Futamata Radium Onsen in Hokkaido is a colorless and transparent hot spring water when it first wells up. However, unlike other hot springs, the components of this hot spring are highly concentrated, and over time, these components precipitate and accumulate, forming "yunohana" (mineral deposits). "Dissolved Concentrated Water" contains dozens of times more "yunohana" dissolved in it than regular water. When you add this dissolved solution to your bath, you can expect the same effects as bathing in a hot spring due to the concentrated components. Main body size: 30cm x 30cm x 30cm Yunohana/Dissolved Concentrated Water: Weight approx. 23kg (labeled as 20L, but contains approximately 21L or more) Please refrain from discounts due to high shipping and container costs. How to use: ① Add 0.3 to 1 liter of "Yunohana Dissolved Concentrated Water" to your household bath as desired, and enjoy the feeling of a hot spring at home. The quality does not change even with long-term storage. ② The "yunohana" is completely dissolved by the dissolving and concentrating device, so it is almost transparent and does not stain the bathtub. ③ It has no effect on bathtubs, reheating boilers, etc. ④ When immersing minerals in a bathtub circulation system or directly in the bathtub, regular cleaning is required, which poses problems in terms of maintenance and hygiene. However, the dissolved concentrated water only needs to be added to the bathtub, so there is no generation of bacteria. ⑤ It is harmless to the human body, but do not use it for drinking. [Introduction to Futamata Radium Onsen (Hokkaido)] Among the hot springs in Japan that "publicly claim" to be radium hot springs, Futamata Onsen (Hokkaido), Tamagawa Onsen (Akita Prefecture), Arima Onsen (Hyogo Prefecture), Misasa Onsen (Tottori Prefecture), and Masutomi Onsen (Yamanashi Prefecture) are well-known and popular among therapeutic bathers.