what metals are the rest of the cooling system made of. if the are not all aluminum then what you are seeing is most likely a battery effect.(different metals reacting to each other)
if that is not the case, then you have something in your water that is causing the buildup. most likely it is what is called "hard water" that means that you have alot of minerals and metals in the water. get a new res and fill the system with Distilled water and water whetter. that should help alot.
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if its dead and edible i can cook it!!
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