Pumice is 100% organic with over 70 different trace minerals and vitamins vital for plant growth and strong soil. Pumice is a pyroclastic stone rich in silica, made from the initial blast from a volcano that cooled quickly. Pumice is 65-85% porosity for superior soil aeration that stands the test of time compared to perlite, especially great for living soil. It helps loosen heavy soils, reduce compaction and improve aeration. Pumice absorbs water, micronutrients, and microbiology, and releases it when needed by the plants.