20 Microns produces a range of Calcium Carbonates of different Brightness and Particle Sizes. Our Super With High purity calcium carbonates are micronized and are closely controlled to offer uniform particle size, this Natural Calcium Carbonate is produced from the finest quality resources procured Domestically and Internationally. Upgrade your formulas with our sub-micron calcium carbonate and see a noticeable difference in product quality. For more information:https://www.20microns.com/products/product_detail/calcium-carbonate/82