PUR Plus Horizontal Faucet Mount Water Filtration System is a water filter for your sink, engineered to deliver superior water filtration directly from your water faucet. Have confidence in your drinking water with PUR's powerful 3-in-1 filtration technology that reduces 10x more chemical & physical substances than Brita's leading pitcher filter. As the #1 selling brand in faucet filtration, § PUR has been trusted for over 35 years because of its rigorous water filtration standards and certifications. PUR is the only faucet filter brand certified by WQA to reduce lead and NSF to reduce 70 chemical & physical substances, including chlorine, from your drinking water. In addition to having confidence in cleaner, better-tasting drinking water, PUR has also engineered its PUR Plus Faucet Mount Water Filtration System to be easy to use. No tools are necessary, simply thread the PUR Plus Faucet Mount Water Filtration system onto your faucet for cleaner water, on demand. Not compatible with pull-out faucets or those featuring internal aerators. Great as a kitchen sink water filter system, it is equipped with an on/off lever so you can switch from non-filtered to filtered water. A filter change light ensures you'll always know when it's time to replace your Genuine PUR Plus Faucet Mount Replacement Filter. Remember, compatible doesn't mean comparable. Only Genuine PUR Faucet Mount Replacement Filters are certified to work with the PUR Plus Horizontal Faucet Mount Water Filtration System. Engineered for superiority, PUR believes that everyone deserves clean, better-tasting drinking water. 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.