Water Filtration

Brackish water is defined as water containing more salinity than fresh water, but not as much salt as sea water.  Brackish water can be the result of mixing sea water with fresh water, as naturally occurs in estuaries (bodies of water where fresh and salt water mix, typically where river meets sea), or it may be contained in brackish fossil aquifers.  Certain human processes can result in brackish water, such as civil engineering projects like dikes and deliberate coastal marshland flooding to produce water pools specifically for optimum freshwater prawn farming.  Brackish water is also the primary waste product of the salinity gradient power process water filtration system.  Brackish water is not conducive to the healthy growth of most terrestrial plant species; if not managed appropriately, it can damage the natural environment.  The term “brackish” covers a wide salinity ratio and is not precisely defined as a specific percentage, so brackish surface water salinity can vary widely over time.

Estuaries are common all over the world and are often used for fish farming and ranching.  The Amazon River empties so much freshwater into the Atlantic Ocean that it reduces overall sea salinity for hundreds of miles.  There are several river-to-sea estuaries on the East Coast of the United States: in Maryland, Delaware, Virginia, New York and New Jersey, as well as South Carolina and San Francisco, California.  There are also brackish seas and lakes, such as the Baltic, Black, and Caspian Seas.  Lake Charles in Louisiana and Lake Monroe in Florida are the two brackish United States lakes of record.

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