Our decaf coffees are decaffeinated using the "natural water process". Our half caff coffees are a 50/50 blend of a regular coffee and a decaf coffee of the same roast style. Here's a little more about the decaffeination process that our beans undergo:
The beans are cleaned and soaked in water partially saturated with coffee flavor solids in order to bring the flavor of the beans and the water into equilibrium. They are then immersed in the flavor-charged water, where only the caffeine - because it is not in equilibrium with the water - diffuses from the beans into the water, leaving the flavor intact. The flow of water passes through a carbon filter that traps caffeine. The 99.9% caffeine free water then makes its way back to the beans.