How does Reverse Osmosis Water Purification Work?

Reverse osmosis water purification works by using a membrane that has pores small enough to capture contaminants while allowing water molecules to pass through. Molecules of harmful substances are thus separated from the water and held back by the membrane. Current systems are also equipped with self-cleaning systems that push contaminants away from the semi-permeable membrane and into a dedicated drain pipe. This process is called crossflow; the water moving through the pipe forces contaminants trapped in the membrane downwards where they will exit through the drain and be disposed of safely.

Advantages of Reverse Osmosis Water Purification

Reverse osmosis is one of the best filtration systems in the world today; it is capable of removing a number of potentially harmful substances such as arsenic, selenium, silver, barium, cadmium, radium, mercury, lead, viruses, bacteria and many others. It can also effectively eliminate foul taste and odor in water. 

Another advantage of using a reverse osmosis water purification system is its cheapness to operate and maintain. The cost of producing 1 gallon of filtered water using such a system will only amount to approximately $.05.

Kinds of Reverse Osmosis Membranes

Reverse osmosis membrane comes in 2 types namely: Cellulose Triacetate (CTA), and Composite of Thin Film (aka TFC). TFC membranes are more effective in capturing hazardous molecules than CTA membranes. On the downside TFCs are less durable and can easily be damaged by chlorine.

Types of Water that the System can Treat

Not only is the system ideal for potable water, but also to water that has not undergone any form of filtration; such of these are the ones that are sourced directly from wells, rivers and lakes. In fact, water experts strongly recommend the use of reverse osmosis water purification systems in places that are serviced by untreated water; such systems will only be entirely effective when used with other filtration systems.

The Disadvantages You Should Know about

Although reverse osmosis water purification unarguably is highly effective in capturing contaminants, it is not a complete filtration system since it is not designed to contain organic compounds. Thus, it needs to work in combination with other systems such as ultraviolet filters, sediment filters, and carbon filters to ensure that users are adequately protected.

Another disadvantage with such systems is slow filtration time since the reverse osmosis process run against natural osmotic flow. As a result, current home systems can only produce a daily maximum of 15 gallons of filtered water. In addition, the current output input ratio of home reverse osmosis systems is 1 gallon of purified water produced per 3 to 10 gallons of unfiltered water. Also, the semi-permeable membrane which is the primary component of such systems is fragile and would decay or rot if not installed with a sediment and carbon filter.

A reverse osmosis water purification system is a good addition to homes or facilities that have stringent water quality requirements. When used in combination with other filtration systems, it can provide perfectly safe drinking water.