I have the common drip from the shower head. I have a Kohler Faucet set - 3 years old, Shower only - single handle. I am guessing my hard water does not help matters. I have cleaned the head (lots of minerals), replaced the head washers – still have my drip.

It's a Kohler K-304-KS value. My thought is that the minerals have had their way with the washer(s) in this unit. I don't want to rebuild this thing. Can you tell me how far back I need to go? Diverter (PN 89773) Cap (PN 77759), or Pressure Bal. Unit (PN 500520)?

Thanks in advance!