Composition of seawater


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Major ion composition of seawater (mg/L)

 Typical SeawaterEastern MediterraneanArabian Gulf at KuwaitRed Sea at Jeddah
Chloride (Cl-)18.98021.20023.00022.219
Sodium (Na+)10.55611.80015.85014.255
Sulfate (SO42-)2.6492.9503.2003.078
Magnesium (Mg2+)1.2621.4031.765742
Calcium (Ca2+)400423500225
Potassium (K+)380463460210
Bicarbonate(HCO3-)140-142146
Strontium (Sr2+)13---
Bromide (Br-)651558072
Borate (BO33-)2672--
Fluoride (F-)1---
Silicate (SiO32-)1-1,5-
Iodide (I-)<12--
Others----
Total dissolved solids (TDS)34.48338.60045.00041.000

Note: The dot (.) separates thousands
        The comma (,) separates decimals

Source: Magazine - Water Condition & purification, Januray 2005

Reverse Osmosis Systems
Softener Unit FAQ

Currently the world uses 11.000 desalination plants to produce daily 20 million cubic meters per day. They mostly use seawater with an average TDS of 40.000 ppm and brackish water with an average TDS of 10.000 ppm and can be found in each continent

West Asia & Middle east60%
North America11%
North Africa7%
Europe7%
South and Central America4
Other11%

 

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