DS EN 12566-4:2008
DS EN 12566-4:2008 Small Wastewater Treatment Systems For Up To 50 Pt - Part 4: Septic Tanks Assembled In Situ From Prefabricated Kits Describes the requirements for septic tanks assembled in situ from prefabricated kits and ancillary equipment where applicable, used outside buildings for the partial treatment of domestic wastewater