I did not consider that it could be a water chemisty issue. I have only had my tub a few weeks, and this was a problem even when it was sitting on the showroom floor. (It was a year-old floor model when I purchased.) I assumed that it was an '05 problem fixed in '06, based on what i read here and what my dealer said. They went from one little tab to two on the jet face. I guess we'll see what happens as I replace jets. If my dealer had bad water, then I'm in trouble. :-/ There is no build up visible anywhere, but the little tabs break and bend.