UV measurement is employed in water treatment through two primary methods. Firstly, it’s used to assess the transmittance of UV light, which is crucial for deciding the intensity of UV light needed for disinfecting water. Secondly, UV measurement helps in determining the absorption of UV light, indicating the presence of organic materials in the water. This measurement often serves as a surrogate for total organic carbon (TOC), dissolved organic carbon (DOC), and chemical oxygen demand (COD), and is typically utilized for managing coagulation processes in water treatment facilities.