replying to Martin Brown, Chrisp wrote:
That's quite right. Hard water is not biologically harmful, and is probably
beneficial. Increasing the sodium ion concentration in the water (ie salt) is
harmful, though, especially if you have high blood pressure. If you fit an
ion-exchange water softener to avoid scale build up in heating systems,
washing machines etc, make sure you fit a hard water take off from the main
supply before it goes into the softener (a swan-neck spout next to the tap in
your kitchen sink is easiest), and use it for cooking and drinking. Descaling
your kettle from time to time is better than having a heart attack!

--
for full context, visit https://www.homeownershub.com/uk-diy...e-1173706-.htm