Intrepid Trio is 100% natural langbeinite, a unique mineral with three essential nutrients in every granule. Trio provides a long-lasting, readily available source of low-chloride potassium, magnesium and sulfur ideal for fruit, vegetable and row crops grown in magnesium-deficient soils. Trio is certified Safe Feed/Safe Food. This product is granular for easy broadcast application. Readily available 21% S, 22% K and 11% Mg.