slime sludge growing inside my pre-sealed 200MM Eisbaer

Hello I noticed my 200mm Eisbaer has a white/translucent slime growing inside of it. I initially thought the coolant had a color, but I now believe this is a mold or some kind of sludge that is growing inside.

How can I clean this sludge? Any official recommendations please help.
I never opened this loop or modified it. This is how it came from the Alphacool factory. However I will now reuse the radiator for a bigger pump but I will need to clean this sludge.

The stuff on the outside is just dust.

sludge.jpg
 
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