A type of positive displacement pump used to transport fluids and solid materials. It consists of a helical screw that revolves within a cylinder transporting the materials along the axis of the screw. The Archimedes’ screw pump is the simplest form of screw pump. More complex designs consist of multi-axis screws and the use of similarly shaped pumping casings (stator) trapping portions of the materials in cavities and carried along the pump. These are used for high-flow applications and noted for their suitability for handling viscous fluids, slurries, and shear-sensitive fluids. The Mono pump is a well-known type of screw pump. Screw pumps are widely used in the water treatment, food, paper, chemical, petrochemical, and mineral processing industries.