Dostaron injectors release fertilizer or nutrients directly into your water supply line. The injector operates without electricity, using water pressure as the power source. Water pressure activates the injector, which takes up the required percentage of concentrate directly from a stock solution container. Inside the injector, the concentrate is then mixed with the water, and then forced downstream. The amount of concentrate will be directly proportional to the volume of water entering the injector, regardless of variations in flow or pressure that can occur in the main line. Comes with mounting bracket, suction hose with strainer and weight, plus  an operating manual.