Edwards EMF10 Dual-Stage Exhaust Mist/Odour FilterEdwards EMF10 Dual Stage Exhaust Mist Odour Filter Overview Mist filters capture oil mist from the outlet of pumps, which would otherwise be ejected into the atmosphere. This may happen when you use gas ballast or when you pump high gas throughputs. You can also return oil trapped in the mist filter back to the pump, although you must ensure that the process gases will not contaminate the pump or pump oil. The EMF10 mist filter is suitable for use