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Hello Evans, I just want to clarify my previous post and provide more information on redox couples in GSS. The selection of either a basis or redox species also specifies whether redox equilibrium or disequilibrium model is used for calculations in species distribution. If you select the basis species (e.g. Fe++ in thermo.tdat), the redox couple for Fe2+/Fe3+ is automatically enabled unless you manually disable it in Redox Couples dialog. If you include a constraint on the oxidation state, such as Eh, pe, or O2(aq), then the program will figure the distribution of mass from the total you