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Enter "Brewer" and they give 20% off on gallons. So that's $55 or so for 2 gallons. http://www.chemworld.com/ChemWorld-Propylene-Glycol-p/chemworld-pg-1.htm
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What percentage of propylene glycol to water ratio does anyone recommend in tapper lines and chillers? 20, 30, 40, or 50%