thank you for the reply.
my primary reason for the concern is - i am setting up a paint booth in my garage and i want to make sure that my filtration system is adequate (within reason
i am still learning what i need for air filtration.
i installed a desiccant system (see embedded image)
while re-doing the plumbing (1" galvanized pipe) for the new desiccant system, i noticed small / faint traces of rusty power / dust in the pipe. i am not sure where this residue came from. my assumption is that it originated from the compressor tank.