The drill is a tool with a rotating drill bit. It is used for drilling holes in various materials. Drills are commonly used in woodworking and metalworking. The drill bit is gripped by a chuck at one end of the drill, and is pressed against the target material and rotated. The tip of the drill bit does the work of cutting into the target material, slicing off thin shavings or grinding off small particles.
Drinking water plants are facilities where water is treated to make it portable. This process involves several phases such as catchment, mixing of coagulant & reactive substances, decanting & separation of sands, flocculation sedimentation, filtration, activated charcoal or chlorine. Drinking water plants are periodically clean the filters to remove particles that accumulate.