CSL Water Quality is a manufacturer of water treatment products. It specializes in boilers, cooling towers, chilled and hot water loops, wastewater and potable water systems. Its services include carbon monoxide and carbon dioxide testing, temperature and relative humidity testing, airflow testing, mold and airborne bacteria investigation and analysis. It also offers HVAC-related inspections, custodial-related inspections and building envelope inspections. It carries TruTest and TruAire products and systems.