Seldon Laboratories, LLC, proposes a lightweight, low-pressure water purification device that harnesses the unique properties of carbon nanotubes and will operate for an extended period of time to remove microorganisms from large quantities of water. Seldon's proprietary production process results in a membrane composed largely of carbon nanotubes fused to one another. This project will build on the successful results of the Phase I testing to treat higher volumes of water by creating larger membranes and housings suitable for use in spacecraft. The very low pressure requirements will significantly reduce energy and other input requirements. The device will be sufficiently versatile so as to be incorporated into existing systems or used as a standalone system for water treatment.