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Solution Keyword and Aqueous Species

I need to use as PHREEQC input some output from another geochemical code.
The problem is that I can only use concentrations that are given in terms
of a few individual aqueous species, i.e., Ca++ instead of Ca total or
SO4-- instead of S. Is there a simple way to use that kind of data as an
input apart from picking some larger number for total Ca... and iterate
until Ca++..... concentrations in PHREEQC output matches my input?

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