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Aluminium SulphateThe material should conform to Kenya Bureau of Standard KS-03-85:2003.The material shall be white, light gray or brown in colour and in form of powder, granules or lumps, free from visible impurities and almost entirely soluble in water.5.3.3 Physicochemical characteristics and requirements Item Characteristic Requirement Grade 2 (i) Iron content calculated as Fe maximum % (m/m) 0.14 (ii) Aluminium content calculated as (AL2O3) % (m/m) minimum 16.5 (iii) Insoluble matter content, % (m/m) maximum 0.20 alum alum