does reverse osmosis remove e.coli

Clover Dane

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Does Reverse Osmosis Remove E.Coli


Drinking water is essential for living and should safe for health. Usually, the city water comes with the qualities of filtration and purification. But water contaminations still present in it. We have to ensure that drinking water is free from contaminants. There are large varieties of pollutants, including chemicals and bacteria. Now you may think about does reverse osmosis remove e.coli.

The most straightforward answer is yes. This system is the most efficient in the removal of bacteria, particularly E.coli. The bacteria are harmful because it causes serious health issues. One of the prominent bacterial contaminants in the water is E.coli. For the removal of e.coli bacteria from water, the reverse osmosis system is the best one.

How Does RO Remove E.Coli?

The starting process of reverse osmosis includes the adding of water pressure. This water pressure moves the water through the membrane. The membrane is responsible for the production of filtered water. This reverse osmosis system consists of three stages. After all stages of the system, it ensures the removal of E.coli. Below are the main stages of the system:

The first stage of the RO has specialized in eliminating all the large solids from water. It enables the removal of many waste substances. After the early stage, the system ensures the production of clean water.

The second stage is the best for the removal of the smaller size chemicals. The small chemicals include lead, chlorine, etc.

 It ensures the pleasant taste of water without any odor. The first & second stage removes the little number of bacteria.

This RO system has the best third stage that has specialized for the eliminating of bacteria. This stage has the quality for the removal process of bacteria.  In this stage, the system also removes the viruses. It ensures the removal of different viruses and bacteria from the water.

The membrane of this stage has very tiny pores. The size of these small pores is 0.0001 microns. The motive of these small pores is to eliminate all sorts of small size bacteria & viruses. As a rule, the small pores are great for the removal of bacteria.

The size of the bacteria is between 0.4 to 1 micron. Most of the viruses have a size of between 0.002 and 0.4 microns. The sizes of both viruses & bacteria are bigger than the pores of the membrane. Therefore, the membrane will never allow the passing of the bacteria like E.coli.

After all the stages, the system ensures to filter out all types of bacteria & other chemicals.

Does reverse osmosis Remove E.Coli

Why Remove E.Coli from RO Water?

In reality, E.coli is present in the digestive system. The digestive system includes both humans and animals. The bacteria will not harm the body. If the bacteria ingested from outside, then it causes some health problems.  

The E. coli O157: H7 is the most harmful strain of the bacteria. The ingestion of this bacterium causes many health problems. It causes diarrhea and vomiting. Some other symptoms are severe that include fever, seizures, bleeding, etc.

The E.coli strain of STEC and Shiga produce toxic bacteria. This sort of bacteria’s strain may harm the lining of the intestine. Besides the issues of the digestive system, it also causes urinary tract infections. According to 75 to 95% of reports, the E.coli infection is severe and may become the reason for urinary tract issues.

Now with the above information, you all knew about the health issues by E.coli. When your water is with E.coli, it means that the water contains animal waste. The water with the contaminants of animal waste is harmful to health and the body. The animal waste contains E.coli. If the water in the US includes bacteria, then that water is unfit for human drinking.

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Other Bacteria that Reverse Osmosis Removes

The RO system removes many other bacteria. With e.coli, the other bacteria also cause health problems. The following are some bacteria that reverse osmosis easily removes. The removal of these bacteria is necessary for safe drinking water.

Salmonella is the reason for bacterial diseases. The strains of the salmonella are very aggressive and cause typhoid fever. The signs of this disease are severe that includes fever, chills, headache, etc.

The reverse osmosis removes salmonella from water.

When you drink water with contaminated feces, then it causes shigellosis disease. When this sort of water continuously drinks, then it creates severe health issues. The membrane of the RO enables the removal of the Shigella bacteria easily. Another bacterium is campylobacter that can cause intestinal infection. The RO system can remove all bacteria very well.

Besides E.coli and other bacteria, the system enables to remove the protozoa and viruses. The famous protozoa include Giardia and Cryptosporidium. These protozoa are commonly present in the water. This filtration system is also useful in removing viruses from the water. Viruses are the reasons for many health problems such as hepatitis A etc.

Consequently, it is necessary to filter the water. The filtered RO water is free from viruses and bacteria.


 In conclusion, the presence of E.coli in the water is not great. It is not safe for health. The presence of bacteria indicates that water contains many contaminants. Those contaminants are harmful. Even the small amounts of E.coli cause many health problems. If your water system is very efficient, then the contamination may present there also.

Protection from health problems requires an efficient water filtration system. The investment in a reliable and effective filtration system is very worthy. The RO system is one of the best ways to clean and filtered water.

Does reverse osmosis remove e.coli? The answer is yes. RO removes E.coli from the water. The membrane of this system is very helpful in the elimination of E.coli. Besides E.coli, this system can also remove other types of bacteria.

The output filtered water is free from all bacteria. The RO ensures to always produce safe water for your drinking. Most people prefer this system for its effective removal of bacteria.