The formation of deposits around the plumbing joints in central heating systems is caused by very slow water leaks. The water evaporates leaving behind the minerals that are in the water. They will include the chemicals used in inhibitors.
Stopping the very slow leak will cure it. A water softener will not.
If you want to find out more, the best thing to do is to book a demonstration so that one of our representatives can answer all of your questions in more detail.