Ok, got my watercooling rig, have talked about it before, but now I have a seperate problem. I've been using a 50/50 mix of antifreeze and distilled water *Prestone ready fill, comes pre-mixed*. Well, I just took a peak into my res today, and saw some gunk growing on the top of the res. At first I thought it was water vapor, so I shook the case. Bad move. I saw this stuff tear off in chunks and fly through my watercooling. Now my temps are up, Im pretty sure this stuff is stuck in my radiator or pump somewhere causing flow problems. But what was it?? I know of no additives that were in the system that would cause that. The soda bottle I used to fill the system was washed 3 times and rinse-washed with the antifreeze twice before I used it *yes, two years of college chemistry here, I know how to prep a container*. I was not using anything else in my system and last time I drained it I cleaned out all the parts. So what gives??