To confidently and continuously enjoy cleaner better tasting drinking water remember to change your PUR Faucet Mount Water Filter (RF3375) every 3 months or after 100 gallons of use. As the #1 brand in faucet filtration ‡ the PUR Faucet Mount Replacement Water Filter reduces 10x more chemical & physical substances than Brita s leading pitcher filter* through its powerful 2-in-1 genuine PUR filtration technology. It has also been rigorously tested and certified by WQA and NSF as the only filter to reduce 70 chemical & physical substances including lead microplastics chlorine and mercury. § Be cautious of off-brand water filters. They are not tested nor certified to filter the same as Genuine PUR Faucet Mount Water Filters in PUR and Beautiful by PUR systems. Genuine PUR water filters are the only water filters certified to reduce chemical & physical substances when used with your PUR or Beautiful by PUR Faucet Mount System. At PUR we believe that everyone deserves cleaner better-tasting drinking water. That s why we ve been developing innovative superior water filtration technologies for over 35 years. Disclaimers: *Versus best-selling Brita® pitcher filter OB03. Brita® is a trademark of Brita LP. †Based on comparing a year’s worth of bottled water (16.9 oz) to a PUR system and 3 filters. ‡Based on Nielsen sales data for the 52 weeks ending 7/1/23. §Like other leading brands PUR does not filter microbes. As of 3/1/23 Brita® and ZeroWater® were not certified to filter microbes. Brita® is a trademark of Brita LP. ZeroWater® is a trademark of Zero Technologies LLC.