Incorporating discharge electrode technology that can be sized to specific applications, HEI Wet Electrostatic Precipitator concentrates high-intensity ionizing corona in strategic areas within collecting tubes instead of distributing it along entire length of tubes' treatment area. Resultant particle charging fields are stronger than conventional precipitators and deliver higher particulate charges and migration velocities, as well as smaller size for gas capacities from 1,000–300,000 acfm.