I think there are significant differences between compound baking soda and edible baking soda in composition and use. Compound baking soda contains sodium bicarbonate, corn starch and alum, which is widely used. Edible baking soda is mainly sodium bicarbonate. In use, compound baking soda is mainly used as leavening agent for pasta, biscuits and other foods to improve the taste; Edible baking soda is used for cleaning and decontamination, because its alkalinity can effectively remove grease and odor. It is very important to choose the right type of baking soda according to the demand.