Earth Science 25 Lb. 5,000 Sq.Ft. Coverage Fast Acting Sulfur Is A High-Quality Sulfur That Naturally Adds Essential Elements Back Into The Soil, Loweings The Ph In Alkaline Soil, allowing Existing Nutrients And Fertilizers to be better Taken Up By Plants. It Is Excellent For Acid-Loving Plants Such As Azaleas, Rhododendrons, And Berries. It Features Nutri-Bond Technology Which Holds Nutrients In Place For Maximum Effectiveness And Reduction Of Nutrient Runoff. It Contains A Rich Source Of Calcium Essential For Plants To Better Take In Nutrients. The Exclusive Fast Acting Formula Starts Working Immediately. One Bag Of Earth Science Fast Acting Sulfur Does The Work Of 4 Bags Of Agricultural Sulfur.