On 30/11/16 22:09, Bert Coules wrote:
I thought it was only artificially softened water that some consider
unhealthy.

The theory is that an excess of sodium ions (as opposed to calcium ones)
in artificially softened water is as had as eating a packet of crisps
every hour, although the amount of sodium in a pint of softened water is
about the same as in one crisp, never mind the whole packet.

i.e. there are three sorts of water:
Naturally soft = no carbonates.
Hard = calcium carbonates.
Softened = sodium carbonates.

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