FERI - ΤRI S.A. has a special license for the removal and recovery of "pickling acid", code E.A.11.01.05 *, which is "hazardous" liquid waste created by chemical cleaning with hydrochloric acid of surfaces of steel components.  The quantity and quality of these liquid wastes are monitored and examined closely both by the Authorities and by the company itself. Liquid waste that is highly contaminated with heavy metals may not be used yet in processes carried out by   FERI – TRI, but it must instead be transported to specialized collection companies abroad.