“TREATMENT COAGULANT AID DAN FILTRASI MANGANESE GREENSAND DALAM MENURUNKAN KADAR MANGAN DAN KLORIDA”. WAKTU: Jurnal Teknik UNIPA, vol. 17, no. 2, July 2019, pp. 37-44, https://doi.org/10.36456/waktu.v17i2.2135.