An overview of Reverse Osmosis water purifier

It is clear from the name that a reverse osmosis water purifier is based on the reverse osmosis (RO) process. Before coming to the reverse osmosis process, you should know about osmosis. Simple or pure osmosis is defined as the flow of solvent molecules from the low concentration of solutes to the high concentration of the solutes through a semi-permeable membrane. The driving force in the osmosis is the concentration gradient, i.e., osmotic pressure.

Now coming toward the reverse osmosis process, which is opposite to the pure osmosis. A reverse osmosis process requires external pressure to overcome the osmotic pressure. This external pressure creates a force which converts the direction of the flow of solvent molecules in the opposite direction, such as from high concentration of solutes the low concentration of solutes as you know that the natural flow of solvent molecules is from the high level of solute to the low frequency of solute.

According to the Eureka Forbes service centre expert, the membrane is mainly of three types, i.e., permeable, semi-permeable or selectively permeable, and impermeable. The porous layer allows all the molecules to move freely through it; the semi-permeable membrane is selective and only enable particular units to pass through it. In contrast, the impermeable layer does not allow any molecules to pass through it.

One of the most significant applications of reverse osmosis is water purification because it removes all the dissolved solids along with the microbes present in the water as you know that the whole process of reverse osmosis is based on the semi-permeable membrane also known as RO membrane.

An RO membrane is made of synthetic material which is selective and only allows the water molecule to pass through it. This membrane contains several pours in it, which has a particular size, which is less than and equal to 200nm, i.e., Nanometers. It means that even your hair can’t pass through it because the size of the human hair is around 80,000-100,000 nm, i.e., Nanometers.

Previously it was used to treat seawater and brackish (TDS >500 PPM <30,000 PPM) water, but since the 1970s, it has also been used to purifier freshwater in the various fields such as domestic, commercial, and industrial. According to the Eureka Forbes service organization, the RO water purifier is mostly used water purifier around the world to brink pure and healthy water. 

Stages of RO water purifier

It also includes a series of steps which is given below:

  • Sediment filter

A sediment filter traps the impurities such as rust and calcium carbonate. The sediment filter is like a sieve which removes these particles and reduces the sediment. A sediment filter doesn’t remove any heavy metals to make the water tasty.

  • Activated carbon filter

It is a carbon filtering method that uses a bed of activated carbon to remove impurities using adsorption. At this stage, organic and chlorine or chlorine-containing compounds are removed.

  • Reverse osmosis filter

At this stage, maximum purification takes place. As discussed earlier that a reverse osmosis filter removes all types of impurities, including dissolved salts and microbes.

  • Optional carbon filter

At this stage, those types of chemicals are eliminated, which were not removed by the RO filter.

  • UV lamp 

A UV lamp produces UV light, which kills or suspends the growth of those microbes, which remains in the water after the reverse osmosis filtration process.

Benefits of RO water purifier

An RO water filter guarantees you to bring out 100% safe and pure water for drinking purposes. But it only possible when it gets proper service form the Eureka Forbes Aquaguard service. An RO water purifier has a big list of advantages out of them some are listed below.

  1. Reduced the Concentration of total dissolved salts. Most of the people take this feature of water purifier as a limitation of it because it removes the minerals also. The human body needs some minerals, which are called essential minerals such as Calcium, Magnesium, sodium, phosphorus, iron, etc. which you can take easily through your meal. For example, according to the World Health Organisation (WHO), the maximum concentration of calcium in water must be less than and equal to the 160 ppm/liter. This amount of Calcium can get quickly by eating one chapatti.
  2. It removes most of the diseasing causing micro-organisms, i.e., pathogens such as bacteria, viruses, algae, etc. Drinking of impure water causes millions of death every year; hence, it is necessary to drink water, which is free from biological contamination.
  3. RO water purifier also removes Cryptosporidium and Giardia from the drinking water, which reduces approximately 33% of gastrointestinal diseases.
  4. Leads, Arsenic, Mercury, Fluoride, etc. are toxic for the human body, which can be easily removed by the RO water purifier. These toxins are very much harmful or poisonous to the human.
  5. Impure water contains some unpleasant smell which destroys the taste of the food. A water purifier removes the unpleasant smell from the water.


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