It is the water with pH 9-10 obtained from drinking waters by the electrolytic reaction at the cathode of the alkaline ionized water apparatus (water electrolyzer for home-use).  Compared to tap water, alkaline ionized water has a higher content of hydroxide ion (OH-) and cations such as calcium, magnesium, etc. At the same time, hydrogen gas (H2) is also produced as nano-sized bubbles.