The UV-C ray disinfection sector is constantly growing, driven on the one hand by increasingly stringent regulations on drinking water and purified waste water and on the other by an ever-increasing interest in treatments that do not require the use of chemicals. Living organisms do not have adequate defense mechanisms against ultraviolet rays. The photochemical reaction deriving from exposure to UV-C light involves the breaking of the bonds within the DNA chain which prevent the microorganisms from reproducing, leading them to end their life cycle without giving rise to subsequent generations. Montagna proposes three families of disinfection systems: closed vessels, open channels, and air and surfaces disinfection systems