Hairul Khamidun, M., Fazara Md Ali, U., & Abdullah, S. (2018). Calculation of Filter Lifetime Using Empirical Model Applied to Hydrodynamic Column for Phosphate Removal from Greywater. International Journal of Engineering & Technology, 7(3.9), 11-14. https://doi.org/10.14419/ijet.v7i3.9.15263