DESIGNATION OF ULTRAVIOLET STERILIZERS. Ultraviolet sterilizes are used in cases when pathogenic microorganisms are needed to be eradicated or prevented against growth. Water disinfection is widely used in the following spheres: -Drinking water treatment; -Process and domestic waste water treatment; -Medical drug preparation in pharmaceutics (in this case ultraviolet radiators are installed in sterile water closed circuits, inside reactors); -End drinking water abstraction points (where local sterilizers are installed).