The Eddy water descaler uses electromagnetic waves to reduce the effects of calcium and magnesium minerals in hard water, otherwise known as “limescale”. Eddy alters the form of the dissolved limescale crystals to a softer, less harsh and corrosive type which is much less likely to adhere to taps, basins, toilets, boilers and pipework. Most of the limescale is then flushed harmlessly away with your normal waste water.