What Is RO Water Purifier? How Does It Work?

Water is the basic necessity of life. No soul on Earth can survive without water. But the degraded water quality is a major concern for consumers.

The condition of water quality is below the desired level in many places. Water is highly contaminated with dust, dirt, chemicals, etc., making it completely unsafe for use. This drives our attention to the need to have a suitable water purifier.

Water purifiers play an important part in delivering us high-quality drinking water. Fulfilling their requirements, there are plenty of different water purifiers available, justifying the different needs of different people.

However, amidst the many available water purifier options, if you are looking for the one that can provide you with clean drinkable water of high quality, then a Reverse Osmosis or RO water purifier has no match. The filter is a trusted and one of the most efficient choices to make.

While you are searching for a water purifier, don’t make a hasty decision; rather, get all the details and then make a wise decision. This detailed guide about the RO water purifier will provide you the needed thorough information about the purifier to be sure when buying the same for your use.


What is Reverse osmosis?

Reverse osmosis

Reverse osmosis or popularly known as RO is a simple water purification technique. This purification technique purifies the contaminated water into pure and clean water bypassing the water through a semi-permeable membrane with full pressure.

It could be understood that the membrane acts as a barrier between the contaminated particles and freshwater particles. The small pores available on the membrane allow the water molecules to pass through while leaving the contaminated particles behind.

Clean drinkable water is provided as the contaminated water flow from the heavier contaminated side to the low contaminated side. The water purified using RO technology is known as permeate, and the contaminated or wastewater is known as brine.


The working of RO purification system:

The RO purification system works its best for removing the maximum of impurities and contaminations from the water. The working of the RO purifier revolves around the use of pre-filters, semi-permeable membranes, and post-filters. Every component available in the purifier has its own special role in purifying the water.

Briefly, the water passes through the pre-filters to remove all the available chlorine and sediments from the water. The water is then pressurized to pass through the membrane, which further works to remove the present impurities. Later, the water passes through the post-filters to polish its quality.

Every purifier comes with a different purification technique according to the number of post and pre-filters present. Depending upon the filters, the working of the RO system can vary from 3, 4, or 5 purification stages.

These different filters have their different roles in the purification of water. For instant –

  • Sediment filters – these are known to reduce dirt, dust, and dust particles from the water.
  • Carbon filters – these filters work for the organic compounds, chlorine, and other contaminations that cause bad odor and taste in water.
  • Semi-permeable membrane – it ensures to remove nearly 98% of TDS (total dissolved solids)


Different filtration stages:

For its efficient working, a RO system undergoes different filtration stages, which are as follow:

Pre-filter filtration stage (stage 1) 

As soon as the water enters into an RO filter, it moves to the first stage of purification, a pre-filter stage. The pre-filters used in a RO system are carbon and sediment filters used to remove chlorine and sediments. This prevents the clogging or blockage of the semi-permeable membrane.


Semi-permeable filtration (stage 2) 

After the pre-filters, the water is then passed through the semi-permeable membrane present. This stage is quite effective as it helps in removing even the smallest dissolved particles that are hard to remove.

Generally, the membrane is made using high-quality synthetic plastic, which is capable of blocking molecules like sodium, chlorine, urea, bacteria, and viruses. The membrane is also effective in removing fluoride, chromium, selenium, and other harmful molecules.


UV Lamp filtration (stage 3) 

Many RO purifiers are designed with a UV lamp filter. This filter fight against the pathogens available in water and thus disinfect all the bacteria present. The powerful UV rays are used for killing the microorganisms by attacking their root core. As a result, the microorganisms cannot reproduce.

The UV filter ensures killing 99.99% of harmful microorganisms making the water safe, pure, and clean for consumption.


Post-filter filtration stage (stage 4) 

It is the final stage of water filtration which makes use of an activated carbon filter. During this final filtration stage, the water purifier removes all the remaining contaminants from the water.

The activated carbon filter polishes the water quality and makes it safe for drinking.

Along with these mandatory filtration stages, many RO water purifiers are designed with advanced technologies. You can find RO purifiers with TDS controller technology that ensure maintaining and controlling the TDS levels of the purified water. Thanks to this, you can be sure that the drinking water is within the required capabilities as needed.

Also, you will find many RO water purifiers with water-saving technologies. Thanks to these technologies, a minimal amount of water is wasted during the use of the purifier. However, even the minimal wastewater from RO purifier can be used for different purposes.


The Offered Benefits From A RO Water Purifier System:

Benefits From A RO Water Purifier System

Reverse osmosis is one of the most popular filtration methods. The purification not just removes impurities but cares about the water quality as well. As a result, the delivered water is all safe and refreshing for use.

Here are some of the benefits that can be expected from a RO water purification system:

  • Reduction in the concentration of impurities and contaminations
  • Reduced amount of sodium in water
  • Controlled bad odor and taste. RO purification improves the taste of water
  • More and better benefits for the environment
  • Convenient to install and easy to use
  • It can easily be placed anywhere without any hassles
  • RO system requires minimal timely maintenance. Thus, it helps to save the regular maintenance cost needed for delivering its performance.


Are All The RO Purifiers And The Required Filters The Same?

You can find several different RO purifiers and filters in the market. While most of them may look the same in their design and parts, there are many substantial differences.

Generally, a RO system differs mainly in 3 basic ways, which are:

  1. Number of filtration stages
  2. The total amount of purified water produced per day, and
  3. The quality of the various components used

Amidst the mentioned factors, the quality of the components makes the most significant impact on the working of the RO system. If the component’s quality is not great, the RO will not deliver the expected performance.

Thus, when you are checking the component’s quality, make sure to go through the checklist of these essential factors –

  • The existing user’s review of the components
  • The brand of the components. Make sure to only choose the components from a reliable and well-established brand.
  • RO should be using up-to-date technology for purification
  • Also, check for the rejection abilities of the RO system for the contaminations and impurities

Being aware of such little details can assure you of finding the best RO water purification system with high-quality filters and components for amazing performance.



Does RO water purifier remove healthy minerals from water?

Mostly, tap water contains inorganic minerals, which affects the taste and odor of the water. A RO      purifier removes the majority of minerals, but that does not ruin the health or quality of the water.

Mostly the minerals available in water are inorganic and thus cannot be easily digested by the body. Thus, the removal of such minerals doesn’t make the water unhealthy. Rather, the use of the RO filter enhances drinkable water quality for better health benefits and digestion.

Moreover, during the post-filtration stage, the water quality is polished for improved taste and health factors.


Is it necessary to use a RO purifier with a storage tank only?

The RO purification process removes most of the impurities and contaminations from the water; however, it is a slow process. In general, a RO purifier takes 1-2 minutes to produce 2-3 ounces of pure water.

Thus, if you need a glass of pure water, you would have to wait for 5 minutes to get it full. It is, therefore, suggested to use a RO water purifier with a storage tank. This will help you store clean, purified water and use it as and when needed.

You can vary the capacities of the storage tank according to your needs and requirements. Large families can opt for a purifier with large capacities to have a continuous flow of high-quality pure water.


What are all contaminations removed from a RO water purifier?

Unlike the other purifiers that remove some impurities and contaminations, a RO water purifier ensures to remove the majority of contamination from the water. The different filters available in the purifier helps in removing the majority of total dissolved solids.

Other than this, the activated carbon filter removes chlorine, bad taste/odor, and sediments to enhance the water quality. Here is the list of all the impurities and contaminations removed by the RO water filter:

  • Fluoride
  • Chlorine
  • Sediment
  • Bad taste and odor
  • Salt
  • VOCs
  • Arsenic
  • Pesticides
  • Bacteria and viruses – a RO purifier is not effective in removing bacteria and viruses as the same can grow on its membrane and then get into the water. If you have a water supply with bacteria and viruses, it is advisable to use a UV-enabled water purifier.


How long a RO water purifier last?

A RO water purifier can last for nearly 10-15 years. The purifier is a long-lasting device, but you should be regular in replacing the filters and the membrane for uninterrupted service.

The filters (pre-filters and the post-filters) should be replaced after using them for 6 months to 1 year. On the other hand, the purifier membrane needs a replacement after 2 to 4 years.

The lifespan of the purifier largely depends upon the water quality and the use frequency. Make sure to keep a close check on the performance of your purifier to be sure about its maintenance and timely replacements of the filters and membrane.


Is an RO purifier good for your health?

Yes, a RO system is good for your health. The purifier is known to remove all the major contaminations and impurities (including the TDS, which is otherwise hard to see from the naked eyes) from the water, making it safe for consumption.

However, the purifier also removes some essential minerals like magnesium, calcium, etc., it doesn’t make the water less beneficial for the body. These essential minerals can easily be absorbed by consuming healthy food to make a difference in the body.

Moreover, the RO water purifier can also reduce water hardness making it more suitable for drinking consumption. Thus, considering the overall situation, it can be believed that a RO system is a good choice for benefiting your health.


Does a RO water purifier system benefit the environment as well?

Yes, the use of the RO water purifier is safe and beneficial for our health, but it also benefits the environment.

Generally, the water drained from our homes contains chemicals removed before reusing the water for any other purposes. Thus, the drain water is treated before its use. Such treatments cause a burden on the ecological balance and cause harm.

In the case of a RO system, the drained water is already free from all the major contaminations and chemicals. As a result, it can easily be reused for various other purposes without the need for any further treatments. Thanks to this, the environment is well-protected against any further pressure or loads and thus is benefitted.


Does a RO purifier wastewater?

A RO system rejects the water with contamination which is ultimately drained as wastewater. On average, 75% of the input water is rejected from a RO system because of impurities. The water rejected from the purifier is needed for the purification process.

The drained water from a RO water purifier can easily be reused for multiple other uses with the right knowledge and information. So, if understood, the so-called ‘wastewater’ of the RO purifier is not a waste but a water source used for other important purposes.


Reverse Osmosis or Bottled Water – Which One To Choose?

Generally, it is confusing to choose either between bottled water or purified water from the RO system. Both the options are highly purified and thus are appealing, making a choice confusing.

As both the choices are attractive and safe for our health, it is the amount of wastewater that should be considered. Both the procedures wastewater while purifying it, but more water is wasted than RO’s wastewater for bottled water. Also, you need more water to keep the machines, equipment, and transportation clean (from shipping bottle water) clean and hygienic.

The second advantage that RO purification gets over the bottled water is convenience. Both the procedures provide you the same level of water purification, but to get bottled water, you have to go out. Whereas, you can enjoy RO purified water just at the comfort of your home with all the convenience and ease.

Lastly, the bottled water can be used just once; however, you can store the purified water from a RO system for later use as and when you want.

With all such benefits over bottled water, using a RO system for getting purified water is a clear choice. Isn’t it?


Reverse Osmosis VS Water Softener – Which is Better?

If you think using a water softener can provide you with the same water quality as a RO purifier, you are wrong. Using a water softener helps remove the hardness from the water; however, the water is not filtered or purified.

On the other, a RO system not just removes water contaminations but also makes water soft. If you are using a RO system for treating hard water (above 7%), it can shorten the life of the RO system along with demanding frequent replacements and maintenance.

Comparing the two, it can be said that both – RO water purification systems and water softeners are designed to complement one another. You can install a water softener and your RO water purifier to get the best quality soft water benefiting not just your health but also the surrounding environment.

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Final Shared Words:

RO water purification system has plenty of benefits and advantages over its shortcoming of producing wastewater. The filtration system is a must-have in the present time to get high-quality contamination-free purified water. Give yourself a treat of pure refreshing water by getting the best RO purifier for your needs.

We hope this detailed guide about RO water purification would have been appealing to motivate you to use a RO system now. For any more related information or questions, we are available with our assistance. Leave us your thoughts in the comments.



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