... 20% Min 2. Water-soluble (P2O5): 18% Min 3. Free acid: 5.5% Max Single super phosphate fertilizer(SSP)Detailed Specifications ... :ItemsRangeTotal P2O520 % MinWater-soluble phosphate (P2O5)18 % MinFree acid ... in fertilizer production and export business.Main products : Prilled Urea, Granular Urea, TSP, DAP, MAP, SOA, NPK, etc ...