Settings for the Aspen property method

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The topic of the graduation project is seawater desalination using waste heat from flue gas. Here are some parameters: Cold fluid in: 25% NaCl, at 25 degrees Celsius, in liquid form; Cold fluid out: water vapor, at 40 degrees Celsius, in gaseous form. The hot fluid is flue gas, with components of 75% N2, 8% NO2, and 17% O2. The inlet temperature of the hot fluid is 404 degrees Celsius. The property calculations for the cold fluid are carried out using ELECNRTL, while those for the hot fluid are done using PR. It was found that if PR is used for the properties of the hot side, the values still appear in red； But if ELECNRTL is selected, it turns blue – is that because an ionic solution has been specified in the composition? Are ionic solutions just substances used in cold measurements, and do they also affect the overall physical properties? How to set the property method for hot-side flue gas? Should I use the gray vaporEOS below, or make the settings within block options?