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Jasman, Jasman and Ronny, Ronny and Irfa’i, Irfa’i and Mahyudin, Dedi (2019) (Journal & Peer Review) Banana Stem Charcoal as Adsorbents Reduce Water Hardness Levels. lnternationalJournal of Environment, Engineering & Education, 1 (1). ISSN E.|SSN 2656-8039