Tassu EDF has major improvements and advantages compared to conventional ESP. The diffusion charging technology uses clean air flow ionization, where the ions are injected into the bypassing process gas flow. These unipolar ions repel each other thus filling the gas space immediately. The ions round on the particles in the gas flow and give them charge. Particles are then collected from the gas stream typically on metal surfaces of the boiler.

The EDF design is based on the amount of process gas, particulate matter density and desired cleaning efficiency. The Tassu EDF can be used in low temperature, high humidity applications (NASU W-EDF) or in high temperatures and dry environments (NASU H-EDF). A typical application for W-EDF is in applications where exhaust gas is cleaned in a wet scrubber before the particulate matter is removed. H-EDF is used in bio mass combustion, glass manufacturing, metal foundries, etc., where the process creates hot exhaust gases.