Did you know that water can be classified as hard or soft? And no, water hardness and softness has nothing to do with its touch and feel. Before you conclude that hard water is just ice, know that this classification has a lot to do with chemistry, specifically the composition of water, depending on its source.
Basically, water in its purest from—like rain water is what we call soft water. It becomes ‘hard’ when different chemicals combine with it. Chemicals and minerals such as calcium and magnesium, as well as chalk and lime. Iron can also be present in some cases. In essence, hard water is simply water that has high mineral content.