I'm a chemist.  For my benefit can you please supply the composition of the broth, in particular the components containing phosphate

Thanks Paul. The ingredients are as follows (per liter): 

Glucose                       10.0 g

MgCl2•6H2O                 5.0 g

MgSO4•7H2O              0.25 g

KCl                               0.2 g

(NH4)2SO4                     0.1 g

Ca3(PO4)2                      3.8 g

FePO4                           0.1 g

AlPO4                           0.1 g

Thanks Paul. The ingredients are as follows (per liter): 

Glucose                       10.0 g

MgCl2•6H2O                 5.0 g

MgSO4•7H2O              0.25 g

KCl                               0.2 g

(NH4)2SO4                     0.1 g

Ca3(PO4)2                      3.8 g

FePO4                           0.1 g

AlPO4                           0.1 g

Thanks Paul. The ingredients are as follows (per liter): 

Glucose                       10.0 g

MgCl2•6H2O                 5.0 g

MgSO4•7H2O              0.25 g

KCl                               0.2 g

(NH4)2SO4                     0.1 g

Ca3(PO4)2                      3.8 g

FePO4                           0.1 g

AlPO4                           0.1 g

Thanks Paul. The ingredients are as follows (per liter): 

Glucose                       10.0 g

MgCl2•6H2O                 5.0 g

MgSO4•7H2O              0.25 g

KCl                               0.2 g

(NH4)2SO4                     0.1 g

Ca3(PO4)2                      3.8 g

FePO4                           0.1 g

AlPO4                           0.1 g