HOH is a leading water treatment chemical and service company, working to establish the new water technology standard at over 4,000 facilities across the United States. With manufacturing and laboratory facilities in Illinois; a manufacturing facility and warehouse in South Dakota; regional warehouses in Michigan and Wisconsin; and a sales office in and Texas; we're ready to serve you. We excel in the commercial, institutional and light industrial market (with a unique ability in HVAC new construction arena), and in industries such as health care, higher education, auto and food processing. In addition to providing water treatment chemical and service programs, our Pretreatment Division provides water treatment equipment solutions (such as softeners, reverse osmosis, ultra-filtration and electrolysis) - not only the equipment, but the installation and service as well. We are also a leader in water safety programs, working with customers to develop their site plans and providing Legionella testing, point-of-use filtration and potable water treatment programs.