CalGlow is a totally unique scale inhibitor that combines two scale inhibiting technologies into one. The first technology is the use of a magnetic bar to induce a single polarity into the water. This causes the calcium and magnesium (limescale) particles to take on the same polarity. The particles then repel each other, and as a result prevent the formation of hard limescale. The second technology is the use of zinc plates which create the same reaction as the magnet. Once water passes over the plates and the inner copper body of the unit, a single polarity is induced into the water supply. This then stops the formation of hard limescale. In addition, the zinc plates slowly release minute particles into the water supply which prevents corrosion by removing all the air in the system.