Coagulation of suspended and colloidal particles in water
using various forms of aluminum sulfate has been known since the 17th century.
Although historical details are lacking, in the early days of water purification by
coagulation, lump or slab forms
AWWA B403-2003 history
0000 AWWA B403-2016
2009AWWA B403-2009 Aluminum Sulfate-Liquid, Ground, or Lump
2003AWWA B403-2003 Aluminum Sulfate - Liquid, Ground, or Lump