In autumn 2020, the PhD student Rasmus Klapp, together with Luleå municipality, constructed a two-stage reed bed system on pilot scale at the treatment plant in Ängesbyn (Luleå municipality). The plant is dimensioned for ten PE. The system is used in many smaller towns in France and will now be tested in a sub-arctic climate. The wastewater is led directly into the first stage wetland without pre-sedimentation and particulate matter composting on the surface, which means that the sludge does not need to be transported. Reed bed technology requires relatively large areas but is appealing aesthetically. Phosphorus treatment takes place in a subsequent apatite filter that will be installed next year. Due to the simplicity of the technology, this system solution has great potential in rural areas in Sweden where simple, robust solutions with good treatment capacity are needed and which also reduce the environmental impact of sludge management. The project focuses on optimizing the treatment of phosphorus, nitrogen, BOD and bacteria but the treatment capacity of micro-pollutants and microplastics will also be investigated.