i use my own mix of liquid, now already for one year and it's still clear as hell my liquid.
i buy a bottle of 100% pure Ethylene Glycol (no color) and 100% H²O.
use a mix of 15% Glycol.
After 1 year didn't change it at all, still no green or anything else in my loop, and it runs 16hours a day my rig.
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