- The hot spring source at the entrance to the large baths is especially recommended for people with gastrointestinal disorders.




Kasuikyo's onsen (hot spring) is a 100% natural spring (temperature controlled/cleaned by circulation filter)
- Onsen water temperature: 72 degrees Celsius (atmospheric temperature 21 degrees Celsius)
- Output: 200 liters/minute (via pump)
- Physical characteristics: Colorless and transparent/hydrogen sulfide odor/strong salty, acrid taste
- Included elements: Sodium, calcium chloride (hypertonic, neutral, high temperature onsen)
- Submersion is useful for: Nerve pain, muscle pain, beautifying skin, "frozen shoulder," palsy, stiff joints, bruises, sprains, chronic digestive problems, hemorrhoids, sensitivity to cold, recovery from illness/fatigue, health improvement, cuts, burns, chronic skin ailments, physically weak children, female diseases, etc.
- Drinking the water is useful for: Chronic digestive ailments, chronic constipation.