It was oolala (can't remember your new screen name- lolo?) who told me about soaking my shower head in vinegar overnight to remove the "calcaire" (mineral deposits). I did it when we first got here, then kind of forgot about it and just did it again this week. My water pressure is so much better! And my hair is shinier, but maybe I am just imagining that.
So, anyway, thanks. And if you live in a mineral-heavy water area, soak your showerhead in vinegar!