Al Ghalowa uses a closed BioFilter-Container made in PE-HD with integrated H²S Reactor, Activated Carbon Filter and Technology Center made in Germany. The removal process takes place in two stages; first stage includes Biological scrubber, in which oxidation of hydrogen sulphide treated while the second stage has Activated Carbon Filter to completely remove extremely high and short lasting waste air peaks that passed from biological stages, these are adsorbed and removed in this stage.