Abdulrazzaq, Ghassan. “Reducing the Water Hardness by Using Electromagnetic Polarization Method”. Al-Khwarizmi Engineering Journal 12, no. 4 (December 18, 2017): 111- 116. Accessed April 15, 2021. https://alkej.uobaghdad.edu.iq/index.php/alkej/article/view/325.