The film tells about the problems of pollution and environmental protection on the territory of Ukraine. The film uses filming: Garbage on the Black Sea coast. Wastewater flows into one of the reservoirs. The pipes of one of the petrochemical enterprises smoke. Experimental station for biological water treatment in Donetsk region: treatment facilities are in operation; fiberglass ruff manufacturing process; engineer NIKulikov talks about his invention (sync.) Employees of one of the laboratories study microorganisms through a microscope. Production facilities of the Chernihiv chemical fiber plant. The technological process of biological water purification.