Dosatron liquid dosage pumps for vitamins, medicaments, etc. operate by water pressure without electricity. Installed directly in the water supply line, the Dosatron is powered by the water flow. The water activates the Dosatron, which takes up the required percentage of concentrate directly from the container and injects it into the water. In the Dosatron the concentrate is mixed with the water, and the water pressure forces the solution further. The dosage of concentrate is directly proportional to the volume of water entering the Dosatron, regardless of variations in flow or pressure, which may occur in the main line.