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Recently, many people prefer doing a lower-body bathing for diet and health. Doing a lower-body bathing in the water of 40 degrees is most effective, but it cools after fixed hours, and you have to continuously turn on the hot water. It is a waste of water to turn on the hot water once again only for the cold water.
Like the principle of magma of a submarine volcano to circulate water and warm it, heat is generated on the bottom of the product, when it is put into the bathtub, and it keeps water warm, while water circulates through holes of the outside of it.
seoul national university of science & technology
Goyang-si, Gyeonggi-do, South Korea
Hyunjoo Lee Sunmi Hwang Jiwon Seok