Effectiveness of the Combination of Alum (Al₂(SO₄)₃) and Calcium Hydroxide (Ca(OH)₂) Coagulants in the Removal of Manganese (Mn) Using the Coagulation-Flocculation Process: Efektivitas Kombinasi Koagulan Alum (Al2(SO4)3) Dan Kalsium Hidroksida (Ca(OH)2) Pada Penghilangan Logam Mangan (Mn) Menggunakan Proses Koagulasi-Flokulasi. Stannum 2024, 6 (2), 71-78. https://doi.org/10.33019/jstk.v6i2.4301.