20 LB, 10,000 SQFT Coverage, High Quality Pelletized Sulfur Combined With Patented Ast Polymer Formulation, Lowers pH In High Alkaline Soil, Releasing Existing Nutrients & Fertilizers So They May Be Taken Up By The Roots To Feed The Plants, Excellent For Acid Loving Plants Such As Azaleas & Rhododendrons, Changes The Electrical Charge In The Soil Creating A Positive/Negative Attraction Between Soil & Nutrients & Sulfur & Nutrients Bind To The Soil So That Rain & Sprinklers Do Not Flush Nutrients Through The Soil, Maximizes The Efficiency & Use Of The Sulfur, Prevents Environmentally Damaging Fertilizer Run Off.