The rainwater that fell on Spanish explorer Hernando de Soto here in the 16th century is even now bubbling out of the ground into the historic bathhouse that Rose Schweikert has turned into a restaurant.
It has changed a lot since it first fell as rain some 4,000 years ago, picking up some carbon dioxide here, some acids and minerals there, and filtering about 7,000 feet below the Earth’s surface before shooting back up at a temperature of about 285 degrees F.
https://www.csmonitor.com/Environment/2018/1012/Arkansas-alchemy-In-Hot-Springs-s-rebirth-a-lesson-for-national-parks
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