Food-Grade Propylene Glycol USP for use in the Grainfather GC4 Glycol Chiller, or any other glycol chiller. Dilute with distilled water to the ratio specified in the instructions for your chiller.
PLEASE NOTE: While Propylene Glycol is considered food grade this is not meant to suggest that it is safe for consumption. In case of consumption please contact your local Poison Control Center immediately.
Video Instructions for Grainfather GC4 Glycol Chiller: https://youtu.be/bT1hyU6H4UY