Ultra:Clear M 16/30 Mesh Made in USA, Food Grade Certified Ultra-Clear M effectively removes color bodies, surfactants, water, free fatty acids, organic oxides, and other polar contaminants from a wide range of oils, liquids, and waxes. It is the Second Largest particle size in the Ultra-Clear product line. UltraClear M is a unique, naturally occurring attapulgite that has been thermally processed to provide hard, durable granules that won't swell or breakdown in the presence of water. All Ultra-Clear products are classified as processing aids andhave Generally Recognized As Safe (GRAS) status from theFood and Drug Administration (FDA). At BVV we recommend 150g per lb. of biomass. We also use this media with layering techniques & can be used with BVV Silica Gel and BVV Neutral Activated Alumina for a sugar in the oven finish! Ultra-Clear is manufactured in 4 granule sizes, 8/16, 16/30, 30/60 & 60/90 mesh sizes. See the technical data sheet for more information from the manufacturer. Ultra:Clear M Food Grade Certificate Ultra:Clear M Technical Data Sheet Ultra:Clear M Safety Data Sheet