Capresso 4440.90 3-pack Charcoal Water Filters

Since it pops up on amazon.com with the Brewstation, you might believe these filters fit the coffeemaker. They don't, so don't bother to buy them. Why they get associated on the website is a mystery.

Beginning with the Coffee Team Plus, Capresso introduced the concept of a water filter in the water tank of their automatic coffee makers. If you use tap water, the filter is a wonderful idea. It removes impurities and chlorine before the water is heated. Clean water and a clean coffee maker = great coffee.
The manufacturer's recommendation is to change filters every 6 weeks or 60 pots of coffee. I usually change them every two months, or so. I imagine the effectiveness of the filter may depend on the quality of the water you use. I haven't had a problem yet.
Usage tip: Each filter is individually wrapped in plastic to keep it fresh until opened. When you open a filter, first soak it in cold water for about 15 minutes. Then rinse it under running water for another minute or two until the water dripping from the filter is clear. If you still see black particles dripping from the filter, run a pot of water through the coffee maker, with the new filter inserted, without coffee beans and discard the water afterward, or use the water for plants (when it is cooled, of course.)