TCS SUL XC Enriched Gypsum is a homogenous product consisting of pelletized gypsum and 100% soluble Humic Acids. Pelletized Gypsum (calcium sulfate) provides sulfur and calcium in the sulfate form which solubilizes steadily making it available to the soil and plant roots. Since Gypsum is a neutral salt it is not a liming agent and has very little effect on soil pH but can used to improve soil structure.