In addition to phosphate rock, we also determined the ability of bacterial spent media in solubilizing P from FePO4 (Table 1). Unlike phosphate rock, spent media from all 7 bacteria solubilized P from FePO4. Bacterial strain PG10 solubilized the least amount of P at 3.38 mg L−1 and PG12 the most P at 9.05 mg L−1 (Table 1). For example, PG12 solubilized 3.8-fold more P from FePO4 than phosphate rock (Table 1).