Flooded condenser control is by far the preferred pressure-control method used with water-cooled total condensers (those generating liquid products only). It is also common with air-cooled total condensers. In this control method, the condenser area is partially flooded by condensate. Despite their importance in tower pressure control, flooded condenser controls have been some of the most challenging distillation-control techniques. However, operating experience indicates that they can be quite trouble-free when correctly designed and applied. The principles and experiences described in this article will pave the way for flooded-condenser controls’ successful application for tower pressure control.