The potential of granular-activated carbon (GAC) derived from agrowaste of Mangostene (Mangostana garcinia) fruit peel was investigated in batch and fixed bed system as a replacement of current expensive methods for treating wastewater contaminated by manganese. Mn(II) cations. Batch equilibrium data was analyzed by Langmuir. Freundlich. https://allfixelectricales.shop/product-category/rangehood-control-pcb/