Fajar, M., Angreni Limbong, R., & Utami, R. (2023). STUDY ON THE EFFECTIVENESS OF ACTIVATED CARBON FOR REDUCING HARDNESS AND IRON (FE) CONTENT IN WELL WATER. ingkar: ournal of nvironmental ngineering, 5(1), 1–9. etrieved from https://journal.ar-raniry.ac.id/lingkar/article/view/6006