Estimates suggest that Class 4 moisture content according to ISO 8573-1 is acceptable in the majority of compressed air system applications, thus supporting the use of refrigeration dryer technology. However, where applications demand higher levels of moisture removal, desiccant tends to be the go-to technology. The long-standing problem here is the higher cost associated with desiccant dryers, which is why HI-LINE INDUSTRIES, a UK-based leader in the design, manufacture and installation of energy-efficient compressed air purification equipment, is addressing this issue with its new Hi-Plex dual technology dryers. This hybrid solution combines Hi-line’s established refrigeration and PSA (Pressure Swing Adsorption) air treatment technologies, creating an energy-efficient system at low capital cost compared with standard heat-regeneration desiccant air dryers.