And it's not from using it... I noticed last week when I was hugging the toilet after a bout with the stomach flu that the water/bowl itself positively stinks. I clean the toilet a few times a week with clorox bowl cleaner and a brush, I make sure to scrub under the rim of the bowl, etc... the water/bowl itself sort of smells like raw sewage mixed with amonia. We are on Chicago city water, which we don't have a problem with (and never have) anywhere else in the house. Does anyone have any ideas as to what could be causing this smell?