TITLE Titrate TS-3 with calcite
 SOLUTION 1  TS-3
         pH       3.8
         unit     mg/l
         temp    16.0
         Na     389.    charge
         K       60.
         Ca     310.
         Mg    1000.
         Cl     550.
         C(4)     5.
         S(6) 16500.
         Fe(3) 1950.
         Al    1020.
         Mn(2)   66.3
         Si      40.5
 EQUILIBRIUM_PHASES 1
         Gibbsite       0.0  0.0
         Fe(OH)3(a)     0.0  0.0
         calcite        0.0  0.0
         gypsum         0.0  0.0
         CO2(g)
 REACTION 1 Add calcite to the acid groundwater
         Calcite      1.0
         0.25    moles in 20 steps
 SELECTED_OUTPUT
         -file   ts3.pun
         -a     H+
         -si calcite
         -equilibrium_phases  gypsum Fe(OH)3(a) gibbsite
 END