Simplify your nutrient feeding regiment by installing Dosatron Water Powered Dosing systems directly into the water supply line, allowing for direct inline feeding or filling reservoir tanks. The Dosatron Dosers operate by using water pressure as the power source (no electricity needed) which activates the doser by taking up the required percentage of concentrate and mixing it with water inside the unit. The water pressure then forces the solution downstream allowing you to daisy-chain the dosers to integrate all of your nutrients and supplements into a complete streamlined feeding system. All of the D-40 Series dosers include a mounting bracket, suction hose, bypass, union, weighted strainer, and quick start guide.