The article presents the results of experimental tests on improving the grate used in the process of cleaning large trash, as well as the results of
experimental tests under production conditions. With a grate diameter of 15 mm, a distance between them of 40 mm, and a distance between the serrated drum of 17 mm, it was found that the amount of trash separated during cleaning increases. On the contrary, a decrease in the amount of cotton fly in the trash separated was achieved.