this post was submitted on 25 Mar 2026
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It might be lime or calcium. The German word is Kalk, but it's basically the hard water, as you say. Yes, we were doing exactly that (the water is very hard here), and tried to remove the aerator in order to clean that too, which we hadn't done before, and that's how it all broke.
I've now made progress in breaking off another piece, but we're getting closer to just calling a plumber.