Chloride spring water sourced from 1,300 meters underground. Enjoy 100% pure flowing spring water without any added water or heating in the open-air and private baths. After bathing, salt adheres to the skin, providing high moisturizing effects. The water feels like a salt film, offering excellent heat retention and making it difficult to cool down, hence called 'netsu no yu.' It is also known for its strong sterilizing effect as 'kizu no yu,' promoting recovery from skin irritations and cuts. The large public bath includes high-temperature and jet baths, allowing for preference-based use. In the open-air bath, enjoy the fresh spring water while gazing at passing clouds by day and starry skies by night. Especially recommended for those with dry skin or sensitivity to cold, leaving the skin moist and a lasting warmth from the core.