The thing to be aware of with decaf is that the chemicals used to remove the caffeine leave residues which are very bad for your health. The lone exception is the Swiss Water Process, but that uses huge amounts of water and is therefore quite expensive.
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"The preferred solvents have become dichloromethane and ethyl acetate because of the numerous health scares when using solvents such as benzene, chloroform, and trichloroethylene."