RO (Reverse Osmosis) Water Purifiers - Pros and Cons - Homemade (2023)

Last updated on Jan 22, 2023 by Darshan Chana

RO water purifiers are devices that purify water through the process ofosmosis inversa. These types of water purifiers use apartially permeable membraneto remove contaminants from water.

RO (Reverse Osmosis) Water Purifiers - Pros and Cons - Homemade (1)


  • How does Reverse Osmosis work?
  • What is an RO water purifier?
  • How does an RO water purifier work?
  • Parts of a RO Water Purifier
  • What are the types of reverse osmosis water purifiers?
  • Advantages of an RO Water Purifier
  • Disadvantages of an RO Water Purifier
  • RO Water Purifier: Frequently Asked Questions

Dirt molecules, unwanted ions and sediment are restricted due to the presence of the membrane. By purifying water in this way, solid particles, however small, are retained on the pressurized side of the membrane. Whereas, the filtered liquid can pass to the side of the user.

Taking into account the amount ofpollutionthat humans generate daily, food and water must be treated before consumption. That's where RO water purifiers come into play. They remove all harmful substances from the water and always provide pure drinking water.

Reverse osmosis purifiers are in the category ofmost reliable water purifiers. There is a term known asTDSlevelsTotal dissolved solidsThe level is a rating to indicate the concentration of dissolved particles in the water. TObest RO water purifierremoves the TDS content from the water and provides you with thepurest drinking water.

The three types of water purifiers are:

  • UV (Ultraviolet)
  • UF (ultrafiltration)
  • RO (reverse osmosis)

Let's read about the mechanism, types, pros and cons ofreverse osmosis water purifiers.

Recommended reading:RO vs UV vs UF - Water Purifiers

How does Reverse Osmosis work?

RO (Reverse Osmosis) Water Purifiers - Pros and Cons - Homemade (2)

Remember, we studied aboutosmosisin chemistry and biology classes?

The classic definition of osmosis would be the natural reaction of liquids when moving from an area of ​​lower concentration to an area of ​​higher concentration, being separated by asemipermeable membrane. Take the relationship between soil and water, for example. The water seeps into the ground, just like osmosis.

osmosis inversaIt is the opposite of osmosis. In this case, the liquid is transferred from a region of higher concentration to one of lower concentration. This overcomes the natural movement of fluids.

But how does this happen? The answer isfortaleza.

(Video) 5 Problems With Reverse Osmosis Water Filters

Let's say you have a path for fluid flow divided by a semi-permeable membrane. One side of its path is formed by water with salts and minerals. While the other side has cleaner water or no water. When force is applied from the high concentration side, purified water penetrates. This happens because of the semi-permeable membrane and the direction from which the pressure was applied.

Precisely the same functionality is used inreverse osmosis water purifiers.

That's why the best reverse osmosis water purifiers consistently deliver clean, drinkable water. All solids, undissolved or dissolved, have restricted entry to the other side due to high levelmembrane engineering.

What is an RO water purifier?

RO (Reverse Osmosis) Water Purifiers - Pros and Cons - Homemade (3)

Unlike other filters that work and purify using high frequency light or additional compounds, the RO purifier thrives in amembrane. The membrane contains pores that are no more than0.0006 microns in size. These pores are very helpful in restricting impurities.

It doesn't matter if it's mud, salt, dust or even grass. In fact, lead molecules,arsenic, and cadmium also stay away.

Do you live in a region where water pollution is high? have yourTDS testiclesDid it indicate higher than average hazard levels? An RO water purifier can provide the necessary security for you and your family in these cases.

If you consume these impurities, the side effects will not be instantaneous. Rather, these contaminants will spread in your body over time. Eventually, you will be diagnosed with serious diseases such ascancer or irreparable organ damage.

Regular water purifiers also clean water, but only up to a limit. If your water source has aTDS Classificationin the thousands, your standard water purifier will be ineffective.

You should be looking for an RO water purifier that removes the clutter and replenishes the mineral content. EITHERbest RO water purifierwith characteristics of aTDS controllerit's amineralizerand you need

Recommended reading:How to check the TDS of water

How does an RO water purifier work?

RO (Reverse Osmosis) Water Purifiers - Pros and Cons - Homemade (4)

If you know the necessary water filtration procedures, you'll also know how restricted impurities are removed. You must clean the filter before manually allowing water to pass through again. If you don't clean it, the sediment clogs the membrane and a small amount of water can get through.

That's where RO water purifiers come in handy. They consist of a cross filtration system. Two outlets are allocated for each RO water purifier. One end is for the water to flow from your side. The other outlet removes impurities that are rejected by the semi-permeable membrane.

After the purifier is turned off, there will be a suction action at the reflux outlet. This sucks up any contaminants that have been restricted by the funnel. does he guess? The system is so effective that rejected water can be detected with more than90% impurities.

Don't be one of those who want to re-filter this water and blow up the system. If the amount of contaminants is high, your system can become stressed and stop working.

The smart choice is to use this water to mop the floor or clean the bathroom.

The RO filter will stop any particle that has a molecular weight greater than 200. Whether it is a mineral, an ion or any other sediment, it does not matter. The molecular weight of water is only 18. You can imagine the level of caution RO filters add.

You must take additional measures to prevent the passage of sodium ions. Since their weight consists of single digits, you'll need specialized filters to keep them out. Think about it, if you had a groundwater system installed in your home, reverse osmosis purifiers could be a savior.

(Video) Is Reverse Osmosis Water GOOD FOR YOU? Live Stream Replay

Due to its impeccable water cleaning ability, water poured through a reverse osmosis filter will measure less than seven on the pH scale. consider thisSlightly acid and 100% suitable for human consumption..

Recommended reading:9 Best Water Purifiers in India 2022

Parts of a RO Water Purifier

Four parts of an RO water purifier that you should know about are mentioned below:

1. Inlet valve

RO (Reverse Osmosis) Water Purifiers - Pros and Cons - Homemade (5)

This fits right next to you like a water fountain. There is a visible tube going to the sediment filter (that you can't see).

2. Sediment filter

RO (Reverse Osmosis) Water Purifiers - Pros and Cons - Homemade (6)

Impurities that can travel further and clog the RO system are restricted here. Remember that if there are solid particles in the water, the sediment filter has stopped working.

3. Pre-activated carbon filter

RO (Reverse Osmosis) Water Purifiers - Pros and Cons - Homemade (7)

chlorinecan be found in everymunicipal water fountain. The problem remains in the sensitivity of the RO membrane to chlorine. Exposure to chlorine can render the reverse osmosis filter ineffective. Pre-activated carbon filters work in unison toremove all traces of chlorine.

Additional carbon filters are present after the RO membrane. They were placed to break down any undesirable odors that might form during filtration.

4. HI membrane

RO (Reverse Osmosis) Water Purifiers - Pros and Cons - Homemade (8)

It is the final filter/membrane that removes existing impurities that have passed through thesedimentmipreactivated carbon filters. Due to the microorganisms and bacteria that still manage to enter, it is necessary to connect additional filtration systems at the front.

5. Ultraviolet filters and ultrafiltration

RO (Reverse Osmosis) Water Purifiers - Pros and Cons - Homemade (9)

The intimidating action of the UV and UF filters kills any existing bacteria or microorganisms, thus purifying your water to the maximum.

By now, you know how well reverse osmosis purifiers work to clean almost allmineralsof the water There would be an undoubted sacrifice of healthy minerals. The water is supplied withmineralizersin its final stages to stabilize this loss of essential minerals.

The on/off switch is used to start or stop the flow of water in the tank. Pressure is directed towards the membrane when the device is turned on.

On the other hand, when the switch is off, the force is directed outward. This removes contaminated water and impurities from the other outlet.

Recommended reading:UV (ultraviolet) water purifiers: pros and cons

(Video) Is Reverse Osmosis Purified Water Really Necessary for Hydroponics?

What are the types of reverse osmosis water purifiers?

India offers two generic RO water purifiers as per the country's health requirements and regulations:

1. Under Sink RO Water Purifier

RO (Reverse Osmosis) Water Purifiers - Pros and Cons - Homemade (10)

As the name suggests, this water purifier is installed under the sink. The proximity to theSinkmakes it easier to use and quicker to react.

These types of filters are additionally equipped with awater storage containerwhich is pressurized by air. Do you want your maximum capacity5 litersWhether it's reached or not, the built-up pressure helps transfer the water to the outlet.

these purifiersdon't take up much space. The best part is the installation area. Even better, the fact that it's under the sink saves you valuable outdoor space.

All contaminated water can be redirected to another tank or pipe according to your needs. You can connect it to your washing machine, garden hose, or even your company's sewage outlet.

Most importantly, because the tank is located under the sink, the direction of the pressure favors the force of the water. not the casewall mounted RO water purifiers.

2. Wall Mounted RO Water Purifier

RO (Reverse Osmosis) Water Purifiers - Pros and Cons - Homemade (11)

These systems are not concealed and highly visible to the user, but consist of a complete compact unit that can be mounted on the wall.

Another advantage is the ability tostore up to 10 liters of water, for which additional equipment is required.

The best part is that both water purifiers will allow you to access your stored water.despite a power outage.

Advantages of an RO Water Purifier

  • ultraviolet water purifiershelp kill bacteria and other microorganisms, but cannot eradicate theirdead bodies. RO water purifiers, on the other hand, kill and remove all contaminants.
  • in the heavy yearaslead, cadmium, iron and arsenicthey filter out of the water. This is only possible due to theSize from 0.0005 to 0.0007 micronssemi-permeable membrane.
  • ATDS controller (Total Dissolved Salts) or a mineralizercan be added to enrich water with minerals. Other water filters do not have such refill arrangements.
  • Compact in storage case.
  • Even the frequency of maintenance checks is reduced since the air pressure system automates the cleaning of the hopper.
  • 100% safe and purified wateris available to drink 24/7.

Disadvantages of an RO Water Purifier

  • High pressure is a mandatory requirement due to the automated extraction of contaminated water. unfortunately, thatrejected waterit is usually wasted.
  • Electricityit is also a compulsion. The constant purification of the inlet water cannot work without electricity. All you can access is already clean, stored water.
  • 50% of the total water used in the process is rejected due to contaminants. This is not a resource friendly option.

The facts state that thethe benefits of an RO water purifier far outweigh the disadvantages. If you're looking for a healthy source of drinking water, you have to make some sacrifices. So much knowledge about RO water purifiers should be enough to help you search for the ideal attributes. Go ahead and take your pick and let us know if this guide influenced your decision.

Recommended reading:9 Best Water Purifiers in India 2022

(Video) The Pros and Cons of RO Water Filters

RO Water Purifier: Frequently Asked Questions

What is the electricity consumption rate for RO water purifiers?

Not much. It is considered almost negligible on your electricity bill. Keeping the system on for 40 hours will consume 1 unit.each 1 unitpour at least400 to 500 litersof purified water.

Is the maintenance cost of RO water purifiers too high?

No way! You would need to have your water purifier serviced every3 to 4 months. Due to the pressurized air purification system, it usually cleans the sediment that has leaked out. If you get an RO water purifier from a trusted brand, you will rarely need to clean the filter yourself. For these reasons, the maintenance cost is low.

How much should I pay for a good quality RO water purifier?

You will get water purifiers ranging from 7,000 to 50,000 INR. Consider12.000 a 25.000 INRas an ideal rate to get a top-notch water filter. With proper care, it can last as long asten years.

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Sourav Roy


Sourav Roy understands the inconvenience people experience after purchasing a product based on what little information they find or what an anxious trader tells them about it. So, to save them the trouble, he spends his time at Homeliness, working with an experienced team to test and evaluate new products, choosing the best on the market.

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