Sewage: This class includes: - collection, treatment and disposal of domestic sewage and rainwater, by means of collectors, storage tanks (reservoirs), sewerage networks or by other means (e

G. vehicles) - treatment of wastewater by physical, chemical and biological means: dissolution, filtration, settling, etc. - maintenance and cleaning of sewage networks, sewage collectors, drains - emptying and cleaning of cesspools, sludge traps, septic tanks - maintenance of bio-toilets - treatment of industrial and swimming pool wastewater. Excludes: - decontamination of polluted environments, surface and groundwater, see 39.00.0 - cleaning of rainwater pipes in buildings, see 43.22