Thanks for the response. We have NYC water which is really very good, good enough to filter and sell as bottled water which is actually done. I use no cleaner of any sort. The toilet doesn't need any. I have had a Toto Carrollton upstairs for about 7 years without a problem. Perhaps just a bad flapper this time. The Soiree does get more use than any other toilet in the house. But funny how it "fixes" itself.