What Contaminants does Reverse Osmosis Remove from Water?

By | March 14, 2017

So you have decided to buy a water filtration system for your home. Your friend might have suggested that you buy a reverse osmosis machine for filtering water. While reverse osmosis doesn’t guarantee a solid 100% protection against all types of disease-inducing particles and microbes that are usually found in water, but with so much contaminants present in our surroundings today, as well as the continuing evolution of microbes, having one is probably the best deal you can find. With all its components working to the optimum condition, it can provide up to 95-99% protection from pyrogens, salts, and other contaminants in your drinking water. Surely, this is one of the best water filter systems that are readily available in the market today.

Below are the most common contaminants that reverse osmosis water filters for home protect us from – those that belong in the 99% that do not pass through the semi-permeable membrane.

Dissolved Salts

These abound in sea water, and are the primary reason why it does not quench our thirst. When salty water enters our mouth and into the digestive system, the salt gets absorbed into our bloodstream through the walls of small intestine. Once salty blood has begun to circulate, every cell that it reaches will lose water inside of it. Guess why? Yes, that’s right. Through the process of osmosis, water inside the cells will tend to go out in an attempt to balance out the irregularity in concentration. That is why salt water will never quench our thirst.


These are substances produced by microbes that cause our body to have fever. While fever is a natural body reaction meant to combat infection, but it causes other bodily functions to slow down. As a consequence, you wouldn’t be at your best to come to work or study. That is the downside of fever.


If you have something to blame for your fever, these are it. There are numerous microorganisms found in a mere drop of unfiltered water. Although not all microbes are bad, and cause us to get sick, but a good number of bacteria does. That is why they have to be filtered. Thankfully, most of them have bodies that are relatively bigger than the holes of the semi-permeable membrane.

Other microorganisms, however, have bodies that are too small, thus they can fit through the holes, and penetrate to make it to the product water.  They are part of the 1% that can pass through the RO semi-permeable membrane.


These are homogeneous, non-crystalline particles that have large molecules. These include gels, emulsions, and sols. One of the troubles of ordinary filtration methods is that they cannot separate these substances from water. These can be very persistent, and would not be separated even by centrifuging.

RO system succeeds though in removing them from water due to their large molecules.

Other Particles

Water is called the universal solvent, for it can dissolve majority of particles, including metals and other organic compounds. Thankfully, most of these have a molecular weight greater than 200, thus get blocked from passing through the semi-permeable membrane. Water has a molecular weight of 18 that is why it is capable of passing through the membrane.

Considering all these substances that can be filtered by a reverse osmosis system, we can safely say that it is one of the most effective filtration means that is available in the global market today. Get one, and have a contaminant-free drinking

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