One of the most valuable resources in the world is water. Desalination is the procedure used to remove dissolved mineral salts from water.

Currently, one of the most popular methods for obtaining fresh water for use in agriculture or human consumption when applied to seawater. It serves as the only supply of water in several regions of the world.

Reverse osmosis (RO) involves applying pressure to water and forcing it through a membrane that traps salt and other contaminants. It is a good method for sea water desalination.

What steps do we do in seawater desalination?

Drawing water from the ocean and forcing it through a membrane are not the only two steps in a seawater reverse osmosis desalination plant (SWRO). There are several additional actions needed.


The first step, intake

It’s quite obvious what this means. The mechanism draws seawater from the ocean into itself. Others may draw from seawater used for cooling in a power plant, while some draw straight from the ocean or from wells on the shore.

To reduce the loss of marine life and take intake system fouling into account, specialized intake systems are created.


The operation and maintenance of the seawater reverse osmosis system process depend heavily on prefiltration (SWRO).

Remove any particulate materials that can clog the membrane. A pretreatment system can make use of a variety of technologies to reduce biological and inorganic foulants to their ideal levels.

Multimedia filtration is used in traditional systems, while alternative systems combine a particular filtration medium with disinfection or micro- or ultrafiltration techniques.

The main step, reverse osmosis

We’ve reached the major part of the system at this point. In this stage, salt and water are separated to create a brine solution that is extremely concentrated.

The previous prefiltration procedure keeps the membranes clean, allowing the water to travel through without being obstructed.

Post Remineralization/Disinfection

After these processes, the elements of water that make it healthy for our bodies and delicious are frequently eliminated in addition to the salts.

Among these minerals are calcium and magnesium. Additionally, they restore the pH of the solution, which is frequently acidic after treatment.

However, disinfection using chlorine, chloramine, ozone, UV radiation, or a combination of these treatments can be employed to prevent pathogens from growing in treated water storage tanks.

Finally, discharge

There is a surplus of a highly concentrated brine solution following the seawater desalination process (SWRO). It’s important to manage and dispose of this brine with care.

Animal and plant life is negatively impacted by the excessive salt level. The ideal method is to discharge it into the ocean using an outfall brine discharge device that has been properly created.

The vast and naturally self-regulating oceans. The saltwater must be spread out over a vast surface area, though, to maximize its dilution factor because some marine life is extremely sensitive to variations in salinity.

What we can benefit from SWRO?

After many years of study, testing, and new innovations, reverse osmosis systems have significantly improved. As additional process improvements are put into place, overall capital and operating cost reductions are still being seen.

Because RO systems don’t need to employ thermal (steam) energy in addition to electrical energy, they are less expensive than thermal systems.

Aside from lower expenses, the SWRO system has other advantages. Desalination provides an additional source of drinking water in areas where there is a shortage of fresh water, as was noted at the beginning of this article.

Additionally, even in drought-like situations, the process intake volume is not hampered. Furthermore, RO systems are modular, making it simple to construct them and requiring little space to operate them.

In arid conditions, SWRO treatment is therefore particularly beneficial for both potable and non-potable purposes.

These saltwater desalination systems (SWRO) are also helpful for communities on islands and in coastal areas, as well as in areas with limited annual rainfall.

Recommended filters

Process Stage Recommended Cartridge Filter
Protection Filtration Before RO Polypropylene Melt Blown
Polypropylene String Wound
High Flow Cartridge Filter
CPI for RO/UF Polypropylene Pleated Cartridge Filter
High Flow Cartridge Filter


For the precious water resource, what we can do, is not only save but also transfer seawater into usable water. SWRO is an efficient and economical way to accomplish it.

Brother Filtration, as a filtration expert, offers filter products that can be the perfect protection for membrane products.

By using a filter before the membrane filtration, the lifespan of RO membrane or UF membrane products can be significantly extended. More than that, the output of the membrane can be also improved by using our filter for prefiltration.


Wanting more information about Brother? Contact us now!

Contact Us

Have Questions?

Get in Touch

error: Content is protected !!