What impurities do RO water purifiers remove from water

2022-04-01 01:53:18What impurities do RO water purifiers remove from water
What impurities do RO water purifiers remove from water

One of the most common and effective ways to purify water is reverse osmosis, which is sometimes also known as RO. RO purification is notable for removing even the tiniest contaminants from water while also converting high TDS (salty tasting) water into sweet-tasting drinkable water. Although there are numerous advantages to using an RO water purifier, there have recently been some concerns regarding RO technology eliminating critical minerals from drinking water. Let's solve the puzzle and understand the truth!

Depending on your location, you may have access to a variety of water sources. Rainwater, according to the WHO, has low salinity and mineralisation compared to groundwater, which can be overly mineralised at times and varies depending on the region. To put it another way, your groundwater may contain a variety of minerals. While some of these minerals are good for your health, others might be dangerous.

Although water contains numerous minerals that are beneficial to the human body, ingesting too much of it can lead to a variety of ailments. Elevated sodium levels, suspended particles, and bacteria are removed by an effective water filter, but vital vitamins and minerals are retained. With so many manufacturers in the water filtration market these days, it's tough to know which ones are good, which aren't, and which fulfil the minimum requirements.

Water filters and purifiers both operate on the same principle of mechanism. They take up polluted water, filter out contaminants such as sediments and microorganisms, and then deliver clean and purified water. There is one significant distinction between the two, however: a RO purifier can eliminate viruses and germs that filters cannot. To eliminate or catch viruses, some purifiers utilise chemicals, while others use an electrostatic charge.


We receive water at our home through various sources and among them, rainwater has low salinity and mineralisation.

It is a myth that RO water purifiers can eliminate minerals from drinking water.

Although there are numerous minerals present in the water, consuming too much of it can lead to a variety of ailments.

However, water filters and water purifiers operate on the same mechanism, they both are different. A purifier can remove viruses and germs which a filter cannot

What is Reverse Osmosis?

  • Reverse Osmosis Systems use a semi-permeable membrane that reverses the flow of water in a natural osmosis process, allowing impure water to become free from bacteria and viruses resulting in pure and clean water. Pre- and post-filters are frequently used in conjunction with the reverse osmosis membrane.
  • The pore size of a reverse osmosis filter is around 0.0001 microns.
  • RO Systems are extremely effective at removing protozoa (such as Cryptosporidium and Giardia);
  • RO is also effective in removing bacteria (such as Campylobacter, Salmonella, Shigella, and E. coli); and viruses (such as Hepatitis A, Enteric, Norovirus, and Rotavirus); and viruses (such as Enteric, Norovirus, Hepatitis B, and Rotavirus);
  • RO can help in removing typical chemical pollutants like TDS (metal ions, aqueous salts), such as sodium, copper, chloride, chromium, and lead, as well as reducing arsenic, radium, fluoride, sulphate, magnesium, nitrate, calcium, potassium, and phosphorus.

Different types of impurities found commonly in drinking water

The sort of pollutants found in your drinking water is mostly determined by the water's source and delivery medium. Lakes, rivers, bore wells, harvested rainfall, piped municipal corporation supplies, water tankers, and other sources of drinking water are the most frequent.

Water quality, contaminants such as toxic pollutants, chemicals, and biological impurities such as bacteria and viruses, as well as hardness, are all affected by the source of water.

The most common types of impurities found in water are:




sand and mud or un-dissolved solids

River, borewell, or piped water when pipes are damaged

Muddy or turbid in appearance

Sodium & Potassium or dissolved inorganic salts 

Borewells and seawater

Salty or brackish taste

Calcium & Magnesium or dissolved inorganic compounds

Borewells and river water

Hardness and scale formation

Organic compounds

Lakes and ponds

Foul smell or bad odor

Disinfectants like Chlorine

Municipal piped water supply

Bitter taste

Bacteria & viruses or biological impurities

Piped water when pipes are damaged, water tankers

Biological contamination, waterborne diseases


When compared to water from borewells, water from lakes, rivers, and harvested rainwater usually has a lower TDS (Total Dissolved Solids). TDS levels in borewell or groundwater are typically high, and dangerous chemical impurities such as lead, arsenic, and other contaminants may be present. Biological contamination is more likely in a piped water supply or water held in tanks (if the pipes are damaged or the storage tanks are not cleaned).

What do RO water filters remove?

RO Water purifiers can be quite successful at removing a variety of contaminants from water, but what contaminants they remove is dependent on the type of filter you use. There isn't any water filter that can remove every single impurity from water, however by combining various water purifying treatment methods you can create a filtering system that offers you nothing but fresh and pure water.

Physical filtration and active or chemical filtration are the two major modes of operation for water filters. The majority of filters combine these two methods: an "active" filter alters the contaminant in some way before physically filtering it out of the water. You can remove practically everything from your water by combining these sorts of filters with one or more different treatment procedures.

Remove hard water

Technically speaking, if you want to remove hardness from your water, you’d want a water softener, not a water filter. Rather than filtering out the hardness minerals of calcium and magnesium, a water softener exchanges them for sodium ions. This is what makes your water soft and eliminates limescale and other problems.

Removing TDS, sand, silt, and sediment

Dirt, silt, sand, and sediment can be removed from the water through a Sediment filter. Large particles can readily damage more delicate water treatment devices like reverse osmosis membranes, hence sediment filters are included in most types of water treatment systems. To remove sediment, you can use either a backwashing filter or a cartridge filter, and while each has its own design, they both work in the same way: water passes into the filter and through some form of filtering media, such as filtering sand or pleated polyester. Because the larger silt particles are unable to pass through the filter, they get trapped inside. The water that is received on the other side is cleaner.

RO & UV filters

You'll almost always require an active or chemical filter to remove pollutants and ions that have dissolved in your water. The sediment filtering medium has been treated in some way such that it induces a change in specific impurities when exposed to untreated water. The filter can physically trap and keep impurities once they've been replaced, removing them from the water supply. Active filters come in a variety of forms, from granular activated carbon to bone char to ion exchange, and each method is optimal for a specific water issue.

Removing chlorine and chloramines

The most common pollutant that consumers want water purifiers to remove is chlorine. To destroy bacteria and other germs, many municipal water treatment systems include chlorine and a related chemical called chloramine as disinfectants. Although these compounds are normally effective disinfectants, they might stay in the water supply. Chlorine can make water taste and smell terrible, and it can cause skin irritation in certain people. In water, chloramine has a similar impact and can harm fish and other marine species. These disinfectants are removed by various types of carbon water filters.

Remove pesticides and other chemicals

A RO filter is one of the best water filters for removing pesticides and other contaminants because of its efficacy in removing organic molecules. Also effective is catalytic carbon, which is a form of activated carbon. Many pesticides, volatile organic compounds (VOCs), arsenic, and silt are attracted to and retained by these filters.

Key Understanding:

RO is a semi-permeable membrane that reverses the flow of water from a more concentrated solution to a diluted solution.

Ro can help remove protozoa, bacteria, viruses, lead, arsenic, and other chemical pollutants and biological contamination.

Sediment filters in RO can remove sediments by a backwashing filter or a cartridge.

The presence of carbon filters can help remove chlorine and chloramine, volatile organic compounds, pesticides and more.

RO can even make hard water soft.

Best RO water purifiers to choose from:

Pureit Classic Nxt ( RO + MF) Water Purifier

The Pureit Classic NXT RO + MF Water Purifier provides guaranteed safe and fresh water at an affordable price. This water purifier is ideal for your kitchen because it has a 7-litre pure water storage capacity and a space-saving, appealing design. It contains a six-stage purification system that can purify water to a TDS level of 2000 ppm.

It's tasty and safe too. Now you can safeguard your family from diseases from germs, viruses, cysts, and dangerous chemicals such as pesticides, lead, mercury, and other harmful substances. With our best-in-class purifiers, hassle-free installation, rapid servicing, and low maintenance expenses, you can have a pure experience. It's the most affordable Pureit RO water purifier.

Pureit Copper+ Eco Mineral RO+UV+MF

Pureit Copper+ Eco is an innovative water-saving purifier that improves the health of your family by combining current technology with traditional goodness. Its 7-stage RO+UV+MF purification process cleanses water while also charging it with copper goodness thanks to its exclusive Copper Charge Technology.

It is equipped with Eco Recovery Technology, which provides efficient purification while saving you a lot of water as compared to other RO systems. It reduces reject water to less than one glass each glass of filtered water, compared to other ROs that waste up to 2.5 glasses for a glass of purified water.

Pureit RO Water Purifier (Advanced Pro Mineral RO+UV)

The new Pureit Advanced Pro RO is mineral-rich, and it uses 100% RO + UV purity levels to provide 100% safe and pure water. To make water more healthful, Pureit Advanced Pro adds important minerals like calcium and magnesium. The Pureit RO Advanced Pro guarantees that the water is completely safe and pure.

This water purifier removes dangerous viruses, germs, chemicals, and heavy metals with a 6-stage RO + UV purification process.

Pureit Marvella Eco Mineral RO+UV+MF

The Pureit Marvella Eco Water Saver is a multi-stage water filter with advanced water-saving technology. Its Eco Recovery Technology ensures efficient filtration while saving you a lot of water as compared to other RO systems.

It is equipped with Eco Recover Technology, which provides excellent purification while saving you a lot of water as compared to other RO systems. It reduces reject water to less than one glass each glass of filtered water, compared to other ROs that waste up to 2.5 glasses for glass of purified water.

Which of these a water purifier cannot do?

To answer your question "which of these a water purifier cannot do" below we have listed some points :

  • Generate water: A water purifier cannot generate water out of thin air. It requires a water source to purify, such as tap water or a natural water body.
  • Remove all types of contaminants: While water purifiers are effective at removing many common contaminants like bacteria, viruses, sediment, and certain chemicals, they may not be able to remove all types of contaminants. For example, some water purifiers may not eliminate certain volatile organic compounds (VOCs), heavy metals, or specific dissolved chemicals.
  • Treat large quantities of water quickly: Depending on their size and capacity, water purifiers may have limitations in treating large quantities of water quickly. It can take time to filter and purify water, especially for smaller or slower purification systems.
  • Change the taste of water: Water purifiers primarily focus on removing impurities and contaminants from water, but they may not alter the taste of water significantly. If the taste of your water is affected by minerals or other substances, a water purifier may not modify it.
  • Work without a power source: Many water purifiers require electricity to operate efficiently. They may have pumps, filters, or other components that need power. In the absence of electricity, the purifier's functionality may be limited or compromised. Check out pureit electric water purifiers.
  • Remove certain dissolved substances: Some water purifiers, particularly those with basic filtration methods, may not be effective at removing certain dissolved substances like dissolved salts, minerals, or gases. These substances may require specialized treatment processes like reverse osmosis or distillation.

It's important to consider the specific capabilities and limitations of a water purifier before making a purchase. Different purifiers use varying technologies and have different target contaminants. Assess your water quality and purification needs to select the most suitable water purifier for your requirements.


Only Reverse Osmosis water filtration technology can remove the harmful elements from your drinking water, as well as other toxic heavy metals and compounds like arsenic, lead, and aluminium, among others. These harmful compounds have been linked to a variety of major health conditions, including brain damage, seizures, nausea, and reproductive disorders.

Essential minerals like calcium and magnesium, which are naturally found in your water, can be consumed in reasonable quantities.

Pureit goes above and beyond in supplying its customers with 100 percent safe drinking RO water. Our RO water purifiers include a mineral cartridge that replenishes key minerals like calcium and magnesium in RO filtered water.