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Which version of the GWB is right for you? The chart below shows the programs and features included with each:

Program Pro Std Ess
GSS GSS is a spreadsheet for manipulating and plotting geochemical datasets
Rxn Rxn balances chemical reactions, calculates equilibrium constants, and more
Act2 Act2 generates stability diagrams on activity, Eh, pe, pH, and fugacity axes
Tact Tact makes temperature-activity and temperature-fugacity diagrams
SpecE8 SpecE8 figures concentrations of aqueous and sorbed species, saturation, and gas fugacity
Gtplot Gtplot displays data from GSS and the results of running SpecE8 and React
TEdit TEdit is a graphical application for quickly and accurately editing and combining thermodynamic datasets
React React traces reaction paths involving fluids, minerals, gases, and microbes  
X1t X1t models reactive transport in groundwater flows in one linear, radial, or spherical coordinate    
X2t X2t simulates reactive transport in two dimensions, including injecting and producing wells    
Xtplot Xtplot renders and animates the results of X1t and X2t simulations    

Feature Pro Std Ess
Spreadsheet for geochemical data
Convert chemical units
Time series, cross, and ternary plots
Piper, Stiff, Durov, Schoeller diagrams
Configure Stiff, Schoeller, and Radial diagrams from user interface
Multiple Stiff, Schoeller, Radial, Bar, and Pie plots per page
Show TDS as circles of varying radius on Piper, other plots
Ion balance bar and pie charts
Flag non-compliance
Calculate mineral saturation and gas fugacity
Mix samples
Compare replicates and check standards
Calculate redox state
Check charge balance
Compute TDS
Eh-pH, activity, and fugacity diagrams
Temperature-activity and temperature-fugacity diagrams
Solubility diagrams
Mosaic (ligand speciation) diagrams
Calculate species’ concentration and activity coefficients
Redox equilibrium and disequilibrium
Use “Pitzer equations” to compute activity coefficients
Sorption by Kd, Freundlich, and Langmuir models
Calculate electrical conductivity by USGS and APHA methods
Ion exchange
Two-layer surface complexation model
Gas and mineral buffering; pH-stat
Balance chemical reactions
Compute equilibrium constants (log Ks) at temperature
Derive equilibrium equations, temperatures
Set line colors individually on x-y plots
Paste graphs into Word, PowerPoint, Excel, Adobe Illustrator
Choose 32 bit or even faster 64 bit version
Option to automatically install maintenance releases
Edit and combine thermodynamic datasets
Create and edit datasets of surface reactions
Flexible redox pivoting in thermodynamic datasets
Dashboard keeps all your tools in one place
Save graphics as eps, pdf, ai, png, emf, svg, and bmp files
Plug-in to other programs
Control scripts and batch processing
Edit thermo and surface datasets in legacy formats
Model water-rock interaction  
Simulate fluid mixing  
Speciation diagrams vs. pH, etc.  
Closed and open chemical systems  
Polythermal simulations  
Fixed and sliding activity, fugacity  
Combine equilibrium and kinetic reactions  
Kinetics of mineral precipitation and dissolution  
Aqueous complexation and dissociation kinetics  
Sorption and desorption kinetics  
Kinetics of redox transformation  
Enzymes and catalysts  
Gas transfer kinetics  
Microbial catalysis and growth  
Mixed microbial communities  
Thermodynamic constraint on microbial metabolism  
Specify form of kinetic rate laws  
Chain together kinetic reaction paths  
Turbo scripting speeds rate law evaluation  
Transient medium and fluid properties  
Account for heat sources and sinks  
Report factors limiting time steps  
Paste any plot into Excel as numerical data  
Reactive and bioreactive transport    
Multithreaded (parallel execution on multicore chips)    
Advection, dispersion, and diffusion    
Uniform or heterogeneous medium    
Dual porosity (stagnant zones)    
Advective and conductive heat transfer    
Colloidal transport    
Any number of boundary, injection fluids    
Unlimited number of reaction intervals    
Turn wells off and on, vary pumping rates    
Recirculation wells    
Import flow fields    
Linear, radial, and spherical coordinates in 1-D    
Rectilinear and axisymmetric coordinates in 2-D    
Regular and adaptive grids    
Map view, color mask, and contour plots    
Animation and output for video    
Quick video output to compact frame images