Open irrigation systems and greenhouse irrigation automation systems are used in open space with the purpose to find a solution to inject acid and manage two-way valve system and are able to return to the tank mix in case of the need. The systems receive the signal from sensors located in the tank and allow to cut off the flow when they reach the necessary limits. In such a system, instant and more precise dosing than usual is done. The front of the tank is organized as a mixture of water and homogenous fertilizer, so plant`s nutrient solution is obtained.