em 14 First Treat water with disinfectants like chlorine gas or ozone. Mix water with slaked li me and aluminum sulfate to form a gelatinous ma ss of aluminum hydroxide. Filter through sand and gravel to remove large particles. Aerate to remove unpleasant odors and to add a better flavor. 14 of 20 Stir slowly to clump together the aluminum hydroxide. 7 Reset Help Last