30 psi directed at the cutting tip should do a fair job of debris removal. I use a compressor with a 90psi out put but I reduce it down alot at the machine. Not sure of the actual amount being delivered. A small air compressor (pancake style) would do an ample job if you don't want to take the chance on the mist. Put something like a 1/4 inch ball valve at the end to control the flow.