... alum 2.free sample 3.good quality 4.low price food grade potash alum1.Specifications 2012 Potash alum for water treatment 1 ... %Packing: 50kg 25kg plastic lined top-grade woven bag, or following your demands 4.Usages Food industry: food fermentation, vermicelli processing, salted aquatic ... used to prepare aluminum, paints, tanning, mordant, paper, waterproof agent. food grade potash alum