And why is that? If you are thinking volatile means dangerous, it DOES NOT. It simply means that a substance has a VERY HIGH vapor pressure, which means it will evaporate VERY QUICKLY.
And I have been using it for 5 years now, and nothing bad has ever happened, and I have used normal plain water instead, and a 7-14 degree celcius difference is seen, so it is perfectly safe and I HIGHLY recommend it.