We have used a high micron charcoal filter and have had pretty decent results but are switching to chill filtered with plate and frame. I do not suggest using a pneumatic due to the fact that it is not a constant flow and more of pulsating which can mess with your filters. But unless you have an explosion proof pump, quite expensive, have to go that route of pneumatic i am sure you will be alright to n extent.
hope that helps.
cheers