I have a GE GNE29GGKBB Refrigerator. I have a WR02X13684 Filter Manifold that I want to use to flush filters before I install them. I just received the manifold and noticed it has two water lines connected to it. One line has a red painted band and the other has a Blue one. I am assuming this has to do with unfiltered water entering and filtered water exiting. Can you tell me which is which since I know that filter water flow direction is important?