Technologies. Exergy's technologies involve a variety of membrane and electrochemical principals to solve broad industrial problems. Exergy's advanced membrane-based systems, include Advanced Diffusion Dialysis (DD), Continuous Electrodeionization (CEDI), Membrane Electrolysis (ME), Electrodialysis (ED) and Reverse Osmosis (ARO). The Company also provides conventional membrane technologies such as ultrafiltration to complete its designs.