RO Water Purifiers

Water pollution and contaminated water supplies are a problem felt everywhere, not just in the developing nations. Even in industrialized countries, groundwater is often polluted with chemicals and minerals: a detriment to a person’s health and it gives drinking water an unpleasant taste. Many people are now choosing to install water purification systems into their homes to ensure that their water is clean and fresh tasting.

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Some of the more popular water filtration systems include activated carbon filters, metallic alloy filters, and ceramic filters. These three kinds of filters work in essentially the same manner. They are porous materials that trap contaminant in their tiny crevices, allowing clean and filtered water to pass. While these filters are better than having no filter at all, they may not purify water completely. Particles can get through the system of pores and into the drinking water. In addition, once the filter becomes full of contaminants, it has to be changed.

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In recent years, water filtration technology has advanced to the point where home reverse osmosis water purifiers have become available. Reverse osmosis systems have been used for industrial purposes for decades to decontaminate the water supplies for cities, process bottled water, and to desalinate seawater. Reverse osmosis purifying systems can clean water better than most kinds of water filtration systems available.

What is Reverse Osmosis?

In order to understand what reverse osmosis is and how it is helpful in the purification of water, it is important to know the principles behind osmosis. Osmosis is a chemical process in which fluid (i.e. water) moves from an area of high concentration to an area of low concentration through a semipermeable membrane. A semipermeable membrane is a thin surface that has microscopic holes in it that allows particles smaller than the hole to pass through to one side, while keeping particles that are larger than the holes on the other side. When an equal amount of fluid and particles of contaminants are on both sides of the semipermeable membrane, the whole system is balanced and in equilibrium, a state in which the transfer of particles across the semipermeable membrane stops.

Another term for the process of reverse osmosis is hyperfiltration. In reverse osmosis, the semipermeable membrane is used as a filter for contaminants. Here is how reverse osmosis works:

  1. Polluted water is held on one side of the semipermeable membrane.
  2. Pressure is exerted onto the polluted water, forcing it through the semipermeable membrane.
  3. The semipermeable membrane, being full of tiny holes, allows water molecules through, while preventing larger contaminants from passing.
  4. Purified water is collected on the other side of the semipermeable membrane.

In advanced reverse osmosis purification systems, a system called crossflow is used to keep the membrane from clogging. In a crossflow system, water is continuously passed through the membrane, allowing the contaminants to be swept away without clogging the membrane.

In home reverse osmosis purification systems, two kinds of semipermeable membranes are commonly used. The first is called Thin Film Composite (TFC). The second option in home reverse osmosis systems is a Cellulose Triacetate (CTA) membrane. In general, TFC membranes filter water better than CTA membranes because the holes in them are smaller and can capture more foreign particles. The one disadvantage to a TFC membrane is that it can be destroyed by exposure to chlorine in municipal tap water over a period of time. Most reserve osmosis purification systems have an activated carbon filter that removes chlorine to safeguard the membrane.

What Can Reverse Osmosis Filter?

Reverse osmosis is a very effective way of cleaning water, filtering out almost all contaminants that may be in home tap water. Here are some of the things that a reverse osmosis water purifying system can remove, listed by the effectiveness of the reduction:

  1. Removes: Arsenic, Most bacteria and viruses, Chlorine, Fluoride, Odors, Bad Tastes, Heavy metals, Nitrates, Debris, Sediment and Iron
  2. Reduces the amount of: Hydrogen sulfide, Benzene, Other volatile substances
  3. No effective removal: Radon

It should be noted that a reverse osmosis water purifier does not kill bacteria or viruses. In some cases, tiny viruses may pass through the semipermeable membrane and into the purified water if the membrane has been damaged due to prolonged exposure to chlorine. To safeguard against this, most reverse osmosis filtration systems are installed simultaneously with ultraviolet light filters that can kill pathogens.

Pros and Cons of Reverse Osmosis Water Purification

There are numerous pros and some cons to owning a reverse osmosis purification system. One advantage of a reverse osmosis system is that reverse osmosis is better than almost any water purification system for filtering out contaminants and pathogens. Reverse osmosis systems can also render water tasteless and odorless. Purified water also prevents rust and mineral build up in bathrooms, sinks, and pipes. Also, over the long term, reverse osmosis is inexpensive, costing less than 5 cents per gallon to filter. When compared with other filtration systems, it is a bargain.

The biggest drawback with a reverse osmosis purifier is that it requires a lot of water to maintain the pressure required to induce hyperfiltration. Of all the water that passes through a reverse osmosis system, only between 5 and 15% of the water that goes in becomes purified, leaving a tremendous amount of waste water. Home systems are also slow, producing between 15 and 20 gallons of purified water per day depending on the system. Finally, due to degradation of the semipermeable membrane over time by exposure to chlorine, bacteria and viruses can make their way into the purified water. As a result, many people choose to install UV filters along with their reverse osmosis purifiers.

Costs and Brands

For installation in a home, a reverse osmosis purification system can be quite costly. Initially, a homeowner will have to pay for the system and installation that can run between $300 and $5000 depending on the quality and capacity of the water purification system. Also, from time to time, the membrane will need to be replaced. Membranes cost between $100 and $300 dollars. In addition, carbon filters are needed to increase the longevity of the semipermeable membrane. These can cost between $50 and $100.

Finally, most homeowners choose to install an additional UV filtration system to kill bacteria and viruses. These can cost several hundreds of dollars in addition to installation fees. In recent years, another alternative to a house-wide reverse osmosis system is small portable units. These can cost as little as $150 and go up to $500. They can be placed in any room and can produce several gallons of purified water per day. Some popular brands include the GE Profile Reverse Osmosis Filtration System, the Aqua Pure Reverse Osmosis Drinking Water System, and The Tap Master Iron Reverse Osmosis Water Filtration System.

The End Result: Opt for RO

As pollutants in municipal water supplies increase, more people are looking into installing home water purification systems. While there are many kinds, none surpass reverse osmosis systems in terms of filtering out contaminants. For those interested in drinking the cleanest water available, reverse osmosis water purification systems should definitely be considered.

18 Responses to RO Water Purifiers

  1. singaravelu says:

    i want the tamilnadu distbuter contact number

  2. kasi says:

    i need some prices about RO mini water purifiers

  3. harry chauhan says:

    i need a price list of Reverse Osmosis Water Purification. pl send me this on my id.

  4. praneeth says:

    1)Water Dispenser Hot & Cold with Reverse Osmosis System inbuilt
    ( Should be capable of producing 12-15 ltr/day purified water with 7 ltrs.RO Storage tank

  5. praneeth says:

    we have requirment this requiremets in the north different locations

  6. Sanjay Bhagat says:

    After Compliments,

    Could you please forward price for RO Non Electric Water Purifier on the mail ID to cater approximately 150 persons in a residential institute.


  7. vijayalakshmi says:

    i want to know the cost of few brands with ro and uv together water purifiers which can be installed at home and where it is available at chennai india.

  8. Adam M. says:

    While most of the above information is correct, a in home reverse osmosis unit will generally produce more that 20 gallons per day. Most units on the market come with a 50 gallon per day membrane, while others have a 35 GPD, and also a larger one at 100 GPD. There are, in some cases, units where they will have 150 GPD membranes, but these have not yet passed certification.

    Also, the UV filter, which is usually in place after the membrane, is completely useless. One the water has passed through the membrane already, there is nothing more the UV filter can do to help purify the water further. If you want to ensure the purest of water, you need a system that utilizes a DI stage, which will remove whatever has made it through the membrane, but is only required if your source water is terrible to begin with.

    In regards to the waste water, most system will usually have a 3:1 ratio, where 33% of the water going into the system is good drinking water, disposing of the other 67% contaminated water. I have a system that produces 100GPD, and cost me less than $200 for the complete system. I bought my system from Aquasafe Systems and have been enjoying pure water for quite some time now. Their website is and I had done a lot of research before buying a system, and not only did they also have a DI stage on their 6-stage system (which I needed as my source water is horrific), they were also the cheapest in both system, and filter replacements.

    All in all, reverse osmosis is they way to go as not only does it employ the uses of a standard water filter, whether it be under the counter, countertop, or tap filter, it also has the membrane, and usually an additional final filter, possibly two. Normal water filters usually have carbon filters to bind to the contaminants, and my system has two of these before the membrane, and another after (just in case) to ensure that nothing ends up in the final product, ensuring the purest of drinking water.

  9. bhairav raut says:

    pl send me price list of RO water purifier system of various company.

  10. bk singh says:

    Pl tell me price list of various RO water system includingh Aqua Fresh

  11. abdul nazar says:

    please send the contact numbers of Dealer in kerala

  12. mahantesh says:

    please tell the RO waterpurifiers and uv waterpurifiers rates and also both uv&ro waterfiers rates immediately

  13. mahantesh says:

    i need a price list of Reverse Osmosis & Uv Water Purification. pl send me this on my id.

  14. Teguh Iman Djoko Trilaksono says:

    Please send me structure and constructions of reverse osmosis water purification, include the components. These informations we need for our maintenance and (maybe) for repairing so we must know all items.

    Thanks and regards,
    Teguh Iman Djoko Trilaksono

  15. surjeet says:

    i need a commercial purifire of capacity 1000ltr per hour pls send me price list

  16. shiva says:

    i need a price list of Reverse Osmosis Water Purification. pl send me this on my id.

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