So far, we have only used Clearwater Systems Charlottesville, VA to come out to a home to which we are planning to move, to see whether or not a Reverse Osmosis filter can be installed under the sink. Due to the physical characteristics of the counter, they could not install that system. They also called their supervisor to come out and look at the situation, with the same results. They were extraordinarily professional people, and very nice and amiable. The house does come with a water softener system, and as we get closer to our move-in date, we hope to be calling them out for that system.