Adsorption Effectiveness of Coffee Grounds Activated Carbon in Reducing Iron (Fe) Control in Water. Gema Lingkung Kesehatan [Internet]. 2026 Sep. 25 [cited 2026 Sep. 25];24(4):599-606. Available from: https://gelinkes.poltekkesdepkes-sby.ac.id/index.php/gelinkes/article/view/390