https://www.migros.ch/de/content/migmag-darf-man-wasser-zweimal-aufkochen?utm_source=mm-newsletter&utm_medium=e-mail&utm_campaign=mmd_11_2023&utm_content=darf-man-wasser-zweimal-aufkochen Funny, if you ask a bacterologist, he only looks at the chafers... but the fact that more limescale is deposited the more concentrated the "soup" becomes is beyond his focus. Every time you rinse the kettle, a few limescale lumps go down the sink without them going down the throat or requiring vinegar cleaner...