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How Do Reverse Osmosis Water Filters Work?
S Joseph
When trying to understand the concept of reverse osmosis water filtration, it is important that one first understands what ordinary osmosis is. Osmosis is the diffusion of a solvent through a selectively permeable membrane. The solvent passes from low solute concentration through the membrane to solution with the higher solute concentration. The process sounds complex although like many scientific processes, it can be easier to understand when it is in practice.
The human body is the perfect place to begin looking at the process of osmosis and thus take our first step toward understanding reverse osmosis. Osmosis is the primary means by which water is transported for use in the human body. The process of osmosis is the way that water is able to enter and exit cells. Effectively, equilibrium is reached between the concentration of water within the cell and in the blood. This application of osmosis is extremely functional although the process of reverse osmosis has become attractive for the purpose of water filtration.
Essentially the most significant difference between normal osmosis and reverse osmosis lies in pressure. To enable reverse osmosis, artificial pressure is applied to a quantity of polluted water. The pressure that is applied must be in excess of that which allows regular osmosis. This pressure forces the dirty water to pass through a semi-permeable membrane which traps undesired pollutants and allows only pure water to pass through. The successful application of reverse osmosis has realized new levels of water purity and more importantly, the technology is applicable to a variety of scales for use. In fact, http://www.osmosis1.com reports that reverse osmosis systems can now be packaged for use in everything from city water supplies to in home water coolers. Furthermore, such home coolers have shown to be competitive in cost comparisons with their conventional water filtration counterparts.
So far industry has proven that reverse osmosis can be used in desalination and also for the purification of effluent, grey and brackish water. These applications appear to be a bastion of hope for a world that is clearly struggling to match the demand for water from a growing population.
The author is a regular contributor to http://www.osmosis1.com and permission to reproduce this article is given only on the basis that all links remain active and intact.
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