If you drink tap water regularly, you are most likely intaking chlorine. Unfortunately, tap water comes with a little bit of chlorine which can lead to illnesses. Drinking water that contains chlorine can lead to a variety of cancers such as rectal, colon, bladder, and breast cancer. Chlorine can also come in vaporized form and can be inhaled into your lungs. Having a water filter cleans your water and the air in your home.