The thermal mineral waters at the Hotel o2 were used by the Cahuilla Indians for over one thousand years and are unique as they are one of the few odorless thermal mineral springs in North America. All of our pools are filled with this natural mineral spring water, which originates thousands of feet underground and comes to the surface at a temperature of over 112°F / 44°C. We maintain the main pool between 87°F / 30°C and 90°F / 32°C in the winter and 85°F / 29°C and 87°F / 30°C in the summer. The large spa/Jacuzzi sits at 104°F / 40°C, while the smaller cowboy hot tub in the back garden can be used as a cold plunge or heated upon request. Temperatures for the Turkish shower, also located in the back garden, average 112°F / 44°C but may vary slightly, as the water comes directly from the deep aquifer.