The Scalewatcher 5 is a weatherproof heavy duty electronic water conditioner. The unit works by sending out a computerized modulated signal which agitates the Calcium and other minerals, causing them to come out of solution and become suspended. This action stops any further build-up of scale by preventing the molecules from adhering to themselves or any other surface. The water's capacity to dissolve minerals is also increased, therefore existing scale is dissolved back into the water and gradually removed. New scale will not form. No chemical changes to the water. Unlike water softeners nothing is added to the water and nothing is removed. Water remains chemically unchanged, retains the beneficial minerals and taste is highly improved. Low Energy consumption. Uses 10 watts of electricity per hour. Guaranteed to eliminate hard water problems and removed existing limescale or your money back.