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SO4 is finely ground gypsum that is mixed with a binder to form a pellet. SO4 has 21% calcium, 17.5% sulfur (in sulfate form) and is a 95% pure dihydrite gypsum. Dihydrite gypsum is soluble, whereas anhydrite is not soluble in the soil. If you are looking for a gypsum product for fields or turf, you are looking for dihydrite gypsum or SO4.
