They have both smaller and larger pieces of charcoal. I use the smaller ones like a substrate, and then put the larger chunks on top to use to feed off of. I also use LECA as the substrate (still use the larger chunks on top of this to feed from), and actually like it a little better but it is more expensive.
I cut pieces of wood to the size that I prefer. Then I get out the wheel barrow and start a fire in it. I keep a 10 gal bucket next to it along with some long metal tongs. I let the wood burn and flip the pieces with the tongs so one side doesn't get too burned. If it is too burned, the charcoal gets brittle. I remove the wood when it begins cracking. The springtails seem to prefer hiding in the cracks. I let the wood soak for awhile and then pull it out of the bucket to wash it. After that, I start cultures and save the remaining wood. I like this method and seem to get good results from my cultures. However, there are other ways to culture springtails that require less effort.
This is getting a little off subject, and the Mods will probably kick this one to the curb soon, but since we don't have a "Rant and Rave" section, let me join in here.
Wal-Mart is a monster that is compromising the quality of life in America by sending our jobs and our money to China. Don't be fooled by their grassroots commercials. When Wal-Mart come to town, everybody looses.
Just say NO to Wal-Mart. Shop the "little guy" while you still have a choice, because someday you won't.
I need to stop now before I blow a gasket.
Vivarium Concepts http://www.vivariumconcepts.com
After culturing springtails a couple of different ways, I feel using treefern chunks is the best. Isually I cut 3 treefern chuns, each roughly 1" tall x 1.5" wide x 3" long. The 3 will fit in a 2 QT Glad container. Most Safewys, Fred Meyers, grocery stores sell these for packaging left-overs. After placing the treefern in the container, I add about 3/4" of RO water. Let the treefern pieces soak overnight. Then add springtails. I believe this method has produced the best results for me because of the amount of surface area for the springtails. The are able to find the best microclimate in the treefern where they breed. This method is not messy at all. When needing springtails, I just tap a piece of the treefern on the side of the tank and hundreds will fall out. I will also periodically mist the top of the treefern pieces too. I replace my water about every 2 months. The springtails that are floating is the water, get dumped into a tank. The springtails that remain in the treefern, start the next culture. They are fed cous-cous.
I found that charcoal today at the grocery store, and for full description reasons took a picture of the bag. It appears to be a Texas brand, but I am sure there is a similar brand in all states. But... since most states are sissys when it comes to grilling... you may be out of luck... move to TX