monitored via temperature sensor 70 at the end of the normal distillation process when the still content is cooked down to a residue from which little or no further solvent can be boiled the controller 48 is set to perform the azeotrope function upon activating the controller 39 s azeotrope function the heat to still 14 is automatically shut off when the temperature of the still 14 contents drops below 195 degrees fahrenheit it is sensed by the temperature sensor 70 and electronically communicated to the controller 48 the still 14 heat is turned back on and the controller 48 automatically activates the injection pump 71 injection pump 71 injects through tube 16 a measured amount of separated water from tank 22 to still 14 by automatically adding water to the still 14 in the appropriate amounts at the appropriate temperature an azeotropic mixture is created depressing the boiling point of the solvent water mixture to approximately 205 degrees fahrenheit this causes the solvent and water to be vaporized at a lower temperature significantly reducing the solvent content in the remaining still residue the water and solvent vapor are then condensed in still condenser 9 and flow into the dry cleaning machine water separator 18 the separator 18 returns the solvent to the appropriate tank in the dry cleaning machine and the separator waste water 28 flows into the tank 22 via separator outlet tube 20 and tube 32 for evaporation after the azeotropic solvent water mixture has evaporated the still temperature rises the temperature sensor 70 communicates the.