How hard is it to refill the cartridge?
Very easy. No tools are required to remove the cartridge assembly from the mounting base. Just push down on the locking tab and pull the cartridge assembly out of the mounting base. Now you can take the cartridge assembly to somewhere easier to work on. Remove the screws from the cartridge assembly and remove the cartridge plate. Discard the foam filter screens and used carbon. Pour in the new carbon and install the new filter screens. Reattach the plate. Slide the cartridge assembly back into the mounting base.
