What would using none breathing quality compressed air do to your paintball marker?

In order to compress it to 3k or 4500 psi you need to have a dryer unit on the compressor or else the air going into the tank will have a lot of moisture in it as the moisture will not compress like the air will. typically the air is also filtered so it is both cleaner and dryer than the air around you. this is only important because garage compressors do neither of these things so if you ever try to use a garage compressor (bad idea) than you will be putting wet dirty air through your marker.