it always appeared in my koolance system that used alu parts. My all out watercooling rig has all copper parts and it runs straight water with no addatives. The watter stays clean and fresh for a long time. Doesn't even smell bad. So most likely u just have gunk coming off of your metal parts.
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ABIT IT-7 MAX
P4 2.26B@3.01 1.7v 180fsb
Corsair (samsung) PC3200 C2
Radeon 9700Pro 3Dmark2k 16606
(384/350)
http://service.madonion.com/compare?2k1=4474405
60gig WD7200
H20> Maze 3, heater core, GeF4 on ATI, Via Aqua1300
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