For those of us having a quiet tier 4 christmas we don't want it ruined by the sound of minerals from our tap water.
Something that I've not found to be an issue so far.
My tongue was firmly in my cheek :)
In fairness the concern about leaving minerals from tap water on 'clean' records is probably more of an issue in some hard water areas, the kind of places where you can see the solid content in a glass of water for example.
@Airhead started
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Something that I've not found to be an issue so far.