Because of the limited freshwater resources, seawater has been always an important way to get water from many areas and countries. There are many different methods to treat seawater, but only three treatments are for large-scale desalination, which are multiple-effect evaporator (MED), reverse osmosis (RO), and multi-stage flash (MSF).

Salty River Of Blue Water At Sunset Near Mountains

This blog wants to bring all knowledge about filtration of sea water desalination to you, we believe you can have a better understanding of this aspect.

What is desalination?

Desalination is a method of water filtering used to purify saltwater of minerals and other impurities. Saline water is converted to use water for agriculture and drinking through the desalination process. Desalination systems are used in homes, yachts, hotels, and resorts with beachfront locations, as well as various commercial and industrial settings.


In regions of the world without access to drinkable water, the treatment of seawater has emerged as a crucial substitute for the generation of pure fresh water.

The ocean has offered an abundant supply of water that is available for human consumption as other sources, including rivers, lakes, wells, and springs, have grown progressively depleted as a result of excessive extraction.

Although ocean water has high levels of salt and cannot be used for drinking or for the majority of other purposes, seawater filters have made it possible.

What is Reverse Osmosis in sea water treatment?


As we mentioned above, there are three main seawater treatment methods, among them, RO is the most popular one. Due to its characteristics, which consume less energy and has a high desalination rate, RO has been widely used in many seawater desalination plants.

Systems for seawater reverse osmosis are made to eliminate more than 99% of saline contamination in the feed water. For the purpose of removing sodium chloride, preventing scaling, and maintaining system performance, these systems also include a washing and chemical purification device.

Reverse osmosis membranes and high-pressure feed pumps are the two essential parts of every seawater reverse osmosis system. Any reverse osmosis system’s core components require a specific application and thought to function properly.

In SWRO(seawater reverse osmosis), one thing that should be noticed and can not be ignored is the prefiltration for SWRO. Compared to surface water and groundwater resources, seawater resources often have a higher tendency for membrane fouling and require more thorough prefiltration procedures.

Process of sea water desalination

process of desalination

Every day Bother Filtration helps thousands of desalination plants to reduce their water footprint, increase productivity, and lower operating expenses.

And we are helping millions of people to live healthier lives by developing better ways to purify the world’s water sources, improve the food process, es and more. Below is a brief introduction to seawater desalination.

The first step: Sea water prefiltration

Many particles such as sand, clay, and natural organic matter can be removed by prefiltration for SWRO.

The second step: Debrine & Reverse Osmosis

In this stage, debrine is accomplished through RO. At the same time, 50% water can be output. Water passes through the RO membrane to remove the tiniest particles and contaminants.

The third step:  Stabilization

During this step, the pH level is adjusted and 50% water output, then we get purified water.

The filtration system of sea water desalination

Now we already have a good knowledge of filtration for seawater desalination. We will simplify it into three main filtration steps.

filtration of sea water

Protection filtration for RO system

We use different micron ratings of filter cartridges to eliminate various sizes of contaminants. By removal of those particles, we can protect our RO system, and improve its efficiency of the RO system.

There are mainly three different micron ratings , which are micron filtration(to filter germs between0.1~1um), Ultrafiltration(to filter protein and virus between0.01~0.1um) and Nanofiltration(to filter salt between 0.001~0.01um).

Here the filter cartridges we mainly used are:

Polypropylene Melt Blown cartridge filter, with years of experience, Brother Filtration is able to custom you special PP melt blown filters with varied specifications.

meltblown filter
PP string wound

Polypropylene String Wound cartridge filter, is a durable and economical choice for fine filtration.

High Flow Cartridge Filter is the best seller and flag product of Brother Filtration, the most popular one is Max A high flow cartridge filter, with a large water flow capacity and large filter outer diameter.

maxa filter

Filtration after RO system

After the profess of RO system, the main objective is to remove tinniest particles and contaminates, here we need filter cartridges with Absolute Ratings.

Polypropylene Pleated Cartridge Filter offers a higher filter surface area and exceptional contaminant capacity.

High Flow Cartridge Filter has a high flow rate and large dirt-holding capacity, helping customers to improve filtration efficiency.

The Final Filtration

pleated filter cartridges

At the final filtration, we need to do further precise filtration to make the water drinkable, here the main filter cartridges we use are Polypropylene Pleated Filter and Polyethersulfone Membrane Pleated Filter.


Wave Edge

In today’s usage of complex water resources, desalination occupies an increasingly important position. RO technology is an essential part of seawater filtration, which offers pure water and needs prefiltration.

Every stage of seawater filtration needs to be paid attention and selecting different filter cartridges due to the various characteristics of different particles and contaminants.

Brother Filtration has been deeply involved in the filtration industry, designs and manufactures various filter cartridges and filter products, which fulfill the needs of seawater treatment.

And we have already helped many desalination plants to do their seawater filtration. If you have any problems with sea water filter cartridges and RO systems, or you want to have a professional suggestions, please feel free to contact us.

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