[altusbrown]

If you really want to avoid getting anything in your water - even essential vitamins and minerals - you can always distill your water. It’s worse for you though, much worse. That ‘chalk’ in your carafe is just small amounts of minerals you need anyway that come out of solution.

Bottled water has it too.

If they build up to the point it’s bothering you, a little vinegar will dissolve them right out.