Recipe

 1.Dissolve the following in 850ml of distilled water

 24g NaCl

 11g MgCl2-6H2O

 4g Na2SO4

 2g CaCl2-6H2O

 0.7g KCl

 0.1g KBr

 0.03g H3BO3

 0.005g NaSiO3-9H2O

 0.04g SrCl2-6H2O

 0.003g NaF

 0.002g NH4NO3

 0.001g Fe3PO4-4H2O

2.Adjust pH to 7.8

3.Bring to 1000ml with distilled water

4.Autoclave or filter sterilize