The Waterdrop G5P700A tankless reverse osmosis system features 8-stage filtration, a 0.0001 μm RO membrane and mineral enrichment. It delivers a fast 700 GPD flow, fills a 6 oz cup in 6 seconds and offers a 2:1 pure-to-drain ratio. Its compact design saves up to 70% of under-sink space and connects to refrigerators and ice makers. Countertop drilling is required. | Waterdrop | | G5P700A Alkaline Mineral pH+ Reverse Osmosis Water Filtration System, EXTRA RPFK Spin Down Sediment Filter | Black | Best Buy