Sure I have tips. You need to disassemble the unit and pull the cartridge out. Check the interior of the showerbody for foreign particles. Check the rubber gaskets, o-rings and such for slices, gouges or splits that would allow water to pass the seals.The only thing I can tell you is that we built this house new in Dec 2002. We dont have a sediment filter. Im not sure if it is ceramic or not.
I did find the product installation guide online here http://www.us.kohler.com/onlinecatalog/pdf/113280_2.pdf
Im going to read through it and see if anything makes sense to me. Let me know if you have any tips.