Asahi Spring
Analysis UnverifiedNestled in the rolling hills of Niwasaki, Asahi Onsen emerges quietly amid a landscape graced by views of the Southern Japanese Alps. This intimate, community-rooted hot spring sanctuary welcomes those seeking to gradually unwind from daily fatigue and travelers yearning to step away from the bustle of modern life to gently restore both body and spirit.
The bar length shows how abundant each component is compared to thresholds that make it "distinctive" (therapeutic spring standards, beauty spring criteria, etc.).
A trace component with gentle antibacterial and anti-inflammatory action.
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.
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.
With a spring temperature of 38.2°C—a pleasantly mild warmth—Asahi allows for extended soaking sessions. Immerse yourself for 15–20 minutes to experience how chloride ions and bicarbonate work synergistically to warm you from your deepest core. After bathing, let the mineral-rich waters settle briefly into your skin before gently patting dry; this technique amplifies the skin's natural moisture retention.
At pH 7.9 (weakly alkaline) with abundant bicarbonate ions (396.3 mg/kg), Asahi's waters smooth and soften the skin's surface—ideal relief for those battling rough patches or skin conditions. Chloride ions (320.1 mg/kg) lock thermal energy deep within, delivering the 'heat-retaining' effect particularly beneficial for those managing poor circulation and joint aches. The gentle 38.2°C spring water places minimal stress on the cardiovascular system, making it well-suited for those with elevated blood pressure and those seeking restorative recovery.
Avoid bathing during acute illness, malignant tumors, severe cardiac conditions, or early pregnancy. Drinking the spring water is not currently documented in analysis records; please consult the facility regarding potability.
※ See the analysis data below for detailed contraindications
ANALYSIS DATAView all analysis fields ▼
Source Info
- Source name
- あさひ温泉
- Spring type
- ナトリウム-塩化物・炭酸水素塩泉
- Source temperature
- 38.2℃
- pH
- 7.9
- Flow rate
- 198 L/min
- Flow type
- 動力揚湯
- Osmotic pressure
- 低張性
Analysis Document
- Analysis date
- 2018-05-01
- Analyst organization
- 株式会社 山梨県環境科学検査センター
- Registration No.
- 14山梨み自第1号
Cations
- Hydrogen ion H⁺
- 0.00 mg/kg
- Lithium ion Li⁺
- 0.10 mg/kg
- Sodium ion Na⁺
- 330 mg/kg
- Potassium ion K⁺
- 13.1 mg/kg
- Ammonium ion NH₄⁺
- 0.30 mg/kg
- Magnesium ion Mg²⁺
- 14.6 mg/kg
- Calcium ion Ca²⁺
- 22.1 mg/kg
- Aluminum ion Al³⁺
- 0.00 mg/kg
- Manganese ion Mn²⁺
- 0.10 mg/kg
- Iron(II) ion Fe²⁺
- 0.10 mg/kg
- Iron(III) ion Fe³⁺
- 0.40 mg/kg
- Strontium ion Sr²⁺
- 0.30 mg/kg
- Barium ion Ba²⁺
- 0.10 mg/kg
- Total cations
- 0.38 mg/kg
Anions
- Fluoride ion F⁻
- 0.80 mg/kg
- Chloride ion Cl⁻
- 320 mg/kg
- Thiosulfate ion S₂O₃²⁻
- 0.00 mg/kg
- Sulfate ion SO₄²⁻
- 63.9 mg/kg
- Bicarbonate ion HCO₃⁻
- 396 mg/kg
- Carbonate ion CO₃²⁻
- 0.00 mg/kg
- Bromide ion Br⁻
- 1.0 mg/kg
- Iodide ion I⁻
- 0.20 mg/kg
- Hydrogen sulfate HSO₄⁻
- 0.00 mg/kg
- Hydrogen phosphate HPO₄²⁻
- 20.2 mg/kg
- Sulfide ion S²⁻
- 0.00 mg/kg
- Metaborate ion BO₂⁻
- 0.00 mg/kg
- Total anions
- 0.78 mg/kg
Undissociated Components
- Metasilicic acid H₂SiO₃
- 58.9 mg/kg
- Metaboric acid HBO₂
- 7.0 mg/kg
- Total undissociated
- 0.07 mg/kg
Dissolved Gas
- Free carbon dioxide CO₂
- 30.7 mg/kg
- Free hydrogen sulfide H₂S
- 0.00 mg/kg
- Total dissolved gas
- 0.03 mg/kg
Totals
- Total dissolved substances
- 1.2 mg/kg
- Component total
- 1.3 mg/kg
- Evaporation residue
- 1.0 mg/kg
Usage
- Heating
- No
- Dilution
- No
- Recycle / Filter
- No
- Additives
- No
- Disinfection
- No
Drinking
- Drinkability
- Not drinkable
