Use of active carbon tower is an requirement for sectors like medical, medicine, electronic, metal foundry, where use of sensitive technology is needed.  AAG active carbon towers are single tower pressurised vessels, which are filled with active carbon absorbents that remove the oil vapour within the pressurised air.

Other hydrocarbon vapours are also absorbed by the active carbon. Active carbon is activated by the absorbing contaminants that are on the surfaces of the internal holes. This process continue until it reaches to its saturation point. When it reaches at its saturation point, then the active carbon should be replaced.