Natural soil food for lawns in acidic and hard soil. Rapidly rises 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. Effective for 8 to 12 weeks based on environmental conditions. Ideal to use with any lawn food or annual lawn program. 28% calcium, 1.5% sulfur, 0.5% iron, 1% humic acid, 1% polyhydroxycarboxylic acids, 2% biochar.