Sproket: I had a similar thing happen to my setup. I put in my pink coolant when I built it (distilled water + water wetter), and after 3 or 4 weeks my coolant was clear again (and the Tygon was still clear too). I figured that since the water-wetter should be forming a protective layer on all the metal and that since I have a very small volume of coolant (no res) that I somehow used it all up, so I put in a bit more pure water-wetter. Now (about 1 year later, coolant has never been changed, just topped up) the coolant is a browner shade of pink, but still not really brown either. Without draining it I have no way to know if the Tygon is actually stained, but I should find out in the next month or two when I rebuild/upgrade, and if this thread is still alive then I will update.
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