Solenoid dosing pump is a form of displacement pump that uses a diaphragm and solenoid assembly to discharge fluid into a discharge line. The solenoid “actuator” consists of a solenoid and spring assembly that is activated/deactivated by a series of electrical pulses. When the solenoid is activated, the solenoid pushes against the diaphragm, displacing the fluid. When the solenoid is deactivated, the spring mechanism returns the diaphragm, allowing more fluid to enter the chamber from the suction line in preparation for delivery.