The waste water treatment plant is located in the outskirts of the town of Lenti on 23/4 Hr., along the Kerka stream. On the basis of the valid water rights operating licence: A conventional activated sludge treatment plant with a capacity of 13 200 LEÉ. The biological capacity of the waste water treatment plant should be increased during the planned extension: The following development needs arise in advance in relation to the existing waste water treatment plant: — replacement of a mechanically cleaned grid — the volume of the biological pool must be increased in order to remove nitrogen effectively — the covering of the pools must also be solved — sand and grease trap construction — construction of a new plant lifter — construction of a post-setter — conversion of disinfectant (construction of post-filtering) — mud thickener — construction of sludge storage — construction of control and control technology — reconstruction of chemical dosing. — construction of a new aeration system, replacement of batteries — installation of higher power blowers — installation of more powerful mixers — remote signalling in the dispatch centre (sewage treatment plant and network lifters) — automatic sampling devices (raw and treated waste water) sewer network: There is a need to improve the sewerage network in the area of the town below. It is planned to require 1.790 fm channels and 29 new connections. Furthermore, in addition to the new connections, reconstruction works are needed for the sewerage network, which does not exceed 5 % of the total eligible cost of the project. It is necessary to examine at which sections the spinal line and the wiring are to be replaced. In addition, diagnostic testing is required because there is a significant influx of foreign water. Cleaning mines are sometimes refurbished.