The problem of pollution of reservoirs is widespread in the territory of the Russian Federation. The sources of pollution are diverse. Sewage treatment plants are the most dangerous source of pollution, as water is continuously discharged into reservoirs. Even the slightest excess of standards for pollutants subsequently causes irreparable damage to the environment. This article describes a method aimed at reducing the impact of wastewater treatment plants on reservoirs. The long service life of the facilities leads to a large percentage of physical wear and tear of the equipment. There are a number of technical problems related to the quality of wastewater treatment, as practice shows, this affects all stages of treatment. Mechanical wastewater treatment occurs at the very beginning, and the effectiveness of wastewater treatment in subsequent stages depends on it to a greater extent. To reduce emergency shutdowns of primary settling tanks, increase the efficiency of mechanical wastewater treatment, a developed utility model of a filter is presented, aimed at additional wastewater treatment from small debris that mechanical grids are not able to catch.