[Authoritative Certifications] Dedicated to providing pure and healthy drinking water, Waterdrop, a world-famous water purification brand, has been trusted by over 6 million American families. Waterdrop's high-quality replacement filters, from every component to the whole filter, have been certified by NSF and IAPMO against NSF/ANSI 401, 53, 42 and 372 standards for effective reduction of 35 substances, ensuring high-quality drinking water. [Comprehensive Certifications] this filter has been strictly certified against NSF/ANSI 401 for reduction of 99.2% of bisphenol A, phenytoin, estrone, ibuprofen and naproxen and against NSF/ANSI 53 for reduction of 99.6% of lead, 96.6% of benzene and 92.3% of mercury, it is certified by IAPMO for reduction of 20 harmful substances like 99.59% of ethylbenzene, over 99% of trimethoprim, 2,4 D, Lindane, MTBE and atrazine. Furthermore, it can reduce PFOA and PFOS according to testing. [Deep filtration] Waterdrop's refrigerator filters significantly reduce the levels of many different harmful substances in your water, including a 95.3% reduction in PFOA and PFOS tested by the third-party laboratory. Moreover, the filter additionally allows through many of the beneficial minerals in water that are essential for health. Size: lg.