■Polar Magnetic Water Treatment Device, Polar International, Norway This device is connected to piping and contains a powerful permanent magnetic field with an effective magnetic force of over 6000 Gauss. It generates a weak electric current through the magnetic field and water flow, primarily for rust prevention, scale prevention, and slime suppression. ■Hydroflow Electromagnetic Water Treatment Device, Hydropath, UK This electromagnetic water treatment device forcibly creates an electromagnetic field within the pipe to perform scale prevention, rust prevention, and slime suppression.