the electric switch 102 the pump motor 66 drives the injection pump 64 drawing liquid from the tank interior through the first conduit 76 the pump 64 and the second conduit 78 to the manifold 82 to thoroughly mix the chemicals and the water contained in the tank the return conduit valve c is opened with the other valves closed this will cause the liquid pumped from the tank to be recirculated through the manifold 82 and the return conduit 86 and then through the distribution conduit 88 and the pair of nozzles 90 the liquid output from the mixing nozzles 90 is directed against the gussets 48 in the tank interior creating turbulence in the liquid contained in the tank and thoroughly mixing the water and chemicals with the liquid thoroughly mixed in the tank interior it is next injected into the well to be rehabilitated to perform the injection function of the apparatus the manual valve d on the output conduit 92 is opened with all other valves being closed this causes the contents of the tank to be pumped through the output conduit 92 and the length of hose connecting it with the well not shown into the well if surging of the well is required the liquid which has been injected.