ProDecon® Project Managers have decades of process unit chemical cleaning experience gained at many oil refineries around the world. In between refinery TAR’s ProDecon is regularly called upon to assist plant recovery from production slow-downs or unit crashes where heavy oil viscosity issues have caused, or closely follow, equipment failure. ProDecon has developed the chemistry and expertise to help mitigate such losses. Before, During, or After the event. ProDecon® Supplies and Applies the Solution.