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In newer beer chilling systems a cold liquid is passed along tubes to a chiller plate (cast aluminium) acting as a heat exchanger, and then through the tap system (font) to keep the beer cold. The beer passes through tubes inside this chiller plate and becomes cold.

The liquid is made cold in a tank with refrigeration coils imersed in it, operated by a refrigeration unit.

The beer lines are wrapped together with the chilled liquid tubes in an insulation, called a python. The chilled liquid also causes condensation to form on the outside of the beer font.

GLYCOL is used as anti-freeze in a car radiator, as it lowers the freezing point of water.

By using GLYCOL as the chilled liquid the temperature can be lowered below zero degrees celcius making for a colder beer, and causing the condensation to form as ICE on the font.

The beer is not normally served below one degree celcius. No beer will freeze at temps above minus one degree celcius, and freezing point is determined by alcohol content. Importantly, the Glycol never actually comes in contact with the beer.

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