武蔵野温泉
Tokyo
Chloride springBicarbonate spring
The water here
Chloride spring 塩化物泉
Salty water. The salt leaves a thin film on the skin, so you stay warm well after leaving the bath.
Bicarbonate spring 炭酸水素塩泉
Smooth, slightly slippery water. Often nicknamed bihada-no-yu, the water for beautiful skin.
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Japanese Wikipedia
Other towns in Tokyo