STT Indicator name Unit Technical requirements Test method 1 External inspection – Fine powder, yellow brown color Visual observation 2 Alkalinity % ≥70 JIS K 1475:2006IS 15573:2005 3 Coagulant content Me,O3 (total content of Al 2 O 3 and Fe 2 O 3 ) % ≥30 JISK 1475:2006 IS 15573:2005 4 Water insoluble residue content % ≤1,0 JISK 1475:2006TCVN 4560:1988 5 AS content ppm...
