The K5 is our most advanced reverse osmosis system ever. Certified to remove more contaminants than any other system, it can produce more than 40 gallons of water a day—nearly three times the industry average. And thanks to FlexFiltration, its multistage filtering system is fully customizable and expandable to fit your water’s specific filtration needs should they ever change. The K5 Drinking Water Station is protected by a 10 year warranty on parts, including a 10 year warranty on the reverse osmosis membrane, when a Kinetico Water Softener is installed before the K5. The K5 Drinking Water Station carries a 10 year warranty on parts and a 4 year warranty on the reverse osmosis membrane if a Kinetico Water Softener is NOT installed before the K5.