Quote Originally Posted by MpG View Post
The Utopia stuff fades within a few months anyway, and the colours are no better than any other option, really. That said, I've never seen crap like that in my experience, so maybe it was past it's shelf life. Or the dye managed to react badly. Not impossible, despite manufacturers claims.

If you want colour, coloured tubing really is the way to go these days.
+1

I also would recommend the colored tubing, and running plain distilled with some biocide and possilby anti-corrosion additive just for safety. This will even improve the performance of your loop.