A computer program for operating a computer to perform various steps. In one step, the program causes the computer to display to a user of the computer a first hierarchical level representative of one or more companies, where each company of the one or more companies has respective water treatment needs. In another step, and for each company of the one or more companies, the program causes the computer to display to the user of the computer a second first hierarchical level representative of one or more facilities for the respective company. In another step, and for each facility of each company of the one or more companies, the program causes the computer to display to the user of the computer a third hierarchical level representative of one or more water treatment systems for the respective facility.