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1by Zulkifli, Khairusy Syakirah“… hardness between 30-40 CaC03 mg/L, and thus is classified as soft water. From the study, it can…”
Published 2009
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2by Azza Nurshafira, Zul' Azman“…. Sungai Pengorak is considered soft water because the values recorded does not exceeded the NWQS standard…”
Published 2017
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