The sea water is water that makes up the oceans and seas , and is covering more than the 70 percent of the surface of the Earth. Seawater is a complex mixture made up of 96.5 percent water , 2.5 percent salts , plus smaller amounts of other substances, including dissolved inorganic and organic materials , particulates, and some atmospheric gases .


What is sea water?

Seawater is a solution made from the water that makes up the oceans and seas , which has a salty taste due to its concentration of mineral salts , mainly sodium chloride or table salt.

  • Sea water characteristics
  • What is it for
  • Components (edit)
  • Properties
  • Salinity
  • Benefits for the skin
  • Hair benefits
  • Benefits of drinking sea water
  • Nasal treatment
  • Contraindications
  • Seawater desalination
  • How to filter seawater

Sea water characteristics

The main characteristics of seawater are the following:

  • Seawater is a mixture of 96.5 percent pure water with 3.5 percent other materials .
  • Its flavor is salty and it has a slight odor produced by the decomposition of organic matter.
  • It maintains a more constant temperature than air due to its high thermal inertia .
  • It has a mineralization between 30 and 30 gr. of salts per liter.
  • In it we can find organic elements , such as phytoplankton and zooplankton .

What is it for

Seawater is a rich source of commercially important chemical elements . Much of the world’s magnesium is taken from seawater, as is large amounts of bromine . In certain parts of the world, sodium chloride, better known as table salt, is still obtained through evaporation from seawater. Furthermore, seawater, when desalinated , can provide an unlimited supply of drinking water . Many large desalination plants have been built in dry areas along the coasts of the Middle East and elsewhere to alleviate shortages.of fresh water .

Components (edit)

The water that we find in the ocean is made up of many substances. The salts that form include sodium chloride , magnesium chloride and calcium chloride , but probably the most important substance can be found in seawater is salt . This salt comes from mineral deposits that are obtained through the water cycle.

The dissolved salts in the ocean make up approximately 50 trillion tons and are formed by 10 elements key that are found in higher proportions and these are: chlorine, sodium, magnesium, sulfur, calcium, potassium, bromine, strontium , boron and fluorine.


The properties of sea water are the following:

  • Surface tension :  refers to the high surface tension due to hydrogen bonds .
  • Salinity : it arises from the combination of the different salts that we can find in sea water, mainly chlorides , carbonates and sulfates . Salinity is the total number of grams of solid substances in one kilogram of seawater. It is a property that is also affected by evaporation and by fresh water contributions from rivers.
  • Chlorinity : it is the amount of grams of chlorine that we can find in a kilogram of seawater.
  • The pH:  is the relationship between the hydrogen ions and the hydroxyl which provide some characteristics of alkalinity or acidity . Sea water is a bit alkaline with a pH of 7.5 to 8.4, which can vary depending on the temperature .


Salts comprise about 3.5% of the ocean’s water mass . Depending on the specific location, the salt content or salinity may have some variations in its percentage of salinity. When sea water mixes with fresh water, as at the mouth of a river, the salinity will be lower. But where there is a lot of evaporation and little water circulation , the salinity can be much higher.

Benefits for the skin

Sea water has great benefits for human skin, some of these benefits are the following:

  • Trace elements such as sodium, iodine, zinc, potassium, fluorine, sulfur, calcium, etc. that have healing effects.
  • When the skin comes into contact with sea water, osmosis is produced and it is nourished by these trace elements, benefiting from them.
  • It has antibiotic properties and can combat bacterial concentrations that affect the skin, such as eczema, allergies, peeling and other health problems and diseases of the epidermis .
  • It is an excellent antiseptic due to its concentrations of salt, potassium chloride and iodine.
  • The minerals in seawater help nourish the skin and its elasticity, improving its appearance and beauty.
  • It is a natural exfoliator for our skin, cleaning it of impurities and toxins accumulated on its surface.
  • Stimulates blood circulation .

Hair benefits

Sea water provides many benefits for the hair as it helps to rebalance , nourish and eliminate excess oil and dandruff . However, you should always wash your hair after being in contact with sea water. Seawater has the ability to calm and give strength to skin cells , cleanses pores , increases cell metabolism , hydrates and eliminates toxic waste and improves the growth and regeneration of cells, relieving psoriasis symptoms. and eczema , as well as other skin disorders.

Benefits of drinking sea water

Sea water contains a large amount of nutrients such as carbohydrates , macronutrients and micronutrients necessary for the body to function properly, which is why it is considered nutritious, organic and bioavailable that we can find within nature.

Nasal treatment

Saline water has the ability to naturally decongest the mucosa because it has an ideal salt concentration that produces an anti-inflammatory effect . After obtaining the sea water, the salt concentration is reduced so that it is compatible with the nasal mucosa while maintaining its minerals and trace elements . These products can also be used for nasal cleansing in babies from 15 days of age.


Drinking seawater causes the amount of salt in the bloodstream and the work required by the body to get rid of it increases considerably. It can cause dehydration causing various body functions to be altered, thirst increases and the amount of urine increased. People with heart problems, blood pressure problems, kidney problems , who suffer from vertigo and other types of health conditions, should be careful when using seawater.

Seawater desalination

This option has become a possible solution for places where there is a shortage of potable water. The main part of this process is based on the technology of reverse osmosis membrane and is a process physicochemical through which can remove minerals having water to make it suitable for consumption human.

How to filter seawater

There are different ways that seawater can be filtered. The use of graphene is perhaps the practice that has the most adherents, although however, there are other methods with which this process can be carried out, ranging from the use of strainers , filters , etc.

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