Talking to my biology teacher he says, and its proven that Anti-freeze does not help water cool any better. If you want the best cooling performane in ur h20 system use a couple drops of water wetter and pure iodinized water. Anti-freeze should only be used it very cold temperatures. Water has Polarity which means it is very resistant to temperature changes. Anti-Freeze however only kicks in till the water's polarity doesnt help like lets say 10C or lower. If ur sysem is runnign that low then i recomend using anti-freeze, if not use pure h20 .