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With distilled water there is no limescale build up ;)
Wonder if you could make a coffee for hard water as they have done with teas.
You are right about the bottle water test, same coffee and differing tastes. Also how differing people prefer differing tastes.
lynx-
There are some things you can do when roasting for different waters, but they revolve around different mineral mixes at lower levels than tap.
You've just got to brew round the issue of bad water, use lighter roasts, brew colder etc....
No scale is fine, but I'd rather descale my machine more often and have better tasting coffee, nil minerals tastes Crap.
Matisse
Distilled water is actually pretty awful for coffee, the water itself is not very good at extracting flavour.
also the idea that you can saturate the water with too many minerals and therefore not extract flavour is a fallacy, balance is the key.
The bottled water test is fun, it's amazing how much difference it can make.