Install Customer Supplied R.O System Drill 5/8” Hole on Quartz Counter Top for Dispenser Plumb in Water Lines and Filtration System Under Left Side of Cabinet Mount Bracket for Filters in Cabinet and Secure Excess Lines for Filters Hook Up Drain for R.O System, for Rejected Water from Filtration Does Not Include Additional Warranty on R.O System After arriving to the home, the homeowner made me aware of a R.O System they would like to have installed in their Kitchen. The home is newly constructed, approximately 3 years in age. The kitchen sink has an undermount sink basin, with quartz countrtops. I gave an estimate to perform the work, and after gaining approval, I began by drilling through the quartz. The quartz was 1-1/2” thick, I used a 5/8” diamond bit, and used water to keep the area cool. After drilling the hole. I tied into the cold side of the faucet, and ran the 1/4” water lines to the respective areas. I mounted the 3 phase R.O filter system under the left side of the sink.