Any use for old carbon filter media??

[Tomatoesonly]

With these filter scrubbers basically being throw away, because they seem to be so hard to refill ( ac infinity has a new refillable one now), but is there ANYTHING we can use the old filter media for?
Can it be used the same as BIOCHAR? Will it absorb good nutrients and kill plants?

 

[troutman]

It won't hurt to throw it in an outdoor garden.