be used simultaneously depending on the application fig6 depicts the fig1 embodiment 100 in an unexploded format 500 from the same perspective as fig2 except that the embodiment of fig2 has been sectioned to reveal inner details of the apparatus the components of fig6 embodiment 600 correspond to the components of fig1 embodiment 100 filtrate flows from drum assembly 602 shown without screens through a multi vaned louver 621 which directs the flow at the bulbs of three ultraviolet modules 608 made up of elongated ultraviolet bulbs 620 baffle 622 further directs the flow of filtrate to the ultraviolet bulbs as does baffle 624 which effectively forces water through louver 621 vertical end baffling is provided at each end of each ultraviolet module these end baffles force water that is moving at the outer vertical surfaces of the apparatus directly onto the ultraviolet bulbs the combination of louver 621 baffle 622 baffle 624 and the end baffles maximize the efficiency of the process of disinfecting the water flow by assuring that as much of the filtrate as possible receives uv radiation from the ultraviolet bulbs in addition efficiency of irradiation is further enhanced by the turbulence created by louver 621 baffle 622 baffle 624 and the end.