Defines requirements, test methods, the marking and evaluation of conformity for packaged and/or on site assembled tertiary treatment units used for treated wastewater normally coming from: products according to EN 12566-3, products according to EN 12566-6, installations according to TR 12566-5. Covers the following processes: Biological processes: slow filtration with or without vegetation, Physical processes: filtration, cartridge and drum membranes, reverse osmosis, ultra-filtration, Chemical processes: dosing with chlorine or ozone, dosing with iron or aluminium derivatives for flocculation, Electrical processes: ultra-violet, electrolysis. It covers only tertiary treatment units that are provided alone.

NEN EN 12566-7:2009