Influence of Sodium Carbonate Activator Concentration and Activated Carbon Size on The Reduction of Total Dissolved Solid (TDS) and Chemical Oxygen Demand (COD) of Water - Diah Puspita Nurmalasari; Susilowati Susilowati; Avido Yuliestyan; I Gusti S. Budiaman (Prosiding Seminar Nasional Teknik Kimia "Kejuangan", 2019)