‘Hard’ water contains more minerals than ‘soft’ water. It leads to limescale build-up in appliances, and you need to use more detergent when washing things.
- Hard Vs Soft Water Explained @ Free Drinking Water
Excerpt: Hard water is to blame for dingy looking clothes, dishes with spots and residue, and bathtubs with lots of film and soap scum. Even hair washed in hard water may feel sticky and look dull. Hard water can take a toll on household appliances as well and use up more energy. The elements of hard water are to blame for all of these negative factors, as soap is less effective due to its reaction to the magnesium and calcium. The lather is not as rich and bubbly.