Each PUR faucet filter is certified to reduce mercury and certain industrial pollutants, as well as reducing chlorine (taste and odor) and more.1 PUR faucet filters are certified to reduce 70 contaminants, including lead, mercury, and certain pesticides.1 Certified to reduce 10x more contaminants than Brita's leading pitcher filter.1 2 As the #1 selling brand in faucet filtration3, PUR has been developing innovative technologies for superior water filtration for over 30 years. Carbon, ion exchange 2 stages.