Roto-Sieve installation in the municipal wastewater treatment plant of Qing He in China. Worldwide, nearly 5000 Roto-Sieve units are efficiently screening wastewaters and process waters in very diverse applications. The perforated drum screen with round shaped perforations (as small as 0,6 mm) assures the best possible mechanical separation of fibers and smalll particles. The Roto-Sieve rotating drum screens can be used for any application were fibers and/or small particles are to be separated from liquids. Specific features such as the overflow system, the self-cleaning capacity and the adaptable inlet pipes allow to offer a solution for any specific problem.