The present invention relates to an integral system for treating the water for cooling towers and other processes such as reverse osmosis rejection, regeneration of the anionic units of demineralization systems, aircraft blue water and wastewater, in which it is desired to reduce and/or eliminate contaminants such as silica, total, of calcium and magnesium hardness, suspended solids, organic matter and microorganisms, heavy metals, detergents or arsenic, for obtaining a water quality that enables it to be reused in different industrial processes, generating savings in terms of water and chemicals. The system is characterized in that the water to be treated passes through an electrochemical cell with plates of aluminum, iron or some other metal, and, when an electric current is applied at an amperage that allows an optimal current density to yield the aluminum required to form a hydroxide of aluminum, iron or some other metal, which, when reacting with the contaminants present in the water to be treated, forms an iodine that is later separated out from the water, enabling the treated water to be reused by this system, by integrating the processes of filtration and ozonation it enables better water quality to be obtained for reuse in cooling towers, industrial processes, general services, irrigation of green areas or any other use.The technological innovation in the present invention is that it totally eliminates the silica present in industrial waters, allowing reuse of this water in different processes owing to the quality obtained. In addition to reducing the calcium and magnesium hardness salt concentration, preventing the formation of encrustations and, in cooling-tower systems, making it possible to increase concentration cycles, thereby generating savings of water and chemicals, it reduces microbiological proliferation, which will enable industry in general to replace conventional industrial water-treatment programs with this new technological alternative.The advantages and benefits of the present invention are that it allows reuse and recycling of 100% of the water that has to be discarded in cooling towers, reverse osmosis rejection, regeneration of anionic units of demineralization systems and wastewater from industry, generating financial savings by allowing reuse of the water that is currently necessary to discard, thereby reducing the quantity of required chemicals essential for cooling towers and wastewater, reducing the impact on the environment caused by water being discarded with contaminants and chemicals content that makes it impossible for it to be reused. Furthermore, it allows the elimination of the contaminants present in the water from wells that contain contaminants such as arsenic, cyanide, iron, manganese and microorganisms, enabling the water to be used for drinking.