Thermophilic bacteria are those that thrive within high temperatures, usually between 45 and 80 C (113 and 176F) and are found in environments such as hot springs, peat bogs, and near deep-sea hydrothermal vents.
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Hot-spring water is usually fairly safe from the standpoint of carrying disease-causing organisms, but some is not (see below under Stay healthy), and the surface water that cools a scalding spring to usable temperatures will be prone to the same bugs and pathogens as any other surface water.
Milky WhiteThis is due to the oxidation of hydrogen sulfide in the water, which transforms into insoluble colloidal particles. The colloidal particles make the water appear milky white.
Avoid pools that are hotter than 120 degrees. Hot springs can raise heart rate and blood pressure, and can pose a threat to people with health conditions. Pregnant women should consult a doctor before soaking in hot springs, especially during the first trimester.
We recommend getting out of the water for 5 minutes every 15 minutes or so. This largely depends on the temperature of the pool you're in. You might need to get out more often in a hotter pool and less in a mild pool. Listen to your body.
The minerals that make hot springs soaks so good for your health—sulfur in particular—can also generate an egg-like scent. The minerals are dissolved by the warm water as it comes to the surface from deep underground, so the amount of sulfur in the soil makes a difference.