Air Diffusers Membrane Type is used to transmit air and oxygen into sewage or industrial wastewater and is often shaped like a disc, tube, or plate. The bacteria and other microorganisms living in the water need oxygen to break down the contaminants. It is a device for enhancing the static pressure and decreasing the velocity of a fluid moving through a system. Air Diffusers Membrane Type is used to introduce beneficial essential oil molecules into the air of a space, resulting in a calming, fragrant atmosphere.