Loaded with major ions — the essential minerals (Ca, Mg).
Buoyancy
Effortless float
LowHigh
Dense, salty water — you float without effort.
SodiumChloruresBrome
Shirotake Onsen (Shiromizukiso) is based in Hitoyoshi, Kumamoto Prefecture, Japan. Its sodium-chloride thermal water reaches 40°C. The venue features an indoor bath, an outdoor rotenburo and a sauna.
Insider tip — 'Shiromizukiso' (白水木荘 — white water tree inn) at Shirotake Onsen in Hitoyoshi. 'Shirotake' (白竹 — white bamboo) and 'shiromizu' (白水 — white water) both evoke the clean, clear character of Hitoyoshi's spring waters — sodium-chloride springs that emerge unusually clear and colourless despite their high mineral content. Hitoyoshi's springs have been prized since the Sagara clan ruled this domain for 700 years — one of Japan's longest-lasting feudal dynasties without interruption.