OK, doing some research it looks like there are various ways, but I only remember baking as a viable way to clean carbon. The most reasonable process seems to be baking the carbon in a single level on a baking sheet for 1 hour at 300 degrees. Does this sound about right?
Also, have you been able to determine what the round pieces are in the GF air filter mix?
Thanks for the tip on cleaning it! I did not think it worked, so I bought… I’m going to take apart my second spent cartridge and bake the charcoal and give it a try, but please let me know if 1hr at 300 is correct.