Thanks, using tap water with colorant could have some effects. Tap water is cleaned/disinfected with chlorine or ozone, both gases are strong bleachers. And sometimes you can taste minimal deposits of them.
Replacing the old color (since it was red) only with distilled water might be enough, since the new color is red too. With the tap water session I had in mind to remove the color completely. But in this case it might be more important to remove the solvent completely.
In any case, try to make the circuit empty before filling with the new fluid. Take care that the pump never runs dry.
Walmart (or any other) distilled water is not distilled. They are demineralized but not distilled. Distilled water (which has the name by right) is expensive (energy use and time to control). During my laboratory time I could make any distilled fluid. Distilled water together with distilled Isopropanol was used for cleaning vinyl records. But that’s of topic.
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