Re: DIY - discussion on building a DIY hookah diving compressor
Along with air, in your system you will also be breathing in lubricating oil found in the air stream of tool compressors. You can do it, but its terrible for you... Pretty much like inhaling wd-40 every time you use it. This is part of why SCUBA compressors are so expensive, they use special engineering to ensure that no oil is transmitted to the tank, while many pneumatic tools rely on this oil to lubricate themselves.
Oil filters do not completely eliminate this unless they have been rated for breathable air. And when you look at the ones rated this way, you get really close to the $1,000 price for a commercial unit.