Sento Maedayu

Bunkyo, Tokyo, Japan

Location: Bunkyo, Tokyo, Japan
Water type: sodium chloride
Temperature: 41 °C
pH: 7.3

Water profile

Thermicity

Sedative

41 °C

LowHigh

Relaxing — deep, immediate muscle release.

Mineralisation

Restorative

LowHigh

Loaded with major ions — the essential minerals (Ca, Mg).

Buoyancy

Effortless float

LowHigh

Dense, salty water — you float without effort.

SodiumChloruresBrome

Sansuke (三助) is a term referring to the male working staff who provide specific services at the Sento in Japan. They were usually hired for both men and women to assist in bathing and provide massage services.

Insider tip — Sento Maedayu is a neighborhood public bath in central Tokyo that taps a deep urban onsen drawing sodium-chloride water from a Pleistocene marine layer far beneath the city. The dark amber water, rich in organic compounds, is the signature style known as kuroyu or black water that Tokyo onsens are famous for. The building retains classic sento design with a tall chimney, tiled murals, and an honest utilitarian atmosphere. Early evening is the prime local bathing hour when the neighborhood regulars gather.

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