Need an effective soil amendment to condition calcium-deficient soils? Solution Grade Gypsum 50lb bag is here to help! Formulated with 22% calcium and 17% sulfur, Valu-Fil 650 is a white, finely ground calcium sulfate dihydrate which is quickly and easily dissolved in water. With this high-purity solution, you'll see improved root development and healthier turfgrass. Here at AGC, Gypsum is our business, Custom is our creed. Get the results you want!