Our water was 21 grains hard, did not know how bad it was. After a few days letting the water in our hot water tank to exchange with good the difference was no less than remarkable! the RO for the drinking water is fantastic and will pay for it self with no more bottled water, EVER! The installation was quick and professional. We are very pleased with our Anderson water system. Thanks to Tom for his quick wit and over all great personality. It was nice to meet him, and better for us in the process. Thanks again! Lee and Patti Cross