The method manufactures a nozzle plate having nozzle orifices for ejecting liquid droplets. The composite sheet includes: a magnetic sheet; and a conductor sheet stacked on the magnetic sheet for shielding an electromagnetic wave and radiating heat. The method further includes forming an asymmetric porous ceramic layer on a surface of the asymmetric porous ceramic tube by using a phase inversion process. The system may also include a vessel with a vented cap for storing the disposal solution prior to and during use.