... 2.free sample 3.good quality 4.low price food grade potash alum1.Specifications 2012 Potash alum for water treatment ... , easily soluble in water, its water solution appears acid,is would lose crystal water and become white powder on ... lined top-grade woven bag, or following your demands 4.Usages Food industry: food fermentation, vermicelli processing, salted aquatic products, food preservative and ...