Little Plumber Electronic Water Softener treatment units are guaranteed to remove and prevent limescale and make your water feel softer. With the ever increasing cost of energy it is essential to have a really efficient plumbing system. When hard water becomes limescale it forms a thick layer of chalk on the heat exchangers in your water heating system which effectively acts as a thermal insulator. This STOPS the heat generator from heating efficiently so requiring more and more energy to heat the same amount of water.