> I used example from your manual to do invers modeling. But the program still give me error about uncertanity . I noticed charge balance is high. The default units are mmol/kgw. I suspect that your data are a mixture of mg/L and ug/L. You need to define the units properly. 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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