50 lb pail of usp pure sodium bicarbonate powder highest quality organic food grade ormi listed pure baking soda duda energy sodium bicarbonate powder / baking soda food grade, usp by duda energy baking soda (sodium bicarbonate) nahco3 not just baking soda. quality baking soda. cas: 13-347 99+% purity specification (typically 100% pure) meets usp specifications aresenic: 0 ppm calcium: ~62 ppm chloride: less than 150ppm heavy metals: less than 5 ppm iron: ~0.75 ppm loss on drying: maximum 0.25% magnesium: ~25 ppm powder form, typical particle size: 44 micron. maximum allowed particle size: 149 micron. particle size specifications +100 mesh (149 micron): 0.0% - 2.0% +170 mesh (88 micron): remaining % +200 mesh (74 micron): 20.0% - 45.0% +325 mesh (44 micron): 60.0% - 100.0% derived from naturally occuring trona. no preservatives, colors, vitamins or additives of any kind are added to this product. contains only trace naturally occuring mineral content. certified with the organic materials review institute (ormi).