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Hello !!!!! I am making a simulation of a tracer test with three injection wells (north) and one pumping well (south). On the injection wells we have injected the salt and water for 16 hours and then successively water for two months. After 16 hours of injection (the initial concentration was 330g/l), we started to pump almost the same amount of water injected on the north on the same time span. we have found the Kx values that match the arrival times of the breakthrough curve at the observation points, according to the pathlines. The problem is that I am getting Nacl concentrations that are too high compared with the values I have measured (calculated from the electric conductivity at the observation point converted in Nacl concentration). The aquifer thickness is about 30 meters. My question is, according to the above mentioned; is there any way to reduce the concentration at the observation well (40 meters downgradient of the injection well). There should be no adsorption or other phenomena within the aquifer, or at least we expect that. The concentrations should be around 10mg/l, however, the concentrations I am getting are around 1800mg/L * could it be possible to use double density approach to solve that problem? * RT3D gave me better results than MT3D, setting in both cases NO reaction (tracer transport), but setting in the CHEMICAL REACTION PACKAGE A value for the Linear isotherm a first sorption value of 1e-3, could that value influence a lot? Thanks a lot for your reply and possible suggestions Alexxander