Azmi A. Optimation Of Variation Of Massive And Contact Time Using Zeolit On The Reduction Of Iron Metal (Fe) On Dug Well Water In Air Molek Indragiri Hulu. Department of Physics, Universitas Negeri Padang [Internet]. 2025 Jul. 18 [cited 2025 Aug. 2];3(2). Available from: https://jeap.ppj.unp.ac.id/index.php/jeap/article/view/107