Penentuan Konsentrasi Optimum Aluminium Sulfat dengan Metode Jar Test Pada Instalasi Pengolahan Air Minum (IPA) Di PDAM Tirta Musi Palembang

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River water which is the raw material for drinking water contains certain levels of water quality, some of which are turbidity and pH. One step in processing river water into clean water is by eliminating water turbidity. Water turbidity can be removed by adding a chemical called a coagulant. Coagulant functions to bind particles or dirt contained in water into lumps that have a larger size so that it settles faster. One type of coagulant commonly used is aluminum sulfate or often called alum. This study aims to determine the optimum concentration of aluminum sulfate used in the process of purifying raw water and knowing whether the turbidity (turbidity) of water obtained after addition of alum meets drinking water quality standards. The method used to find the optimum dose is the Jar Test. Where the sample of raw water that has been put into a beaker glass is dropped alum with a concentration of 40 ppm, 42 ppm, 44 ppm, 46 ppm. Based on this research, the optimum concentration of alum was 44 ppm with turbidity of 2.45 - 3.81 NTU. Water turbidity at the optimum concentration of 44 ppm obtained after addition of alum meets drinking water quality standards based on Permenkes RI No. 492/MENKES/X/2010 that the maximum allowable level for physical parameters of turbidity is 5 NTU.