Natural soil food for lawns in alkaline and hard soil. Rapidly lowers soil pH. Helps loosen heavy, hard-packed soils and promotes air and water penetration for better rooting. Feeds and activates soil microbes and maximizes plant absorption of lawn food nutrients. Ideal to use with any lawn food or annual lawn program. Effective for 8 to 12 weeks based on environmental conditions. 18% calcium, 17% sulfur, 6% humic acid, 1% polyhydroxycarboxylic acids.