Decafé – 10 Nespresso Cups
A load of unroasted coffee beans is soaked in hot water, releasing the caffeine. This process is carried out until all the caffeine and coffee ingredients are absorbed into the water. The beans are then collected and disposed of. The water is pumped through a carbon filter that traps the caffeine molecules but allows the other constituents to pass through. The flavored water is then put back into a tank with new coffee beans. Because the water is saturated with the coffee flavors, this time only the caffeine is absorbed. This method is repeated until 99.9% of the caffeine is removed.
There is also a variant in which the caffeine is removed from the beans using a chemical process.