Szukana fraza: [Abstract = "Moreover sanitary tests of the lake were performed in Water Treatment Station \(ZUW\) in Zielona Góra and furthermore physicochemical tests were made by the central laboratory of the Institute of Environment Engineering of the University of Zielona Góra. The purpose of conducted observation was evaluation of the water quality of Droszków lake and specifying its quality class using biological method. In the second half of August cyanobacterial blooms was observed. The dominating species were Microcystis flos\-aque and Anabaena solitaria."]