Szukana fraza: [Abstract = "Lake Gopło is a highly polluted body of water. The sources of the pollution are diverse. It comes from municipal and industrial waste as well as from dispersed sources. One of the main sources of biogen supply is also bed sediment, especially in the northem part of the lake near Kruszwica. To reduce this internal supply, two sets of aerators have been installed in the northem part."]

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