Our model is suitable for predicting the phase coexistence far from the critical point. However, it cannot correctly describe the critical region because it assumes that no polymer is present in the supernatant phase. In accordance with the literature, our simulations predict that the stability window of the PEC phase shrinks as the salt concentration is increased. Furthermore, they predict that the partition coefficients of monovalent ions are slightly below unity, indicating a slight preference for the supernatant phase. Unlike monovalent ions, divalent ions strongly prefer the PEC phase, resulting in partition coefficients on the order of ten. These results semi-quantitatively agree with our own experiments and also with other experiments from the literature.