Tominoyu

富の湯とみのゆ

Other
Kyushu & Okinawa·Kagoshima

Day Use

Yes

Bathing & Water

OnsenYes

Uses natural hot spring water

国分5号

Kokubu No. 5

Operated by · 岩戸温泉(一般公衆浴場)

Sampled at wellhead
Bicarbonate
Classification

Sodium Bicarbonate spring

A sodium-led bicarbonate spring of the classic jūsō-sen style, rising at a hot 55.2 °C in Kirishima. Weakly alkaline (pH 7.9) and soft on the skin, it sits squarely in Japan's beauty-water family. A generous 207.9 mg/kg of metasilicic acid leaves the kind of silica film that makes skin feel noticeably smoother after a soak.

pH
7.90
Weakly alkaline
Source temperature
55.2°C
Hot
Tonicity
1.59g/kg
Hypotonic
Free CO₂
26mg/kg
Low
Radon
10Bq/kg
Low
Color
colorless and transparent
Taste
tasteless
Odor
odorless
Highlights
  • High silica

Analyzed May 21, 2019·株式会社東洋環境分析センター·Cert no. 鹿児島県第4号

Programs

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SM
Sergey M
1 year ago

358. Tominoyu, Kirishima, Kagoshima Old-school onsen for 420 yen. Operating hours listed as 09:00 to 22:00 (closed Mondays). They stamp the 88 Onsen of Kyushu book. It was part of an online achievement for Kirishima (I didn't participate — the app wouldn't even install on my Google account). The owner is a very nice old man who first gave me a bamboo cup from the shop, and in return for my matryoshka — two more wooden toys. As I understood it, the wooden items sold in his shop are handmade by him or someone local. Photos of the baths from the internet match. Inside: two baths with clear brown, slightly cloudy water. One bath is temperature around 41.5, the second around 44. There's a sauna and cold bath. With such a warm reception, how could I not recommend this place? It was wonderful of course.