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Originally Posted by JamesAvery22
andy497,
I ran bare aluminum and copper in a loop with the recommended mix of hydrx for almost a year, worked fine.
I use distilled/af/and iodine now just because of the price though =\
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Beware of precipitated iodine. I am not a chemist, but I believe you could form iodine salts that precipitate out. Any solids will void a pump warranty because it's like sand in your shorts (good abrasive).
Instead of a biocide, I prefer keeping my loop hidden (no bling for me) from light, and just regularly perform a coolant flush.