Oren's Coffee NYC says:

Our Colombian is five grades higher than a standard 100% Colombian coffee, providing exceptional quality and flavor. This is a fine, delicate and incredibly popular standard decaf. We use the Swiss Water Process (SWP) to decaffeinate our coffees. This process is free of the chemicals that many commercial coffee producers use. All it requires is water, a carbon filter, temperature and time to make our signature coffees 99% caffeine free. In addition to being eco-friendly, it also maintains the original flavors of the coffee bean. We wouldn’t have it any other way.