> What's the difference between what you did and what I did? Also, I don't really understand what equilibrium phases does. My understanding is that it is used to model how the minerals act in water at equilibrium under certain conditions. What does the manual say about EQUILIBRIUM_PHASES? Do you know what saturation indices are? What are the differences between these three simulations? SOLUTION 1 EQUILIBRIUM_PHASES 1 Calcite 0 10 CO2(g) -2.0 10 END SOLUTION 2 EQUILIBRIUM_PHASES 2 Calcite -1 10 CO2(g) -2.0 10 END SOLUTION 3 EQUILIBRIUM_PHASES 3 Calcite 0 0 CO2(g) -2.0 10 END > Then, the final question is, after the sea water and ground water interaction have been taken care of, do I use equilibrium phases to add in the limestone aquifer interaction? Thank you again for your help! You tell me what you think and I'll comment. David David Parkhurst (dlpark@xxxxxxxx) U.S. Geological Survey Box 25046, MS 413 Denver Federal Center Denver, CO 80225 Project web page: https://wwwbrr.cr.usgs.gov/projects/GWC_coupled
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