### Pollutant removal (treatment) - Setting a constant concentration as the result of the treatment expression

Hello there, I am trying to set a constant outflow concentration as the result for a treatment-equation, i.e. BOD: C=50.Unfortunately, setting a constant value for the concentration does not work, the result of the effluent concentration would be just the same. However, I want the concentration to be exactly the value I selected in the treatment-expression. Moreover, it seems like every treament-expression with C=... leads to invalid results... What can I do to fix this? Defining an additional inflow at the correspondent node is not sufficient, as my flow should not change. Furthermore, I am trying to implement an equation where a pollutant stands in the exponent of a equation, i.e. HRT^(0.75*TSS). With this expression, I would get an error when trying to simulate (invalid expression). Is it not possible to use this kind of expression? What else can I do to solve this issue? Kind regards (from Germany) Robert

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