What is Reverse Osmosis in Water Purifiers and How Does it Work?

RO water purification technology is one of the best purification technology available on the market. Because of their reliable performance in cleaning and purifying water, RO purifiers have become the first choice in many households. This further has led to manufacturers coming up with the latest designs and innovations in RO purifiers. But, do you know what is the science behind reverse osmosis? Let us try understanding it in simple terms.

What is reverse osmosis?

Reverse osmosis is a water purification technology. Wherein it removes unwanted particles from water, making it clean and pure. These particles can be dirt, disease-causing microbes, heavy metals, or other pollutants. Not only this, but it also works well in removing the sour taste of water. With its multistage filter, it ensures their elimination. Hence, making water fit for drinking. This multistage filter comes with a semi-permeable membrane, that allows selective movement. In addition to this, RO purifiers are also efficient in removing the hardness of the water. And work well with muddy water. Also, they efficiently remove the microbes after killing them. This feature makes the water more hygienic.

Now since we know what does RO purifier do? We can go on discussing how RO works?

How do the RO purifiers work?

Before we know how reverse osmosis purification works, we must know about Osmosis.

Osmosis is the movement of water molecules(solvent) from high to low water concentration through a semi-permeable membrane. It mainly occurs in humans and plant cells, as it equalizes the concentration. This ensures the proper distribution of nutrients and solute particles inside and outside of cells. We do not want the same to happen with our drinking water. We want our water to get purified of contaminants. So, we use reverse osmosis. Let’s understand it.

In reverse osmosis, external pressure using electric power is applied. It reverses the osmotic movement. Water(solvent) here passes from low water concentration to high water concentration area. It again occurs through a semi-permeable membrane. This movement removes 90% of TDS and filters out impurities.

What are the different stages in reverse osmosis purification?

RO comes with four inbuilt multistage filters, which consist of:

  •  A sediment filter
  •  Pre-carbon block
  •  Revere osmosis membrane
  •  Post-carbon filter

The first one,  the sediment filter works to remove large particles like sand, rust, etc. at an early stage. This prevents the clogging of subsequent filters. The second stage includes the pre-carbon block that ensures the filtration of chemical compounds like chlorine. It uses activated carbon to attract such compounds and removes them. The third stage is the RO membrane(SPM) stage. And is a semi-permeable membrane. It is selective and removes larger molecules of sodium, lead, etc. In addition to this, it saves natural minerals in the water. Post-carbon filter enhances the taste and quality of water. And hence, gives finishing to water.


Since these are the times when the quality of drinking water remains a big question. Hence, purifiers are important. An RO purifier with its latest and most reliable water purification technology ensures you healthy water. And along with removing big dust particles it also removes the bad taste of water. So, even if the issue is not pollutants but taste, you can rely on RO purifiers. Hence, you can safely choose the one that suits your space and need.

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