NSF 53 certified to reduce Lead by 99.6%, Cyst by 99.99%, Benzene by 96.6%, Carbofuran by 98.4%, Endrin by 96.6%. NSF 42 certified to deliver better tasting water by reducing Chlorine, taste and odor. NSF 372 certified lead-free material. Enjoy fresh water by replacing your water filter every 6 months or 300 gallons, whichever comes first will vary based on water quality.