N. I. . Abd Aziz, “Optimization of pH and Contact Time of Media in Removing Calcium and Magnesium from Groundwater”, IJIE, vol. 11, no. 9, pp. 063–072, Dec. 2019, Accessed: Apr. 07, 2026. [Online]. Available: https://publisher.uthm.edu.my/ojs/index.php/ijie/article/view/5429