What are those 2 mm maximum white spheres? They are kiln baked, and it's natural they say, so it must be clay based.
It looks like it would be cool biomedia. I ordered a sample.... They didn't even want shipping.
Edit: emailed them and they are made pf calcium carbonate. Not good for biomedia!
Last edited by deleted_user_7; 11-12-2010 at 05:38 PM.