Reverse Osmosis Water Filter

Reverse osmosis (RO) has become a common home water treatment method for drinking water that might be contaminated.

The method of purifying water by reverse osmosis is used by many people these days, to simply purify their water and remove salts and impurities which would result in improving the taste and odor of the fluid. Reverse Osmosis rejects bacteria, proteins, sugars, particles, and dyes that have a molecular weight of more than 150 to 250 Dalton.

How Reverse Osmosis Water Filters perform

Small reverse osmosis water filter systems have all their components mounted on one single skid. Larger commercial RO systems will need some interconnect plumbing from the feed water tanks. If the water feed pressure is less then 45 PSI, a Booster Pump would be needed with the Reverse Osmosis System.

Typically, a good reverse osmosis water filter would require pre-treatment- such as a water softener to remove hardness, carbon filter(s) for contaminants and post water treatment- such as a polishing carbon filter, resin bed or ion exchange filter etc.

Reverse Osmosis is not limited to pure water; it can also be used to purify fluids such as glycol and ethanol, which pass through the reverse osmosis membrane, while rejecting contaminants from passing through. However, the most common use for the reverse osmosis technology is to purify water.

The reverse osmosis process requires a driving force to push the fluid, such as feed water, through the RO membrane. The most common driving force is pressure from a booster pump. Without the proper pressure, if a person is looking for a speedier water filtering than the drip of the carafe, they may not get it with RO.

There are manufacturers who add some useful features such as an automatic membrane flush which would periodically clean the membrane, and pressure gauges which help the user determine how effectively the RO unit is operating, and a procedure called sanitizing that would kill any bacteria present in the system.

Reverse Osmosis Filters: when to change them

There’s no set timeframe on when the RO filters need replacement. Compare it to a light bulb that would last between 6 months to a year. You can’t wait until the system, as a light bulb, stops functioning. So when the recommended time for change arrives, replace the filters. A water system professional with access to the water analysis and the water use rate would easily be able to determine when filters and RO membranes need replacement, although the contaminant concentrations may have not increased.

Reverse Osmosis Membranes would typically last for one to three years, and some for as long as seven years, it all depends on membrane type, operating conditions and pre-filter performance. Most system require you to replace the particle sediment and carbon pre-filter every six months, and the post carbon filter once a year.

Another issue is the Faucet. Many under the counter filters, require a separate faucet for dispensing of water and this can be very slow if not maintained correctly. If the feed water is not too pure to begin with, then the filter and membranes would clog quickly, so some good pre treatment may be needed.

To sum it all up: Reverse Osmosis provides pure filtration for drinking water, it’s now being marketed for home use, while using the same process as used in many major desalination plants. Reverse Osmosis, is also known as hyper filtration, and it’s one of the finest filtration methods known.

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