Powdex powdered ion exchange resins and premixed versions are finely divided particles of bead resins. Although chemically the same, Powdex achieves rapid kinetic performance, while maintaining excellent hydraulic permeability. These products are applied to large surface area filter septa and then subjected to flow rates up to 4 gallons per minute per square foot of surface area. Condensate polishing is a major application. The original Powdex components allow for flexibility in setting cation to anion ratios. The Powdex Premix resins are easy-to-use, one-step preparation products providing operational benefits.