Abstract: A water purification device which can process contaminated water, and upgrade it to a potable quality or other secondary useful purposes such as irrigation, shower or laundry and general water. This is achieved without the use of chemicals or membranes. The device consists of a geometrical configuration of riser and connecting tubes for contacting ozone and ultraviolet (UV) light with said contaminated water in order to provide an advance oxidation environment, resulting in disinfection, a reduction in biological activity, chemical oxygen demand, organic species and other water-borne contaminants such as fungi, molds algae, bacteria, viruses, protozoa, oils, fats, tastes and odours. The geometrical configuration of contacting the ozone, UV and water, combined with an ozone injection system that results in optimum disinfection of the water.