There used to be only steam here until the Taipei Water Department enlarged and deepened the fissures of more than 30 fumaroles, built walls around them and brought in cold water. The result was that the steam and cold water combine to make hot springs. With luck, you can see the water spurt three meters high. The water here reaches 90 degrees centigrade and has a pH of 3-4.
本來這裡只有熱氣而沒有溫泉，但是台北市自來水事業處想到一個辦法，就是將三十多處噴氣孔鑽孔以加深加大，並砌上圍牆、灌入冷水，使熱氣將冷水變成溫泉，運氣好的時候，還可以看到溫泉噴高達三公尺，水溫達攝氏九十度。