> 1- The Program always give me Error,[ it is impossible to balance solution with input uncertainties ] I used default uncertainties and tried to change it. Look at the charge balance for your solutions, it is printed out at the top of the distribution of species. Apparently, your solutions have > 10% charge imbalance. Check that the analyses are defined correctly and try to figure out what is the reason for the large imbalance. The uncertainty for inverse modeling must be greater than half of the percent charge imbalance error. > 2- Why program calculate SI from initial solution . It is supposed to calculate SI from final solution not from the initial [ as i have two solution only one initial and the other final] PHREEQC calculates a distribution of species and SI's for every solution defined in SOLUTION data blocks. It is necessary to calculate the total concentrations, charge balance, and alkalinity that is used in inverse modeling. 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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