The process of water filtration isn’t new; it dates back to 4000 BC. This video discusses the importance of water filtration and the various processes used to filter water—focusing primarily on gravity filtration, including slow sand, rapid sand, high-rate, and monomedia filtration—and rapid sand filtration, which uses means of dual media, multimedia, or deep-bed monomedia. It also discusses the various elements of the filtration process, including coagulation, flocculation, and sedimentation.