NOVELTY - A grease trap tank (2) with a lid (3) which divided into several treatment chambers installed with a submergible stirring pump (4), is new. A treating agent pump (11) is arranged in juxtaposition to tank, to supply treatment agent to the inflow of the waste water and discharge purified water to the reservoir (8). A controller regulates the operation time of pump, addition time of treatment agent and waste water amount.    USE - For stirring purification of waste water containing oils, fats ejected from kitchen, food processing industry such as restaurant.    ADVANTAGE - Prevents global environment pollution due to incineration process and hence improves decomposition of waste water. Avoids expensive maintenance of in-pipe cleaning.    DETAILED DESCRIPTION - A grease trap tank (2) with a lid (3) which divided into several treatment chambers installed with a submergible stirring pump (4), is new. A treating agent pump (11) is arranged in juxtaposition to tank, to supply treatment agent to the inflow of the waste water and discharge purified water to the reservoir (8). A controller regulates the operation time of pump, addition time of treatment agent and waste water amount. The waste water from drainage channels such as kitchen or food processing industry having fat and oil, is supplied sequentially to the grease trap tank. One or several stirring pumps with independent housing are installed in the tank. Each pump has bottom pump inlet (6) and top outlet (7). The treatment agent decomposes the waste water containing oils and fats to microfine molecule with surfactant having hydrophilicity and lipophilic properties, which also includes microorganisms, enzymes, etc. The controller sets the timer for regulating the operation time of stirring pump in a tank, addition time of treatment agent, size of grease trap and the inflow amount of waste water. The discharge pipe is provided to supply water from reservoir to pump side for repeated stirring of waste water during its treatment.    DESCRIPTION OF DRAWING(S) - The drawing shows the cross- sectional schematic view of a grease trap tank with stirring pump of stirring purifier. (Drawing contains non-English language text).    Grease trap tank (2)    Lid (3)    Stirring pump (4)    Pump inlet (6)    Outlet of pump (7)    Reservoir (8)    Treating agent pump (11).