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Hi, I am trying Xt2 to simulate a field experiment that my group conducted in the “Anderson” well gallery at the Rifle, CO site to created a bioactive zone using recirculation wells. In the experiment, water was pumped from a production well (M-07) and amended with urea and molasses using a metering pump and an in line pipe-mixer for 12 days and reinjected (well M-02) up-gradient. The pumping well was shut off and the reactive zone was monitored for 400+ days. I understand how to create the recirculation cell in Xt2 (GWB12), but I am struggling with an approach to add the urea and molasses to the injected water. Can two fluids be injected simultaneously into a single well? Or should I look for another approach such as creating a fictive solid placed in the grid block with the well with a defined, constant release rate? Any insights would be welcome. In addition, the Goldschmidt Reactive Transport Workshop was great. Thanks Bob Smith