Abstract: A water treatment system having a self-cleaning filter assembly connected to a supply conduit for receiving an effluent and filtering solids from the effluent. The filtered effluent is passed through an ozone and oxidation assembly and into an ozonizing stage which includes subjecting the effluent to ultra-sonic waves and an electric current simultaneously for changing the condition and character of the effluent. The system includes a sterilizing assembly for decontaminating the ozonized effluent, with a chlorinator desirably chlorinating the effluent prior to discharge of the effluent from the system.