Application of Rice Husk Silica Ash Activated using NH4OH to Reduce Calcium Ion (Ca2+) Levels in Brackish Water

L. Harimu, Mutmainnah, Dahlan, W.O. Mulyana, E. C. Mandasar, I. W. Sutapa, A. Kamari

International Journal of Acta Material Vol. 2 No. 1 2025 DOI 10.62749/ijactmat.v2i1.21