Our onsen uses thermal water flowing directly from the spring source, which is very tender and appropriate for those with vulnerable skin as well as babies, the source thermal water is also known as ‘simple hot spring’. Since our thermal water also includes a high percentage of metasilicic acid, the moisturizing esthetic skin component, it is known as the soft thermal water *Thermal water is said to become esthetic skin support when metasilicic acid content is higher than 100 mg (accelerates skin metabolism, improves ceramide action, and since it also includes around 35.9% of silicon, this thermal water improves the skin and hair condition, because silicon is a required ingredient for skin and hair renewal and growth), making it correspondent to the ‘beautifying bath’. HANAYUUKA’s thermal water contains even 237.1 mg of metasilicic acid per 1 kilogram.