... gray-white c.moisture:5%max d.size:1-4mm calcium superphosphate 1,Detailed Product Description: ItemspecificationStatepowderTotal P2O5 36%(16%,18 ... essential components are soluble monocalcium phosphate [(H2PO4)2·H2O] and calcium sulfate [Ca SO4·2H2O]. The available P2O5 in the ... product also contains 3.5%~5.5% free phosphorous acid, calcium, iron, magnesium, silicon, sulfur, etc, and indeed is a ...