This is a high quality carbon. Constant size, little dust. I bought the wrong size last time. That's the size I needed. I drilled a hole in the side of the face mask filters (organic vapor filter), dumped the old charcoal, filled it with new charcoal, and sealed the hole with a piece of duct tape. Repeat the process as many times as necessary. This way you can save a lot of money. Of course, there are many other uses for it.
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