Sewage treatment is a complex and essential process designed to remove contaminants from wastewater to protect public health and the environment. Among the various stages of treatment, the use of filters, screens, and sieves plays a crucial role in the initial removal of solid materials. This article explores in detail which step of sewage treatment employs these devices, their types, functions, and importance within the overall treatment process. Additionally, we will explore advanced technologies, maintenance considerations, and how screening fits into the broader context of wastewater management.