AO Smith High-Efficiency Reverse Osmosis with SmartFlow™ Technology - Under Sink

Clean, Healthy Tap Water - Reduce up to 99% of 90 contaminants including fluoride, chlorine, chloramine, lead, arsenic, pesticides, PFOA/PFOS, cysts, microplastics, and more from water in your house.
Advanced Filtration - Under counter reverse osmosis filter system is indepently tested to NSF standards 42, 53, 58, and 401.
Dedicated Faucet - Keep water in your home's kitchen flowing with a chrome air gap faucet that prevents backflow into your filtration system by draining the water out of the air gap hole on the side of the faucet. Make sure the drain line is short, direct, and unobstructed.
Easy Filter Replacements - Simply twist out the used cartridge and replace with an AO Smith replacement filter for continued contaminant removal. Use only certified, genuine AO Smith replacements.
Includes first set of filters, RO tank, faucet, and all parts required for under countertop installation. Use Genuine replacements AOS-HERO-S1S3 (B0CCQ9TKMM) and AOS-HERO-S2 (B0CCQCNDLK)