its called neoprene tubing.
http://www.sidewindercomputers.com/tyano1id3odi.html
I Honestly think you guys are hoping too much.
The greater the delta from ambient air -> coolant temp, you'll see better benifits with a heavier water.
However when your coolant is already kept within a very low delta of ambient air, then you guys are just hoping for too much.
Remember this is ambient cooling, you can only go as low as ambient.
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