Filtering ?? OH- Reduced Water Remove heavy metal (alkaline water) (cathode) Ca2+ Na+ Tap Water Removal Chlorine ?? Electrode Ma2+ K+ Anti-bacterial ?? H+ Oxidized Water (acid water) (Anode) Cal - S2 Reduced (Alkaline) Water: By the process of electrolysis, the minerals in tap water, such as Calcium, Magnesium, K, Na, etc. will go to cathode.