The Katadyn Combi Microfilter in Black combines ceramic and carbon filtration technology. It features a silver impregnated 0.2 micron ceramic filter that will sieve out bacteria and protozoa. This element can be cleaned to prolong its life and will last for 13000 gallons. The additional activated carbon filter removes chemicals like chlorine and pesticides resulting in healthier, better tasting drinking water. This cartridge will last for 105 gallons. Both cartridges are replaceable. You can also connect the Combi to a water faucet if you're using it in basecamp, your cabin or your RV. It's the ideal water filtering system to have handy on long stays in areas where clean drinking water is not always readily available.