Mist eliminators remove fine particulate of suspended aerosols in air. These fine aerosols are less than 3 microns in size and hard to filter with regular filters. The various type of filters that have been used with varying degree of success are

Collection efficiencies in excess of 99 % are achievable.

Mist laden gases pass through a bed of filters. As the particles travel through the filters they are trapped and held by fibers. In coalescing filters these particles coalesce into drops on the filter's fiber surface and coalesced liquid drain by gravity. Particles are collected by combination of impaction, interception and brownian movement.

These filters have long life in absence of insoluble particulate. Dust particulate pose additional challenge and pre-filters could be used to trap dust particulate and increase the life of mist eliminators.