The paper presents an overview of the geopolymer concrete based fly ash as well as zeolite and titanium dioxide powder as an admixtures to create a nitrogen removal in polluted water. This geopolymeration process occurred from the fly ash or zeolite powder and fine aggregate are mixed together with the alkaline solution to form geopolymer concrete. The sodium silicate solution and the sodium hydroxide are chosen and mixed together to produce the alkaline solution. The geopolymer concrete acts as the rough film, contaminants removal in polluted water body and consequently acts as antifouling. The surface of foulant layer created from the contaminant itself that need to mitigate time to time. Meanwhile, the water sample was collected from the selected stations, i.e.; Sungai Gombak, Sungai Klang and Sungai Batu. The existing data quality of water at Sungai Gombak was applied from Department of Irrigation and Drainage (DID) to be analysed and compared to the results from water quality assessments of water without/with treatment. The current values of water quality were captured in year 2012. The water quality index for Sungai Klang is 57.05 in Class III similar class to Sungai Batu valued is 54.7 and while the Sungai Gombak has no station to capture the values. The rivers are identified that contain polluted water but still suitable for fishery. The aim of the study at those polluted rivers is to reduce and remove the amount of high concentrations of nitrogen via zeolite reactions meantime to mitigate the foulant layer on the film surface
