Effect of Filter Media Thickness on Reducing Lime Levels in Groundwater

Abstract

Water is a necessity that cannot be separated from the lives of living things. According to the Regulation of the Minister of Health of the Republic of Indonesia, the maximum permissible level of hardness is 500 mg/l. The condition of the clean water in Kedungwaru Village, Sugio District, Lamongan Regency has lime contamination because it is located near limestone mountains, so it needs to be filtered. The purpose of this study was to determine the effect of the thickness of the filtration media of ginger coral and pumice on reducing the levels of lime in groundwater. As well as providing recommendations for filer designs based on experimental data. This research is experimental using a filtration process with ginger coral  and pumice media by varying the thickness of the filter. Based on the results of the study, there is an effect of the thickness of the filter media on the decrease in the levels of lime in groundwater. The value of the effectiveness of each filter is a decrease in lime levels. In filter 1, the reduction effectiveness was 31.88%; in filter 2, it was 36.23%; in filter 3, it was 34.78%; in filter 4, it was 39.13%; and in filter 5, it was 26.08%. The most effective result for reducing total hardness is filter 4.