The G5 Model has 3 temperature faucets; cold water is chilled around 44ºF, hot water is heated at 180ºF and ambient. The “F” assembly is comprised of a 5-micron sediment filter, a carbon (GAC) 10-micron filter and a post carbon filter to improve taste. The G5F has 3-stages of mechanical filtration. 1st stage 5-micron sediment filter, 2nd stage activated carbon filter and a 3rd stage post carbon filter