The concept of a charcoal filter clearing the air while using solvents sounds nice, but in practice it is ineffective and expensive. I used mine while working with contact cement and now the thing smells like contact cement. I suspect it is saturated, and without any way to purge it, is no longer any good. Additionally, while working I was much closer to the contact cement than was the filter, so whatever got to the filter had to pass by me first. Well, I also wore a charcoal filter mask and I think that is the way to go. You only filter what you breath and the filter is between the solvent and you--a much cheaper and effective solution. I would put my money there not in this device.