伏目ヶ水7号
Fushimegamizu No. 7Operated by · ヘルシーランド露天風呂（特殊公衆浴場）
Sampled at wellhead
塩
Chloride
Classification
Sodium Chloride spring
A sodium chloride strong-salt spring, exceeding ocean salinity and leaving a thick mineral veil on the skin after the bath. The wellhead runs at 100.4 °C — among Japan's hottest natural sources, cooled before bathing — and the water reads colorless and clear at the source, faintly turbid and off-white in the lab, with a pronounced salty tang and no odor. Neutral pH belies a heavily mineralized brine: total dissolved solids reach 34,240 mg/kg, and an unusually generous 587.6 mg/kg of metasilicic acid layers a thin silica film over the salt, lending the water a smoother finish than the headline chemistry would suggest.
pH
7.30
Neutral
Source temperature
100.4°C
Hot
Tonicity
34.24g/kg
Hypertonic
Free CO₂
36mg/kg
Low
- Color
- at the wellhead: colorless and clear; in the lab: pale white, slightly turbid
- Taste
- strongly salty
- Odor
- odorless
Highlights
- Strong salt
- Top-decile hot
- High silica
Analyzed Dec 25, 2024·一般財団法人 鹿児島県環境技術協会·Cert no. 鹿児島県第2号
