Charleen: I found this awhile back explaining the differencences between Horticultural Charcoal and Aquarium Charcoal: http://www.paghat.com/charcoal...
Plant nurseries and orchid supplier's usually carry the horticultural grade charcoal.
~ I'm an old gal who still loves playing in the dirt!
~ Playing in the dirt is my therapy ... and I'm in therapy a lot!