How long does it take to fully wet the carbon?
Typically, Calgon Carbon recommends filling the system with the fluid you will be treating and allowing the system to sit idle for 24 hours. This time will allow the fluid to displace all of the air in the pores of the carbon. After the system has been idle for 24 hours, the next step is to use an upflow backwash to displace any air that has been trapped in the carbon bed. This backwash will also remove most of the carbon fines in the system.
