Systems and methods control the fluid flow and pressure to provide stable conditions for immersion lithography. A fluid is provided in a space between a lens and a substrate during the immersion lithography process. Fluid is supplied to the space and is recovered from the space through a porous member in fluidic communication with the space. Maintaining the pressure in the porous member under the bubble point of the porous member can eliminate noise created by mixing air with the fluid during fluid recovery. The method can include drawing the fluid from the space via a recovery flow line through a porous member, and maintaining a pressure of the fluid in the porous member below a bubble point of the porous member during drawing of the fluid from the space.