Carbon Filter. Ripped from EDIT:
The EHLE Active Carbon System Adaptor is suitable for both loose activated carbon stones as well as customary filter cartridges.
The activated carbon filters out many toxins and carcinogens as well as protecting the main bong chamber from unwanted dirt, ash and residue from the bowl.
Improve your smoke flavour and keep your bong clean and healthy with the EHLE Activated Carbon System.
or...you could vaporize.
Edit: I think I finally see what you're doing with this rig KC. This is slick man, I can't wait to see it up and running. I love that it's all DIY but it's so, so clean; haha way to go pot heads! We're No. 1!
