apps.doe.gov.myapps.doe.gov.my/portal_efiles/e_publication/view.php?file=Laporan+...- At hardness 50...
3
apps.doe.gov.myapps.doe.gov.my/portal_efiles/e_publication/view.php?file=Laporan+...- At hardness 50 mg/l CaCO N Maximum (unbracketed) and 24-hour average (bracketed) concentration