We live in Maine - and we have soft water. Soft and acidic (and that means disaster for our old copper pipes)....so much so we had to take out all our copper and replace them. Our boiler had to be replaced as well....and so I decided I needed to know more about the problem.
Then i found out that most of the USA (and Australia from where I come from...and where I am writing this) has the opposite problem - HARD water.
So i wrote down my notes on what these are ...in the hope others will benefit from learning a little of the science.