أرسل هذا في رسالة قصيرة: Effects of activated carbon and cationic exchange resin pretreatments on groundwater defluoridation by reverse osmosis process

  ______   __   __   _    _     _____    _____    
 /_   _//  \ \\/ // | |  | ||  |  ___|| |  __ \\  
 `-| |,-    \ ` //  | |/\| ||  | ||__   | |  \ || 
   | ||      | ||   |  /\  ||  | ||__   | |__/ || 
   |_||      |_||   |_// \_||  |_____|| |_____//  
   `-`'      `-`'   `-`   `-`  `-----`   -----`