The A.O. Smith’s AO-FF Drinking Water Purifier filters water from your refrigerator/freezer. It reduces up to 99% of 77 harmful contaminants such as chlorine, chloramine, lead, mercury, BPA, PFOA/PFOS, sediment and cysts which causes to the reduction of turbidity and increase in water quality. The water goes through four filtration methods but nothing is added to your water during the filtration process. It is suitable for households with 3 people.