The final work is divided into two main groups, namely the chemical part that talks about water and its composition and the electro-mechanical part that talks about all the parts that control the water chlorination system. In order to be able to approach this topic to someone who is not so familiar, the most important items and facts that are the basis for understanding this topic and further work that is part of the topic "Management and Regulation" are listed. When creating a paper on the topic "Chlorination of water in the water supply system" one should be careful, and keep in mind that the paper should not miss the topic on which it is based, and that topic is management and regulation. When first reading and observing the text, there is a possibility that the topic will not be understood for this reason the topic is divided into several separate titles that are closely related to their area. In this way, at first glance, the complicated topic was divided into many smaller parts that are simpler and easier to understand. It is important to note that the paper contains some facts and items that are fixed and expert and should not be changed in their definition. For the reason of avoiding misunderstanding of the fact and / or preventing misinterpretation of the same. As the paper mentions water as a product for consumption, it is important to add a law that will say how this water can be treated and what procedure is needed in order for water to be consumed. The principle of work and / or some function that is in the work is treated on simple examples that have already been applied in practice or will be. As it is difficult at first glance to present an image of a working element and a similar topic, the paper contains images that will facilitate the idea of the topic, the description of the work and the principle of the work being processed.