Replacement charcoal filters for the Farberware coffee maker may be purchased at Walmart.com, according to user reviews. The coffee maker is sold exclusively at Walmart, and the filters are sold under the model number 103743-F, as of 2015. The filters may also be used in certain GE coffee makers.
The purpose of running drinking water through a carbon filter is to remove impurities, such as chlorine, sediment and volatile organic compounds, that may be harmful and may give the water an undesirable taste, according to Wikipedia. The Farberware charcoal filters are made of 90 percent charcoal.
Charcoal is made of carbon, and the activated charcoal that is used in filters is treated with oxygen, according to HowStuffWorks. Together, the two substances absorb unwanted odors, flavors and colors from tap water, making these types of filters especially useful in coffee makers.
While activated charcoal filters may prevent certain substances from passing through, other substances, such as sodium and nitrates, are not attracted to charcoal. These substances build up over time, which makes the need to replace filters inevitable. These types of filters may also be used in products that protect the lungs from harmful substances in the air, such as air purifiers and respirator masks.