Dosatron Water Powered Doser - D25 Series - 11 GPMSimplify your nutrients by directly installing Dosatron Doser into the water line Installed on the water supply line, the Dosatron uses water pressure as the only power source. Thus activated, it takes up the required percentage dose of concentrate and then mixes it with the moving water. The solution produced is then propelled downstream. The dose of injected product is always proportional to the volume of water passing through the Dosatron,