Waangsir FW, Arnawa GP, Sadukh JJ, Suluh DG. The Use of Various Filtaritaion Media in Lowering the Level of Water Hardness . jppipa, pendidikan ipa, fisika, biologi, kimia [Internet]. 2023 Mar. 31 [cited 2024 Nov. 24];9(3):1182-6. Available from: https://jppipa.unram.ac.id/index.php/jppipa/article/view/3086