Most types of carbon have the same characteristics. 1.8 to 2 litres is sufficient for 4-5 litres of 40% spirit. Some brands can purify double this amount. THE BEST purifying method is by filtering through a carbon layer through a long tube. The tube usually takes about 2 litres of activated carbon.
Sometimes purification is not perfect. Filtering again with new carbon will give brilliant results. The new carbon will retain most of its absorption ability and can be used as the first filter for the next distillation. This method costs only one portion of carbon.
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