This is natural. Wuyi Hot Spring, located in Wuyi County, Jinhua City, Zhejiang Province, is known as "Huaqing Pool in the South of the Yangtze River" and "Wuyi Qingshui Bay-Qin Hot Spring", also known as "the first hot spring in East China". Wuyi Hot Spring is a kind of natural spring, which gushes naturally from underground. The temperature of the spring mouth is obviously higher than the local annual average temperature, and it contains mineral water with trace elements beneficial to human health.