The project includes the extension of the sewage treatment plant in the Istebna Agglomeration: — In the Istebna-Gliniane treatment plant: overhaul of existing construction works; dismantling of used installations and equipment; demolition of building elements of existing facilities; installation of new mechanical and technological equipment; construction of new technological facilities necessary to complement the existing sewage treatment system and treatment of sewage sludge. — In the treatment plant of Horses-Pustki: renovation works related to the reconstruction of existing construction works; dismantling of used installations and equipment; demolition of the steel BOS reactor; replacement and assembly of new mechanical and technological equipment; construction of new technological facilities and installations necessary to complement the existing sewage treatment system and treatment of sewage sludge. The project will result in modern and environmentally friendly sewage treatment plants.