Setyowati, L., M. Raharjo, and Sulistiyani. “VARIOUS MATERIALS OF CARBON ACTIVATEFOR NATURAL COAGULANTS TO REDUCECHEMICAL OXYGEN DEMAND (COD) ”. International Journal of Health, Education & Social (IJHES), Vol. 3, no. 6, July 2020, pp. 14-21, doi:10.1234/ijhes.v3i6.93.