Scrapers this type of basin construction in the center of the carrier moving back over the circular scrapper and outer walls of the basin consists of walking schemas. Scrapers are using for the system at the final setting of the sludge and throwing out them scrapers basin are for diameter 6- 42 m circular settings tank for collecting the deep sludge and foams. Peripheral speed of the circular turn 2-3m/min. This makes healthy throw out and mixture without creating the sludge. The circular bridge between them is special design product with sheet can carry every static and active load safety.