 Bull Hassocks pumping station was upgraded in 1892.Two centrifugal pumps were driven by steam engines, and when both were running, the station could discharge 300 tons per minute (440 Megalitres per day (Mld)) into the South Engine Drain.Diesel engines gave way to electric pumps at Dirtness in 1928, when they were replaced by a Gwynnes Limited pump driven by an electric motor.