Gas generators provide an onsite supply of gas, vapor or humidity (water vapor) eliminating the need for delivery in gas cylinders, which can be bulky and may have special storage requirements. Gas generators provide a continuous supply of high purity gas from existing compressed air.  Gas generators can be used in a variety of applications including general industrial, military, wastewater treatment and disinfection, odor control, chromatography, general laboratory, air pollution and calibration.  Common gas generation technologies include endothermic, exothermic, dissociation, cryogenic, membrane or molecular sieve, vacuum pressure swing adsorption (VPSA) and water electrolysis or electrolytic.