The Waterdrop tankless reverse osmosis system features NSF/ANSI 42, 58 and 372 certifications, 11-stage filtration and alkaline mineralization. It delivers up to 1600 GPD, fills a 6 oz cup in 2 seconds and offers a 3:1 pure-to-drain ratio. The digital faucet displays real-time TDS and filter life. The mineral filter may slightly increase TDS. | Waterdrop | | X16-BAQ Alkaline Mineral Reverse Osmosis Water Filter, Bronze Faucet, EXTRA 2 F2 Filters | Best Buy