Mt. Omine is 1,147 meters high, located between Kamaishi City and Tono City in Iwate Prefecture. It takes decades for rain or snowmelt pouring over this mountain to pass through layers of limestone, magnetite and granite. In the meantime, the water is filtered over and over.
We visited the water collection site, 600 meters down from the summit. The water is ultra soft with fine particles and less mineral content.
The pH is slightly alkaline, almost the same as tears. That is why it's easily absorbed and kind on the skin.