E-Plus Electrode is a depleting material; We Provide 2 type of array. Array B And Array C. The depletion rate of Array B is up to 80 times. While the depletion rate of Array C is up to 150 times, the most durable type of array in the market. With putting together the Electrode and feet in the water, the Ion Spa ( Ion Cleanse Foot SPA) main device transmits the electricity to the electrodes, to stimulate chemical reaction amongst alloy, water and salt, and thus produce many ions until the body regulated to the equilibrium of Anion and Cation, or we call it as Yin Yang Balancing.