A Coalescing Filter separates two ‘phases’, for example the removal of water aerosols and droplets from a gas. Coalescing filter housings have three ports, the inlet (wet gas with aerosols and droplets), the outlet (gas) and the drain (liquid). Coalescing filter elements installed in a housing separate the liquid from the gas. The liquid drains to the bottom of the housing and can be manually or automatically eliminated from the housing via the drain connection and valve. A gas free of aerosol and droplets exits the outlet port. Coalescing filters also will remove solid particles but are specifically designed for removing liquids, regular particle filters will not behave the same way.