Masterton’s Coffee only stock Decaf Coffee that has been decaffeinated using the CO2 process. Using this method, the caffeine is dissolved from the beans by carbon dioxide in the super-critical fluid state at high pressure. Pre-steamed beans are soaked in a bath of super-critical carbon dioxide at a pressure of 73 to 300 atmospheres. After a thorough soaking for around ten hours, the pressure is reduced, allowing the CO2 to evaporate, or the pressurized CO2 is run through either water or charcoal filters to remove the caffeine. This process has the advantage that it avoids the use of potentially harmful substances.