Search for: [Abstract = "Water Treatment Plant \(WTP\) in Goczałkowice belongs to the Upper Silesian Waterworks in Katowice. Production of WTP Goczałkowice is around 45% of the total production of drinking water in the whole waterworks. The paper presents results of studies on changes in the concentration of ammonium nitrogen \(N\-NH4 \+\) and nitrate nitrogen \(N\-NO3\-\) in water collected after various treatment processes."]