The scrubber is a filtering device to abate the concentration of VOC and dust found in gas streams. It is used when the substances to be removed react in water.

Abatement takes places through impact between the nebulised washing liquid and the pollutants in the air. The polluted air is suctioned into the lower part of the washing tower and is washed in counter-current at low speed over a broad contact surface.

Wet abatement systems can be composed of several washing stages, even with different types (e.g. Venturi scrubber, floating washing tower, static washing tower, horizontal scrubber) and with different washing solutions according to the pollutants to be removed and their concentrations.