There is an immense need for developing low cost porous thermoplastic foams for economical water filters that could be provided to economically weaker sections residing in rural areas of india. till now, most of the porous materials have been developed using thermoset polymers such as polyurethane which cannot be recycled once it chokes. disposal of these themoset polymers has been extremely challenging in the last decade as they are getting collected in large mounts. these polymers do not degrade, nor can be remoulded to be utilized in other applications. hence there is a need to develop porous materials which are low cost as well as can be recycled. in this research work, a new method for continuous manufacturing of porous thermoplastic foamed sheet has been put forward. nitrogen gas is utilized as physical blowing agent and is dissolved in low density polyethylene inside a gear pump integrated single screw extruder. these porous sheets can be readily utilized to develop low cost water filters and thereby reduce the happenstances of numerous water-borne diseases. also, the environmental waste due to plastics would reduce significantly, as these thermoplastics can be recycled and be utilized in other applications.this technology would revolutionize the water-filter industry and would successfully provide low-cost water filters to the people living in rural india.