SUPER FAST SHIPPING !!Organic Gypsum Powder Calcium Sulfate Fertilizer Solution Grade OMRI Listed. Sold in lots of 1/2 -20 lbs choose at top. Gypsum is calcium sulfate, a naturally occurring mineral. It has been touted as beneficial for breaking up compact soil, especially clay soil. It is useful in changing the soil structure of excessively heavy soils which have been impacted by heavy traffic, flooding, overcropping, or simply overly weatherized. One of the main uses of gypsum is to remove excess sodium from the soil and adding calcium. A soil analysis is helpful in determining if you need to apply gypsum as a soil amendment. Additional benefits are a reduction in crusting, improved water run-off and erosion control, assisting in seedling emergence, more workable soils, and better percolation. However, the effects will only last a couple of months before the soil reverts to its original state. Source of calcium and sulfur for plant nutrition. Improves acid soils and treats aluminum toxicity. Improves soil structure. Improves water infiltration. Helps reduce runoff and erosion.If for any reason our customers are unsatisfied We Guarantee your money back.We pack carefully and ship same day when possible. FAST FREE SHIPPING in the Continental US.We respect pandemic guidelines and take care preparing packages accordingly