My shower diverter is not transferring all of the water to the showerhead. Half of the water flows out of the tub faucet and the other half flows out of the showerhead. I have a three knob setup which contains a knob for each of the following: hot, cold, and diverter. I took the diverter valve to the hardware store and purchased a diverter that matched my existing diverter valve. I installed the new diverter valve which did not resolve the problem. Because the problem continued I went back to the hardware store. The hardware store clerk stated I must have purchased a bad diverter and to exchange it for another one which I did. Unfortunately, I continue to have the same problem with second new diverter valve. I removed the showerhead to verify whether the showerhead was clogged. When I turned on the water and turned the diverter to send the water through the pipe to where the showerhead would normally be installed, half of the water was dispensed out the faucet and the other half ran out the showerhead pipe. Any help you can provide is greatly appreciated.