Z Radzi, E, M. S Wahab, M Z Sahdan, R Hamdan, and A A Raus. “The Effects of Using Stepped Cascade Aeration and Multimedia Filter System for Iron Removal in Groundwater”. International Journal of Engineering and Technology 8, no. 1.1 (January 24, 2019): 201–206. Accessed February 25, 2026. https://www.sciencepubco.com/index.php/IJET/article/view/24660.