This facility allows visitors to observe the process of neutralizing Kusatsu Onsen's highly acidic hot spring water with lime. The unique 'Hyakunen-seki' (100-year stone) experience, where drawings on stones dissolve in the hot spring, is popular for creating travel memories. Staff explanations are clear and helpful, but it's recommended to check experience details and operating times in advance as they can vary.
May differ from your actual experience.
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