30 LB, Organic Lightning Lime, Covers 5,000 SQFT, Works In Just 6-8 Weeks, It Utilizes Pure Calcium Carbonate That Has Been Ground To An Ultra-Fine Powder Before It Is Pelletized, Enhanced With A Proprietary Combination Of Organic Humic & Fulvic Acids That Helps Convert Calcium Into An Immediately Available Form, Approved For Organic Gardening.