Calcium Carbonate, 2 oz. Email to a Friend $1.69 Qty: Add to Cart OR Add to Wishlist | Add to Compare Product Description Powdered chalk used to increase the pH of brewing water. Allows the brewing of darker beers with highly acidic water. 2 oz. jar. Double click on the above image to view full-sized. Reviews and Tags Product Tags Product Tags Add Tags: (what is this?) Add Tags Use spaces to separate tags. Use single quotes (‘) for phrases. Product Reviews Be the first to review this product My Cart You have no items in your shopping cart. Recently Viewed Products Ascorbic Acid Citric Acid, 8 oz.