Text this: Graphene oxide membrane used in water purification device

 __   __   _    _     _____    __   __            
 \ \\/ // | || | ||  |__  //   \ \\/ //   ____    
  \   //  | || | ||    / //     \ ` //   |    \\  
  / . \\  | \\_/ ||   / //__     | ||    | [] ||  
 /_//\_\\  \____//   /_____||    |_||    |  __//  
 `-`  --`   `---`    `-----`     `-`'    |_|`-`   
                                         `-`