Dry pure grade salt is heated and then it is ground and crushed into very tiny micro-particles in a machine called a halogenerator. These dry aerosol micro-particles of salt are then dispersed into the salt room during a session. As the person relaxes in the salt room the micro-particles are inhaled as well as land on the skin. The particles penetrate deep into the lungs, bronchi, bronchioles, and alveoli as well as into the deeper layers of the skin.