NSF 53 certified to reduce 99. 6% of Lead, 99. 99% of Cyst, 96. 6% of Benzene, 98. 4% of Carbofuran, 96. 6% of Endrin for safer water NSF 42 certified to reduce 97% of Chlorine, taste and odor for better tasting water NSF 372 certified lead-free material A Precise, leak-proof fit for your refrigerator Designed to provide 6 months or 200 gallons of cleaner water Simple design for easy replacement requiring no tools Uses , renewable coconut shells as the raw material for a better planet