When we bought our first house in Yuma, we had never had experience with using/maintaining a water softener or reverse osmosis filter unit. We ended up calling out Culligans of Yuma to come out and give us some lessons on how to maintain the units. The man from Culligans was wonderful. He walked us through the maintenance program to make sure we knew what we were doing. We ended up using Culligans on a regular basis to replace our filters. The Culligan man was always very friendly and professional. I highly recommend their services.