The water filter is NSF 401, 53 and 42 certified to reduce 99.6% of Lead, 99.99% of Cyst, 97% of Chlorine, taste and odor, 99.2% of BPA, 96.6% of Benzene, 98.4% of Carbofuran, 96.6% of Endrin, 96.6% of Estrone, 95.2% of Phenytoin, 94.4% of Ibuprofen, 96.2% of Naproxen, 97.2% of Nonyl phenol The air filter keeps your food's tastes and smells separated, making the air inside your refrigerator fresh To maximize contaminants reduction, replace your water filter every 200 gallons or 6 months and change your air filter every 6 months