Fajri, A.A., Tb. Ade Rahmatullah, Gurruh Dwi Septano and Nasaruddin 2025. Analysis of Hardness Level in Enim River for Demineralization Water Process in Thermal Power Plant Tanjung Enim. Jurnal Informasi dan Teknologi. (Jul. 2025), 67-75. DOI:https://doi.org/10.60083/jidt.vi0.632.