This invention describes a low temperature, self-sustainable desalination process operated under natural vacuum conditions created and maintained by barometric pressure head. The cells have a size distribution, D90 of greater than or equal to 300 \u03bcm and the sheet has a light transmission of greater than or equal to about 5%. If the issuer’s response to the request confirms availability, payment instructions to the issuer are sent from the web service to pay the supplier’s invoice.