Abstarct: Abstract Membrane distillation technology has attracted much attention in recent years as a more economical alternative to conventional water purification such as reverse osmosis systems. This technology uses low-grade waste heat from power plants and other heat-generating facilities to produce nearly distilled water from seawater. Other advantages of this method include the possibility of using renewable energy sources such as solar energy, ocean waves, and geothermal energy, which helps reduce dependence on fossil fuels and increase environmental sustainability. Membrane distillation does not require pressure and is much simpler and less expensive than other membrane processes that operate under osmotic pressure. These features allow the separation ratio for non-volatile solutes to reach 100%. In this study,a commercial hydrophobic polytetrafluoroethylene (PTFE) flat membrane was used and its surface was made hydrophilic by oxygen plasma. This change in membrane surface properties has resulted in a doubling of the water flux in direct contact membrane distillation. These advances could help improve the efficiency of water treatment systems and help solve the water crisis.