Formic acid is one of the main drawbacks of using insect aspirators to collect ants.


I bought
FERRODAY 5/16 Barbed Air Line Filter
from Amazon and attached it to the aspirator tube, but that only filtered out particles, and not organic compounds like formic acid.
from looking at air purifiers, I saw that they all used activated carbon to filter out smells and odors -- so I got some activated charcoal powder an poured it into one side of the air filter (the side that faces away from you when you're using the aspirator -- AKA the side labelled "IN") and shook it around to spread the powder all throughout that side of the filter. It worked like a charm, and I can now suck up carpenter ants without any formic acid getting into my lungs.