N. N. Ismail, “Experimental study on Ion Exchange Rate of Calcium Hardness in Water softening process Using Strong Acid Resin DOWEX HCR S/S”, NUCEJ, vol. 19, no. 1, pp. 107–114, Jan. 2017, Accessed: Dec. 23, 2024. [Online]. Available: https://oldjournal.eng.nahrainuniv.edu.iq/index.php/main/article/view/50