[V12|V12]

Jet-dry (or equivalent) in *very small* quantities should do its work without foaming too much.

Very Small meaning, seriously, like LESS than a drop! I made a 1:7 mixture of Water+Anti-Freeze which totalled about 64oz, added 1 drop then filled my system with the mix, which holds about ~32oz maybe a little less and with in hours there was foam starting to arise! I don't have ANY 90°bends and a very non flow restrictive block, no matter what I did, even flushed the WHOLE system out with a new mix and the bubbles just kept coming back... The stuff doesn't like heat I take it; when things were very cool, like on standby, the bubbles would slightly subside, or interestingly enough, when I would add a small amount of Anti-freeze ~10ml, the bubbles would again subside, but would eventually return. Right now I'm using the same 1:7 mix, but with about 1/4 drop of Jet-Dry... The benefits of using it and messing up a nice batch of mix+having to flush your system, don't seem worth it to me. I just use a more concentrated mix of H2o+Anti-F ~1:5, yes adding more anti-F does reduce thermal efficiency, but it's NOT that much if, hardly noticeable, besides, you'll have a more bacterial-resistant system that won't need all the flushing etc... at the suffice of .5C at most...?