Most water treatment companies possess knowledge about the science and mechanics of water treatment and conditioning that the clerks at the retail outlets do not. They are well versed in the installation of the equipment, the salt and hardness setting that should be used, and the proper resin technology that your specific water may require. They have the necessary testing equipment and experience to make sure that you have the right size and type of units you need. Another reason to purchase from a professional water treatment company is the service they provide after the sale, such as warranties and a well supplied service truck with trained technicians.