Kumihama Onsen Kongou-sen
Analysis VerifiedThis mixed spring at Kumihama Onsen was discovered by Rokuro Yamada, the founder of Osaka's "Kuidaore". By blending a high-temperature source of 51.2℃ with a low-temperature source of 32.0℃, it achieves a pure free-flowing source water experience, without any added water or reheating. The chloride spring water gently envelops the skin, providing restorative warmth that penetrates deep into the body and lingers long after bathing. It is an ideal hot spring for those seeking deep relaxation and rejuvenation by immersing themselves in nature's untouched blessings.
The bar length shows how abundant each component is compared to thresholds that make it "distinctive" (therapeutic spring standards, beauty spring criteria, etc.).
- Chloride (salt)840 mg/kg
- Feel
- Tastes salty; the warmth lasts after you get out.
- Said to
- Salt is said to form a film on the skin that keeps in heat and moisture. Bathing indications include cuts, poor circulation and dry skin.
- Note
- May sting cuts. Strong salty water can tire you—avoid long soaks.
Effects are general descriptions based on the Ministry of the Environment’s indications by spring type, not a guarantee.
Scores are calculated from mineral analysis data based on the Mineral Spring Analysis Guidelines (Ministry of Environment, Japan). They are unrelated to facility atmosphere or service quality.
▸Note
The temperature, pH and component values shown here are based on the hot spring analysis (source). Actual values in the bath may differ depending on heating, dilution, recycling and filtration. Please check current usage status at the facility.
Chloride springs create a veil of salt on the skin, which helps retain body heat. It is recommended to rinse lightly with a shower after bathing to leave the minerals on your skin. Its high moisturizing effect is suitable for dry skin. Take breaks to avoid overheating during long soaks.
With a weakly alkaline pH of 7.9, this spring is expected to have a skin-smoothing effect. The main component, chloride ions (Cl⁻ 840.1 mg/kg), coats the skin and prevents moisture from evaporating after bathing. This creates a high moisturizing and heat-retaining effect, earning it the name "Atsu-no-yu" (hot water for warmth). It is especially recommended for those suffering from poor circulation or dry skin.
Please refrain from bathing if you have general contraindications for hot springs, such as being in an active phase of an illness or feeling extremely weak. The spring is relatively mild, but be cautious about bathing for too long.
※ See the analysis data below for detailed contraindications
ANALYSIS DATAView all analysis fields ▼
Source Info
- Source name
- Kumihama Onsen Kongou-sen
- Spring type
- ナトリウム・カルシウム－塩化物泉
- Old spring type name
- 食塩泉
- Source temperature
- 33℃
- pH
- 7.66
- Flow rate
- 89 L/min
- Flow type
- 動力揚湯
- Osmotic pressure
- 低張性
Analysis Document
- Analysis date
- 2017-07-27
- Analyst organization
- 一般社団法人京都微生物研究所
Cations
- Lithium ion Li⁺
- 0.00 mg/kg
- Sodium ion Na⁺
- 398 mg/kg
- Potassium ion K⁺
- 10.0 mg/kg
- Ammonium ion NH₄⁺
- 0.00 mg/kg
- Magnesium ion Mg²⁺
- 7.2 mg/kg
- Calcium ion Ca²⁺
- 244 mg/kg
- Aluminum ion Al³⁺
- 0.00 mg/kg
- Manganese ion Mn²⁺
- 0.20 mg/kg
- Iron(II) ion Fe²⁺
- 0.00 mg/kg
- Iron(III) ion Fe³⁺
- 0.00 mg/kg
- Strontium ion Sr²⁺
- 2.0 mg/kg
- Barium ion Ba²⁺
- 0.00 mg/kg
- Copper ion Cu²⁺
- 0.00 mg/kg
- Total cations
- 662 mg/kg
Anions
- Fluoride ion F⁻
- 2.0 mg/kg
- Chloride ion Cl⁻
- 840 mg/kg
- Hydroxide ion OH⁻
- 0.00 mg/kg
- Hydrogen sulfide ion HS⁻
- 0.00 mg/kg
- Sulfate ion SO₄²⁻
- 245 mg/kg
- Bicarbonate ion HCO₃⁻
- 89.1 mg/kg
- Carbonate ion CO₃²⁻
- 0.00 mg/kg
- Bromide ion Br⁻
- 3.4 mg/kg
- Sulfide ion S²⁻
- 0.00 mg/kg
- Total anions
- 1180 mg/kg
Undissociated Components
- Metasilicic acid H₂SiO₃
- 30.6 mg/kg
- Metaboric acid HBO₂
- 1.6 mg/kg
- Total undissociated
- 32.2 mg/kg
Dissolved Gas
- Free carbon dioxide CO₂
- 0.00 mg/kg
- Free hydrogen sulfide H₂S
- 0.00 mg/kg
- Total dissolved gas
- 0.00 mg/kg
Totals
- Total dissolved substances
- 1870 mg/kg
- Component total
- 1870 mg/kg
- Evaporation residue
- 2310 mg/kg
Usage
- Heating
- No
- Dilution
- No
- Recycle / Filter
- No
- Additives
- No
- Disinfection
- No
Indications & Contraindications
- Bathing indications
- Cuts and grazes, Peripheral circulatory failure, Poor circulation, Depression, Xeroderma
- General indications
- High blood pressure (mild), Rheumatoid arthritis, Autonomic instability, Insomnia, Chronic pain or stiffness in muscles and joints, Muscle stiffness due to motor paralysis, Gastrointestinal dysfunction
- Contraindications
- Acute illness (especially with fever), Active tuberculosis, Malignant tumors, Severe heart disease, Respiratory failure, Renal failure, Bleeding disorders, Severe anemia, Any actively progressing illness, Pregnancy (especially early and late stages)
Drinking
- Drinkability
- Not drinkable
