When water is referred to as 'hard' this simply means that it contains more minerals than ordinary water. These are especially the Calcium and magnesium.
It is a technique that serves the removal of the ions that cause the water to be hard, in most cases calcium and magnesium ions. The best way to soften water is to use a water softener unit and connect it directly to the water supply.
It is an important process, because the hardness of water in households and industries are reduced during this process. When water is hard, it can clog pipes and soap will dissolve in it less easily. Water softening can prevent these negative effects.
If properly maintained, water softener can last from 15 to 20 years.
If your water pressure is dropping significantly and your water softener is sounding like it is constantly running, then your water softener may not be in a great condition and needs maintenance.
Hard water contains minerals that absorb the skin's natural oils, breaking down the skin's natural barrier. Constant use of hard water will lead to dry skin. Once hard water is softened, the harmful minerals will not be able to damage your hair and skin.
If you have hard water the most common problem is your skin pores are packed with soap scum. The best way to fix that is to soften your water.