Diharyo. (2020). EFFECTIVENESS TEST OF ABSORPTION CAPACITY OF ACTIVATED CHARCOAL BY IMMERSING H3PO4 AND GRAIN SIZE PALM OIL SHELLS ON INSTALLATION OF PEAT WATER TREATMENT. International Journal of Research -GRANTHAALAYAH, 8(5), 383–389. https://doi.org/10.29121/granthaalayah.v8.i5.2020.228