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We use tonnes of monopropylene glycol as a secondary refrigerant in the food industry which means it flows through heat exchangers and machines that are within the production areas although not in direct food contact and its considered as "not classified as hazardous" by the manufacturers and supplier which meets the HSE requirements, obviously this is against humans not animals although the MSDS say minimal effect on aquatic life, but I still wouldn't drink it. Mark

Just to the rad sides Mark