R eusing waste water for ablution is an alternative in reducing excessive use of groundwater. Alternative processes that can be used in the treatment of ablution water waste are filtration techniques using activated carbon media and silica sand as well as disinfection. This study aims to determine the most effective composition of activated carbon and silica sand to improve water quality in filter reactors and to determine the efficiency of reducing turbidity, pH, iron, manganese, color, odor, taste, E. Coli and Total Coliform in filter reactors. This type of research is quantitative with experimental instruments. The sampling technique in this study was grab sampling and then the samples were tested in the laboratory. Based on the results of laboratory tests, it was shown that the amount of decrease produced was in the composition of activated carbon media with a thickness of 0.7 m and silica sand and the chlorine content used was 2 mg/L with color parameters was 88.67%, iron was 98.81%, manganese was 97.01%, turbidity was 93.67%, E. Coli was 100%, and total coliform was 100%. This shows that the composition of activated carbon filter media with a thickness of 0.7 m and a chlorine content of 2 mg/L is more effective in reducing the parameters of color, odor, taste, iron, manganese, turbidity, E. Coli, and total coliform.