The analysis posted near an onsen explains where the water comes from and what gives it its character.
What the Display Tells You
Look for the spring name, source temperature, pH, total dissolved components and the official spring classification. The posted document also shows the analysis date and the organization responsible.
- Source temperature
- pH value
- Spring type
- Total mineral content
Common Spring Types
Simple hot springs are gentle and widely found. Chloride springs tend to feel warming, bicarbonate springs may feel smooth on the skin, and sulfur springs have a distinctive aroma. Experience varies by facility and water management.
- Simple spring
- Chloride spring
- Bicarbonate spring
- Sulfur spring
Check Before Bathing
Natural water can be very hot, acidic or mineral-rich. Read warnings, avoid long soaking and rinse only when the facility recommends it. People with health concerns should seek professional guidance.
- Enter slowly
- Keep the first soak short
- Follow posted contraindications