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I apologize in advance: I am far from familiar with GWB. The mix I'm trying to model is supersaturated in several Ca phosphate phases. Fluid A & B seem to equilibrate ok independently, but using pickup>reactants>Fluid A to react with Fluid B is not working for me. The popup-error seems to suggest the components need to be the same on both solutions -not sure if this is the case-. Modeling the solution as a single event is confusing because it looks like I can't choose CO3--, CH3COOH- and H+ simultaneously. (I am also confused by the requirement of equilibration with O2 for only 1 of the 2 fluids above.) Loading the fluid scripts one after the other and then running the equilibration, produces results albeit including several warnings of charge imbalance (which I expect) and the elimination of CO3-- from the basis; I am not sure this represents the mix I want. I haven't considered modifications to the default activities calculation, but this may be important for this example. Input is appreciated! MC FluidA.rea FluidB.rea