Galvanic corrosion. My first koolance system was dead in about three months. Haven't screwed with aluminum since (with the exception of two swiftech blocks, though the have been fine). I caught it before it ruined my system, though it could have. There was severe pitting and discoloration on the barbs of an old NB block where the gold plating hadn't taken. Only safe to assume it was happening elswhere.
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