NSF 401 CERTIFIED: Reduces 99.2% of BPA, 96.6% of Estrone, 95.2% of Phenytoin, 94.4% of Ibuprofen, 96.2% of Naproxen, 97.2% of Nonyl phenol, giving you top-quality water NSF 53 CERTIFIED: Reduces 99.6% of Lead, 99.99% of Cyst, 96.6% of Benzene, 98.4% of Carbofuran, 96.6% of Endrin, delivering superior grade of filtered water NSF 42 CERTIFIED: Reduces 97% of Chlorine, taste and odor for fresh water that tastes great and refreshing