The book "Filtration for Oily Wastewater: Wettability of Filter Media" offers a comprehensive examination of the filtration process as an effective method for treating oily wastewater. It focuses on the importance of the wettability of filter media and its impact on the efficiency of oil removal. In recent years, research on the physicochemical properties of filter media has gained significance, particularly concerning the selection and design of efficient filter materials. The work analyzes various common granular filter media, including nut shells, anthracite, manganese sand, ceramic granules, quartz sand, and ceramic sand. Additionally, a laboratory-simulated small deep filtration process is presented to investigate the relationship between wettability and oil removal efficiency.