In addition to all calculations and projects, installation of 1700 m long glass reinforced polyester flange pipe with 600 cm diameter on the bottom of the undersea ground, manufacturing the diffuser, installation of 600 mt long pipe with 600 cm diameter at shore exit and construction of the biologic treatment plant on the city sewage output, pump building and administration building. Can realised this construction under the rough conditions of the Black Sea, making all the calculations and projects; this project has been among the first in Turkey in the use of GRP pipes for the discharge of waste water, in which the flanged pipe, of 1.700 mtul. and a diameter of 600 cm., was iaid on the sea floor, diffusors were built, 600 mtul. long steel pipes, with the same diameter, were İaid and the biological treatment plant, pump building, administrative and control building were constructed in the outlet of the city sewage system.