About Swiss Water Decaf Coffee Love the taste of coffee but want to do without the caffeine? Swiss Water decaf coffee from Peru is a unique selection that uses high quality green coffee beans. The Swiss Water method includes soaking coffee beans in fresh water and rehydrating them to achieve decaffeination. Not only does this method remove caffeine, it also removes unwanted dirt and debris from the beans as well. This cutting edge decaf method removes up to 99.9% of caffeine from coffee without destroying the taste of Peruvian coffee beans in the process.