The biggest feature of Arima Onsen is that it has two types of hot springs called "Kin no Yu" and "Gin no Yu". Each has a different effect and the benefits to the body vary depending on which one you bathe in. "Kin no Yu" contains iron and salt, which have a blood circulation-promoting effect, making it effective for coldness, lower back pain, joint pain, and other conditions. In addition, the salt forms a thin film on the skin, enhancing moisturizing effect. Furthermore, Arima Onsen, which has a sterilizing effect, is effective for infectious skin diseases, chronic eczema, hives, and more. On the other hand, the effect of "Gin no Yu" is to promote increased blood flow through the expansion of capillaries. This makes it effective for hypertension, peripheral arterial occlusive disease, and functional arterial circulation disorders. Since "Kin no Yu" and "Gin no Yu" have different effects, try soaking in the hot spring with the type of spring quality that you want to benefit from!