Total P2O5:18-28%min. CaO:35%min.K2O: 0.1%min. AL2O3: 1%min. H2O: 5% max. 2mm-4mm powder form and granular form , 95% pas s 1.There is only ever been one problem associated with Soft R ock and it is related to the release time of the product. Ph ospha