TITLE Example 3, part A.--Calcite equilibrium at log Pco2 = -2.0 and 25C.        
SOLUTION 1  Pure water
        pH      7.0
        temp    25.0
EQUILIBRIUM_PHASES
        CO2(g)          -2.0    
        Calcite         0.0
SAVE solution 1
END
TITLE Example 3, part B.--Definition of seawater.
SOLUTION 2  Seawater
        units   ppm
        pH      8.22
        pe      8.451
        density 1.023
        temp    25.0
        Ca              412.3
        Mg              1291.8
        Na              10768.0
        K               399.1
        Si              4.28
        Cl              19353.0
        Alkalinity      141.682 as HCO3
        S(6)            2712.0
END
TITLE Example 3, part C.--Mix 70% groundwater, 30% seawater.
MIX 1
        1      0.7
        2      0.3
SAVE solution   3
END
TITLE Example 3, part D.--Equilibrate mixture with calcite and dolomite.
EQUILIBRIUM_PHASES 1
        Calcite         0.0
        Dolomite        0.0
USE solution 3
END
TITLE Example 3, part E.--Equilibrate mixture with calcite only.
EQUILIBRIUM_PHASES 2
        Calcite         0.0
USE solution 3
END