Limescale is the deposit left behind by hard water, it is made up of calcium and magnesium compounds. It causes scaling of heater elements in kettles, dishwashers and washing machines, as well as scaling in your pipes and boiler. It is likely you can see limescale on your kitchen surfaces, taps and shower. Softened water eliminates limescale, which reduces cleaning time.Your appliances and boiler will work more efficiently and last longer.