Originally Posted by Farm Hero
Yea, have dumped many spent carbon filters into the compost heap. The carbon pellets don't break down very fast ime.
In the heap, ya can't hardly tell the carbon pellets and the fresh rabbit dung pellets apart from a distance.
I would wonder if they ever break down. A method to keep fence posts from decaying is to burn the ends that go into the ground. Not sure if it works forever or just a lot longer than not burning the ends