Not to resurrect an old thread, but

I just looked at my res today and notice white stringy flakes in it. I flushed the cooling system completely couple of weeks ago as I was adding evga gtx 580 hydrocopper 2 to my system. I am using fesser one clear UV coolant, been using it for over a year before. Not sure what those flakes are... As far as I know evga uses swiftech waterblock for their gtx 580s. Is there a chance of a reaction between new card and my cpu waterblock Heatkiller 3.0? Or my rads? Algae growth?
I am afraid that I would need to disassemble my new gtx 580 to clean it now, is there a way to flush it??? Should I just refill it after I flush it with same fesser one fluid?