RO vs UV vs UF - Difference Between these 3 Water Purifiers
different types of water purifier

RO vs UV vs UF – Difference Between these 3 Water Purifiers

In this article, we have discussed the various types of water purifiers and tell you how to pick the best between Ro Vs Uv Vs Uf.

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Water purifiers are the need of the hour. There are different types of water filters available in the market. Hence, it is necessary to choose the right kind of filter. A water purifier buying guide can help you do that. Primarily, there are three types of water purifiers. They are- Reverse Osmosis Water Purifier, Ultra -Violet Water Purifier, and Ultra- Filter Water Purifier. They are commonly known as RO, UV, and UF, respectively. Before we buy any water purifier, we need to know the difference between the three.

This article discusses RO v/s UV v/s UF on all possible scales of consumption. You can get to know the difference between RO UV and UF technology here through this article. And which one might be suitable for your household or office.

What Is A RO Water Purifier?

Let us first discuss what a RO water purifier is. For that, one needs to know what RO means. RO means reverse osmosis. Reverse osmosis is a process of water purification. In this process, the water flows in a direction which is opposite to the direction of osmosis. This happens because the hydrostatic pressure is more than the osmotic pressure. It brings out the unrequired substances, dissolved salts, and other harmful elements present in water, which UV and UF filters are not able to do.

A water purifier is necessary for areas having traces of iron or arsenic in their waters. They are not very expensive and come in different models and designs.

ro water purifier
RO means reverse osmosis

What Is An UV Water Purifier

A UV water filter makes use of UV rays or ultraviolet rays. As we all know, water contains various kinds of bacteria, viruses, and other molecular harmful molecular organisms. If they do not get treated properly, it can cause health problems among consumers.

To avoid any health issue, UV water filters have an UV lamp inside. This UV lamp provides ultraviolet light. The ultraviolet light kills all the germs and bacteria present in water. Things make it safe for drinking as well as for other designated purposes. Hence, between UV and UF, UV is preferred more.

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Different Types Of Water Purifiers 

What Is An UF Water Purifier?

An Uf water purifier is the simplest of all water purifiers. It has a single uf filter membrane. The membrane is semipermeable. It allows the solvent to pass through. The larger molecules of harmful foreign substances get drained out of the drainage pipe. It is suitable in areas where the tap water gets adequately treated. The uf filter water purifier has a limited number of designs. Not many people use it now.

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The companies that manufacture it stick to one particular structure as far as all the models are concerned. The uf purification process is the most basic when we are comparing difference between RO UV and UF. They are inexpensive and usually have moderate market demand.

a pot of boiling water on a gas stove
The uf filter water purifier has a limited number of designs.

RO v/s UV v/s UF – Which Water Purifier is the Best?

These are the three main ways of water purification. Reverse osmosis is a relatively new phenomenon. Ultraviolet rays and Ultra-filter technology-these two techniques are well established in the field of water purification. The UV ray water purifiers have a UV ray bulb inside. This kills the harmful microorganisms like bacteria and viruses present inside the water. However, after they are killed they remain in the treated water.

Moreover, UV rays cannot kill the dissolved impurities present in water. In comparison to that, reverse osmosis technology is capable of killing the dissolved impurities by making the flow against the direction of osmosis across a semipermeable membrane. This happens due to the hydrostatic pressure, which is greater than the osmotic pressure.

The Uv filter technology is relatively old. The machines can run without electricity. The Uv filter consists of semi-permeable membranes. This membrane allows the passage of water and retains the microorganisms. All the dangerous substances get eliminated through a drainage pipe. But the filtration is not anywhere as close as the other two.

Hence, the water filters which use Ro and Uv technology are by far the better ones that you can get for your money among the three. The filtration process is much more advanced and kills way more germs, making the water very safe to drink.

uv filter
The Uv filter consists of semi-permeable membranes

Advantages of RO Water Purifier

When we compare ro vs uv vs uf, ro water purifier comes with a lot of advantages. The process of reverse osmosis is scientific. It ensures that the water is entirely free of any dissolved salts that are harmful. The dissolved salts can remain in the water even after the purification process. This can lead to diseases like cholera.

If we compare RO and UV water purifier, RO is useful in eliminating such substances even against UF. The intense hydrostatic pressure makes it possible to extract the dissolved solutes and salts. Ro machines require periodic maintenance. You can do that by contacting your purifier manufacturer. However, you cannot maintain these machines yourself.

UV v/s UF Water Purifier 

An Uf water purifier, on the other hand, is the most economical among the three. Their most significant advantage is that they do not run on electricity. This means that you can have filtered water even if the electricity goes off in your place. This is not possible in case of a ro water purifier or a UV water purifier.

RO water purifiers consist of a motor pump that exerts hydrostatic pressure. In the case of a UV water purifier, the UV lamp present inside needs high-voltage electric current. Thus, if we compare UV and UF, UF is more economical.

RO v/s UV Water Purifier

As far as the UV purifier is concerned, it consumes very electricity. If we compare UF v/s UV, UV is more economical. The UV bulb can operate even if the electric current is not that strong. This cannot happen in the case of a RO purifier. A RO purifier consumes more electricity than a UV water purifier. However, if we compare RO and UV water purifier, RO water purifier is more scientific.

Whatever germ gets killed inside a UV water purifier does not receive further treatment. That means it remains dissolved in the water after it dies. This does not happen in the case of a ro water purifier. The membrane inside makes it sure that the water remains on one side, and everything else remains on another side. Hence, these are pros and cons of RO vs UV.

Related Reading:

Best Water Purifiers in India

Which Water Purifier Should You Buy?

It is clear by now the difference between RO UV and UF technology. All three of them have their respective advantages as well as disadvantages. If you intend to buy a water purifier, you should weigh both the advantages and disadvantages of all and then make a decision.

The nature of the water purifier also depends on factors like the quality of water in your area and the quality of water pressure in your area. It is advisable to have a sound idea about these things before you buy a water purifier.

Frequently Asked Questions

Here we answered most asked FAQs on which water purification method is better: RO, UV, or UF.

1. Which is better: RO, UV, or UF?

RO (Reverse Osmosis) is comparatively more beneficial than both UV and UF. Consumption of RO water is safer.

UV cannot remove dissolved impurities in the water, which is possible with RO. Unlike UV, RO purification removes the dead microorganisms from the water after eradicating them. Not only that, RO water improves the taste of water and works well with the high TDS levels.

UF is more economical as it can work without electricity. RO and UV purifiers cannot work without electricity. UV retains most of the beneficial minerals in the water.

To answer the question ‘Which is better?’ depends on factors such as quality of water, water pressure, hardness, and TDS levels. RO water systems are more suited where there are high TDS levels. UV is suitable where TDS levels are around 500ppm.

2. Is RO better than UF?

The main advantage of using a UF purifier is that it can be used without electricity. This makes it a more economical option than RO. As well as, a UF purifier is best suited where there is frequent electricity issue, as RO purifiers won’t work without electricity.

3. Is UV better than RO?

RO water purifiers are best for hard water or where TDS levels are very high. UV water purifiers are best suited for purifying municipal water or tap water and with low TDS levels.

In addition, the RO water purifier helps in getting rid of heavy metals and toxins, while the UV water purifier is incapable of doing that.

Depending on the hardness, TDS, and PH level of water, the water purifier should be selected. 


We live in stressful times. We live in a world where your decisions have widespread consequences. Choosing the right water purifier technology might sound simple and unimportant. It is, however, as important as every other thing that affects your life. There are health concerns associated with it.

If you get the wrong purifier for your home or your office, both you and your family or you and members of your staff might fall sick. To prevent any such incident, it is essential to have a clear idea and difference between RO UV and UF. A water purifier buying guide can help you in that case.

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