GINSBURG FISH RINGERS

6.50 g NaCl
0.25 g KCl
0.30 g CaCl2 (0.4 g CaCl2⋅2H2O)
Add ddH2O to almost 1 liter
0.20 g NaHCO3
Add ddH2O to 1 liter

Note: The order of addition is important to prevent precipitation