@rcontrera is the guy to ask about this thing
Do you worry about air fill quality when diving? The Personal Scuba Filter mounts easily between DIN 300 tanks and the compressed air source. Produces Grade E breathing air by removing moisture, hydrocarbons, oil, taste/odor, and converts CO to less dangerous CO2.
nuvair.com
These things are not very cost effective though as the filters need to be replaced very often, they are cycled every time you fill which isn't great, they're rather big, and you MUST be filling directly from a very small compressor or you will exceed their flow rate and then there is not enough dwell time to bother. Your compressor is on the upper limits of fill rate for example so you have to be filling directly.
For the cost it really isn't that much more to add another filter to the compressor like what's linked below that would be much more economical in the long run. In that case since you're in a fairly humid area you would have your first tower filled with a drying cartridge that is replaced much more often than the filtration cartridge in second slot and would make the drying cartridge repackable. Way more cost effective.
This filter tower add-on kit is designed for use on Coltri MCH3, MCH4, and MCH6 compressors that were purchased without filtration capabilities. This kit is comprised of OEM tubes and connectors and includes an SC000340-M filter element.
nuvair.com