Various ions, such as Ca, K, Na, Cl and S, exist in water in bonding states.
When this water is ionized, alkaline ions (like Cs+, K+, Na+ and Mg+) gather and water become drinkable alkaline ionized water in the Cathode (-) and acidic ions (like Cl- and S-) and water becomes acidic ionized water in anode (+) that is good for the skin.