Rotating drum sieves are thin grids safely used with all kinds of process wastes of leather, food, dye, textile, paper, sugar, etc. İndustries, as well as domestic and industrial waste water treatment plants. Rotating drum consists of the drum part of sieve, and special triangle cross-section bars. Solid wastes accumulate in the outer surface of the drum. Based on this special cross-section it is almost impossible that the grid will occlude; and it enjoys a hight level of porosity. Wastes collected at the outer surface of grid drum are peeled through a peeler blade and discharged in an accumulating container or directly into the conveyor system. A compressed water spray mechanism is located in the grid drum against possible occlusions.