the amount of water that it can filter. It has a filtering capacity of up to 13,000 gallons. This is a top of the line ceramic filter that also features activated carbon to improve water taste and quality. Here is the technical information on the ceramic and activated carbon filtering capabilities:
Katadyn Ceramic filters have a micro porous structure with impregnated silver which delays the growth of bacteria. The pore size of Katadyn ceramic filters is 0.2 micron (0.0002 mm). Bacteria range in size from 0.2 to 5 micron and like protozoa (1 – 15 micron), are efficiently filtered out.
Activated Carbon is used for its ability to reduce harmful organic and inorganic substances in the water. It removes unpleasant tastes, odors, chlorine, pesticides (such as lindane, DDT) and trihalomethanes (THMs). These substances adhere to the large surface area of the activated carbon.
Katadyn has a wonderful video of their product that can be viewed at: