This is the simplest and cheapest way to make a carbon scrubber. You can get everything at walmart. For this to work you need an exhaust fan and some dryer duct , or whatever duct will work. Here's the list and prices. 1. Activated carbon in plastic tub. $5.97 2. Knee high panty hose $.39 cent. 3. duct tape $ 2.00 The tools you need are either a soldering iron, a drill , or a screwdriver to poke holes. This is the carbon to buy. First you take off the lid and wrap the knee high around it. Then you pour/ stuff all the carbon into the knee high and tie it off. Now you make your holes. A drill or a soldering iron is the best way just make a bunch of holes the plastic is strong. Now stuff the pantyhose filled with carbon into the holed up tub. Now wrap the other panty hose on the outside and tie it off . That's it now just duct tape this beast on your duct and it'll work and it's cheap.