I live in a rural area, and I use well water. Ours has nitrates in it, which does not work for me since I have fish tanks. I searched for a company to install a reverse osmosis system for me, and I found Clearwater Systems Charlottesville, VA in the phone book. I figured I might as well get rid of everything else in the water that might be hazardous while I was at it. The installation man was very competent at his job, and the company was relatively easy to deal with and interact with. They were good about answering their phone calls, and also about answering the questions that I had. The system seems to be working fine, too!