Hydromantis GPS-X v6.5 GPS-X is the most advanced tool available for the mathematical modeling, simulation, optimization and management of wastewater treatment plants. The user-friendly drag and drop interface and comprehensive database of unit processes allows users to quickly and easily assemble a treatment plant model, enter characterization data, and run simulations. Develop and optimize advanced control schemes, predict effluent quality under varying conditions, conduct planning and capacity analysis or offer sophisticated training and development programs with a dynamic model of your actual or proposed plant. GPS-X was the first commercially released dynamic wastewater treatment plant simulator and still remains the solution of choice today. Open Modelling Platform, with Open-Source Models Open Source The GPS-X simulation environment allows users to write/edit/change models, via the ACSL programming language. Add any new calculations/algorithms/variables to your model layout. Advanced tools such as Model Developer allow for easy biological model manipulation in matrix format. All GPS-X input and output menus, as well as the new simulation result summaries, can be edited and customized by the user.