Penggunaan Arang Aktif Berbahan Dasar Limbah Biomassa Pada Proses Filtrasi Air Groundtank Ditinjau dari Uji TDS, Uji Kejernihan dan Uji Fe - Yeni Ristya Wardani; Mardhiyyatin Naqiyah; Devy Nurmayanti; Abdul Aziz N Rohman; Suparno Suparno (Department of Physics, Faculty of Mathematics and Natural Sciences, University of Lampung, 2020)