Abstract: An automatic dispensing system dispenses chemical directly into a toilet bowl after the toilet bowl is flushed and includes a chemical dispenser and a hydraulic actuator. The chemical dispenser includes a pumping unit attached to a storage unit for storing a chemical cleaning and/or disinfecting solution. The chemical dispenser is attached to the hydraulic actuator, which is in turn attached to the overflow pipe in the tank of the toilet. The hydraulic actuator is also connected to a toilet bowl refill hose. During the flushing process, pressurized water controlled by a water level control unit is used to refill the toilet tank. Some of this water is shunted to the hydraulic actuator assembly. In response to the flow of pressurized water, the hydraulic actuator actuates the pumping unit to measure out a predetermined amount of chemical. When the toilet tank is refilled, the flow of pressurized water is stopped.