This Waterdrop T4-A Alkaline pH+ Reverse Osmosis System provides two convenient water options through its dual-flow faucet: standard RO-filtered water and mineral-enhanced alkaline water. Its 10-stage filtration process, including an RO membrane, helps reduce PFOA, PFOS, chlorine, heavy metals, rust, colloids, and other unwanted substances, while the alkaline line adds beneficial minerals for a refreshing taste. With a 450 GPD flow rate and a 2:1 pure-to-drain ratio, the system delivers filtered water quickly while helping reduce wastewater. The compact tankless design saves valuable under-sink space and minimizes water storage. Smart indicator lights and buzzer alerts remind users when filters need replacement. The system is NSF/ANSI 372 certified, made with BPA-free materials, and requires an electrical connection and countertop drilling for faucet installation. | Waterdrop | | WD-T4-A Alkaline pH+ Reverse Osmosis Water Filter,extra RTCB Filter | White | Best Buy