Jonathan Green 11353 MAG-I-CAL Pelletized Calcium Fertilizer, 5000 Sq. Ft.MAG I CAL for Acidic Soil is a highly soluble form of calcium that helps to rapidly raise your soils pH, improving the health of your lawn by releasing trapped nutrients in the soil that feed the grass plants. MAG I CAL can be applied anytime during the growing season. 18 lbs 5,000 sq. ft. coverage Rapidly raises Soil pH MAG I CAL natural soil food for lawns in acidic soils A highly soluble form of calcium which is readily available for plant uptake