Hachi Ban Yu Shimmei Taki No Yu

八番湯 神明滝の湯はちばんゆ しんめいたきのゆ

Public Bathhouse

Bathing & Water

Outdoor BathNo

Open-air outdoor bath

Indoor BathYes

Enclosed indoor bathing area

SaunaNo

Dry heat sauna room

Cold BathNo

Cold water plunge bath, typically used after sauna

OnsenYes

Uses natural hot spring water

Capabilities

Private BathNo

Private bath available for day-use visitors or hotel guests to reserve

Room OnsenNo

Private onsen bath in guest rooms, for overnight guests only

Mixed BathingNo

Shared bathing area for all genders

神明滝の湯

Shinmei-taki no Yu

Operated by · 渋大湯組

Mixed source

Sampled at bath inlet
Sulfate
+ Chloride
Classification

Sodium-Calcium Sulfate-Chloride spring

A hot (58.7 °C) sulfate-chloride spring led by sodium and calcium, neutral in pH and moderately mineralized at 1,218 mg/kg — the kind of water with real body to it. Metasilicic acid runs high at 148.7 mg/kg, leaving the thin silica film that makes skin feel noticeably smoother afterwards. Almost colorless and clear at the bath inlet, with a metallic iron edge and a faint salty note on the lips.

pH
6.00
Neutral
Source temperature
58.7°C
Hot
Tonicity
1.22g/kg
Hypotonic
Flow rate
10L/min
Low
Free CO₂
16mg/kg
Low
Color
almost colorless and clear
Taste
has a metallic iron taste and a faint saltiness
Highlights
  • High silica

Analyzed Nov 24, 2015·一般社団法人 上田薬剤師会 検査センター·Cert no. 中27-21(No.2051)

Programs

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SM
Sergey M
2 years ago

8th onsen of Shibu. Old-school. The water is somewhat cloudy with limescale deposits. Temperature at the time of the visit was hot. If you're not doing all of Shibu, you can skip this one.