All models must contain a Reference Fluid. For convenience, the Reference Fluid is automatically provided in the Material Container, which is created in the Model Root whenever you create a new file with the Contaminant Transport Module. The default name for the Reference Fluid is "Water". If desired, you can move or rename this element, but you cannot delete it.
You cannot insert or create copies of the Reference Fluid (i.e., each model must have a single unique Reference Fluid), but in order to represent spatial variability of fluid properties, you can create clones of the Reference Fluid.
The editing dialog for the Reference Fluid is shown below:
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