Abstract: An automated system and method provides a user with a chemical treatment solution for a problem with the user's fluid system. The user, who may have an industrial or commercial water treatment problem, uses a structured data-entry process having a plurality of interfaces. With the interfaces, the user can specify the type of system they have, the service their system provides (e.g., heating, cooling, supply or waste water process), the heating or cooling load of their system, the quality of the water source, the evaporative or other losses expected, the throughput, the metallurgy of the piping and other equipment of their system, and the operating conditions of their system. After the data-entry process is complete, the automated system and method recommends a specific water treatment solution uniquely tailored to the needs of the user.