Installed directly in the water supply line, the Dosatron operates without electricity ; it uses the flow of water as the power source. The water activates the Dosatron, which takes up the required percentage of concentrate and injects it into the water. Inside the Dosatron, the concentrate is mixed with the water, and the water pressure forces the solution downstream. Once adjusted, the dispenser requires no action or external control. The dose of concentrate will be directly proportional to the volume of water entering the Dosatron, regardless of variations in flow and pressure which may occur in the main line.