Gypsum granular for golf course calcium sulfate . packing: 25kg/bag. laoding: 20tons/20fcl . specifications. caso4 2h2o>95%. ca2+>20%. so4 2->50% Phusion calcium sulfate is a pelletized calcium sulfate that is reacted with an organic acid. this unique organic acid is a combination of calcium lignosulfonate and lignosulfonic acid. phusion calcium sulfate releases calcium dramatically faster than non-reacted gypsum, which means that it In the rare event that calcium is recommended for turfgrass growing in soil with an adequate ph, gypsum can be used as a source of calcium. keep in mind that gypsum is not a liming source. also, despite claims on some gypsum labels, it will not relieve soil compaction or break up clay soils in the northeastern united states. So4 pelletized gypsum supplies a strong initial release of sulfur followed by a steady supply throughout the growing season, delivering the right of amount of sulfur to perfectly match plant needs for yield-maximizing plant growth. so4 is mined and manufactured in northwest iowa from one of the purest gypsum sources in the world.