The PURAK Magnetic Limestone Protection PK. 74140-25 has a geometry that allows to triple the space of magnetic treatment and to minimize the distance between the magnets in order to increase the intensity of the field and induce an orientation of the molecular dipoles to change the physical configuration of the water. To obtain the alignment of polarity along the inner surface the magnetic Lime Protection PURAK is composed of special magnetic rings made with a mixture of magnetized rare earth metals embedded in a ceramic base, and sintered.