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I used to think that WW was the bomb....I mean it was on dangerdens web site and numerous other watercooling e-tailers. So, I poured some into my exos. It worked great for like 6 months....but I really think it weakened the plastic because a barb on the resevoir brok off and I had stinky liquid everywhere. I would really just stick with the stuff they premix. If you don't want to order it, than there is some hydrex stuff that should be good. Other than that....maybe just some anti algae drops from innovatek.
I have used a 10% solution of Super Coolant plus a few drops of an algacide for the last 18 months or so in my EXOS I with no observed ill effect. YMMV
ive been using about 2 capfull of watter wetter with distilled water and had that in my rig with no ill effects for just over a year now hopefully that dosnt change or maybe i should just drain and go str8 distilled water ?