Dewi, A.L., Tanjung, R.A., Tajalla, G.U.N. and Parmita, A.W.Y.P. 2024. The Characteristics of Polyester Concrete with Local Sand of East Borneo as Filter . Indonesian Applied Physics Letters. 5, 1 (May 2024), 41–48. DOI:https://doi.org/10.20473/iapl.v5i1.58323.