Among the Katadyn water filters, the Katadyn Combi Plus is our overall pick. The Combi Plus water filter is comparable to the Katadyn Pocket filter yet it has an activated carbon stage in addition to the 0.2 micron ceramic element and its pump rate is a bit faster (1.2 L per min vs 1 L per min for the Pocket). The carbon removes chemicals such as chlorine as well as bitter tastes and odors. The feature of the Katadyn Combi Plus Water Filter which we really like, however, is the sink adapter which allows you to use your home water pressure to cycle the water through! Like the Pocket filter, the Combi water filter's ceramic element treats an amazing 13,000 gallons (if you choose to use the carbon granules, they should be replaced every 60 gallons - carbon stage can be removed when not needed to preserve its life). The Combi water filter plus is constructed of an extremely durable polymer and has a stainless steel pump mechanism. Includes 2 packets of activated carbon granulate and comes with a zip up carry bag. Like all Katadyn water filters, the Combi Plus will remove all giardia, fungi, parasites, cholera, typhoid, cryptosporidia, salmonella and other harmful bacteria, parasites, and germs.One year warranty.