A chemical dosing system uses pumps to automatically control the dosing process. In the case of wastewater treatment works, there are certain environmental regulations in place from the water regulator, so when sewage enters the works, the effluent has to be filtered, cleaned and processed.A dosing pump draws a measured amount of liquid into its chamber and injects the chemical into a tank or pipe that contains the fluid that is being dosed. It's powered by an electric motor or an air actuator and has a controller that turns the pump on and off and manages the flow rate