Home/Technical Glossary/Inert Gas Dryer Inert Gas Dryer An inert gas dryer (aka gas recirculator-purifier) is a filtration system which recirculates inert gas like argon, nitrogen, helium or a combination thereof, thru a moisture and oxygen getter filter. Gas filtered through this kind of system can reach moisture and oxygen levels of less than -74dp°C and  1-5 ppm oxygen.