Limefighter - Magnetic Scale Inhibitor.
The Limefighter is a magnetic water conditioner that uses the principles of magnetism to alter the characteristics of hard water. Once conditioned by the Limefighter, limescale simply passes through a domestic hot water system without sticking to heat exchange surfaces. The Limefighter has been manufactured by Liff for over 20 years. In that time 1/2 million units have been sold worldwide.
When used in a hard water area, the Limefighter extends the life of household hot water appliances such as shower units or hot water cylinders.