The process begins with pure water and ends with amazing coffee that is 99.9% caffeine free. The difficulty to decaffeination is that many of the flavor compounds that give coffee it excellent taste are, like caffeine, water soluble. Thus, any decaffeination method needs to single out and remove the caffeine molecule, while preserving as many of the flavor compounds as possible.
The Swiss Water Process (SWP) is a non-solvent method for decaffeinating unroasted coffee beans. The mixture produce by soaking the green coffee beans in water to remove the caffeine, called the green coffee extract (GCE), results in a free of added chemicals and also caffeine free, being processed using the cleanest water possible.