a chemical source tank having a discharge and an injection fluid stored in the chemical source tank;

a dosing tank selectively in fluid communication with the discharge of the chemical source tank;

a fluid level detector operatively coupled to the dosing tank to determine a fluid level of the dosing tank;

a injection pump having an intake in fluid communication with the dosing tank and a discharge operatively coupled to a fluid system to receive the injection fluid; and

a controller, the controller operatively connected to the fluid level detector and the injection pump, wherein the controller uses a change in the fluid level of the dosing tank to calculate an actual dose rate of the injection fluid to the fluid system and controls a speed/duty cycle of the injection pump such that the actual dose rate approximates a target dose rate.