Sintered air stone diffusers are often used for porous gas injecting. They have different pore sizes(0.5um to 100um) allowing small bubbles to flow through it. They can be used for gas transfer aeration, generating high volumes of fine, uniform bubbles often used for the treatment of wastewater, volatile stripping and steam injection. With greater gas and liquid contact area, the time and volume required to dissolve gas into liquid is reduced. This is accomplished by reducing the bubble size, which creates many tiny, slow-moving bubbles that result in a large increase in absorption.