Wastewater treatment plants - Part 6: Activated sludge process; German version EN 12255-6:2002
Edition 2002-04

Wastewater treatment plants - Part 7: Biological fixed-film reactors; German version EN 12255-7:2002
Edition 2002-04

Wastewater treatment plants - Part 13: Chemical treatment; Treatment of wastewater by precipitation/flocculation; German version EN 12255-13:2002
Edition 2003-04

Event sustainability management systems - Requirements with guidance for use (ISO 20121:2012)
Edition 2013-04

Plain bearings - Bearing metal lining for thick-walled multilayer plain bearings
Edition 1983-12

Chemicals used for treatment of water intended for human consumption - Calcium magnesium carbonate; German version EN 16003:2011
Edition 2012-02

Chemicals used for treatment of water intended for human consumption - Magnesium oxide; German version EN 16004:2011
Edition 2012-02

Products used for treatment of water intended for human consumption - Pyrolyzed coal material; German version EN 12907: 2009
Edition 2009-07

Products used for treatment of water intended for human consumption - Bentonite; German version EN 13754:2009
Edition 2009-07

Products used for treatment of water intended for human consumption - Granular activated alumina; German version EN 13753:2009
Edition 2009-07