Desalination sector in pakistan Desalination of water is one of the most important engineering task facing the many regions of Pakistan in general and the city of Karachi in particular．Lacking unlimited supplies of potable water，Paldstan has to depend on the desalination processes of brackish water and seawater to satisfy the ever—increasing demands．These demands are expected to reach the 3 million cubic meters per day only for Karachi city in the year 2006．Apart from Karachi,for the coastal areas of Balochistan and Sindh，the only answer appears to be seawater desalination．A concerted effort is required to produce potable water from the Arabian Sea as well as from high salinity wells in Southern regions．The coastal regions of Sindh and Balochistan are also witnessing rapid urban and industrial growth，which require good quality water．Installation of large-size seawater desalination plants based on Multi-stage Flash Distillation (MSF) and Reverse Osmosis (RO) should be considered seriously．It appears that desalination and water reuse may contribute almost twenty—five(25)percent of the water requirement in these areas．