The available solution methods of Moller and TAPPI are only recommended for use in the range of 0.9 - 6 % (Moller) and 2 - 6 % (TAPPI). When operating outside this range, the solution methods may lose accuracy.
It's important to note that the solver will calculate the model outside this recommended range though, we need to be careful with the results owing to the accuracy of the methods. A warning message will be enunciated when operating outside this range.
As a side note, when changing the value for "Wt% oven dry concentration" at an inlet boundary node, please ensure that after you have changed the value, you click in another cell on the Data Palette to complete the change of data-entry. You can then calculate the model.