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PHAST Is a computer program for simulating groundwater flow, solute transport, and multicomponent geochemical reactions. It uses PhreeqcRM (Parkhurst and Wissmeier, 2015) for the reaction engine.
Parkhurst, D.L., Kipp, K.L., Engesgaard, Peter, and Charlton, S.R., 2004, PHAST—A program for simulating ground-water flow, solute transport, and multicomponent geochemical reactions: U.S. Geological Survey Techniques and Methods 6–A8, 154 p., https://doi.org/10.3133/tm6A8
Parkhurst, D.L., Kipp, K.L., and Charlton, S.R., 2010, PHAST Version 2—A program for simulating groundwater flow, solute transport, and multicomponent geochemical reactions: U.S. Geological Survey Techniques and Methods 6–A35, 235 p., https://doi.org/10.3133/tm6A35