Spent Grounds is our retail Roastery so is affiliated with U-Roast-It Coffee.Swiss Water Process uses the elements of water, temperature and time to decaffeinate coffee. They introduce Green Coffee Extract (GCE) to the beans. The caffeine comes out and moves away from the coffee beans and into the GCE. The caffeine gets trapped in the carbon filters and is separated from the GCE. The GCE is then refreshed and can be used again to remove more caffeine. 99.9% of the caffeine is removed.