Today, more and more people in highly-urbanized places are choosing reverse osmosis (known also as R/O) to purify their water. However, there are people still in the dark about water purification, filtration, and the like. The following are the answers to some frequently-asked questions on reverse osmosis.

What is reverse osmosis?

A. Reverse osmosis is a process where water is stripped of minerals and other impurities by forcing it to pass through a semi-porous membrane using pressure. It is the opposite of osmosis, the natural process where water seeps through a semi-porous membrane where liquid is of higher concentration.

What comes out of the reverse osmosis process is fresh, clean water ready for use.

Q. How does industrial reverse osmosis differ from those units used in homes?

A. None, except that the materials used are of industrial strengths for bigger institutions. The big systems usually use spiral wound membranes in high pressure containers. These provide larger surface areas.

Q. Is any pretreatment required?

Ideally, yes. Water should have very low silt (solids) content to keep the membranes from plugging up. This is done by way of pre-filters that remove these solid sediments. 

Other TDS (total dissolved solids) like chlorine have to be removed by active carbon filters because it attacks the main R/O membranes. Some, like calcium and magnesium, chokes the membranes, and have to be removed at pretreatment.

Q. How much pressure is required to purify water?

The pressure needed is dependent on the concentration of the sediments and salts on the feedwater (the water to be purified), which is in turn dependent on the pressure from the source.

Q. How pure will the water be?

Purity is determined by two things. One is the reject ratio of the membrane which is pegged at 92% up to 99.5%. The other is the type of TDS (total dissolved solids) present in the feedwater.

However, through length of use, the efficiency (and life span) of the membranes shortens, and leakages occur over time.

Q. How do I clean a system?

Water treated with a cleaning agent is re-circulated on the high pressure side of the system for an hour or so. Then, the membrane is flushed to drain.

Small systems will have to shut down during cleaning, but in larger systems, the individual banks of membranes can be cleaned one by one.
Q. How much maintenance is involved with a system?

A properly set system, with a good pre-treatment in place, usually needs a one-hour cleaning routine once a month. Pre-filters can be checked weekly.

Q. How much does it cost to run a reverse osmosis system?

The cost is dependent on three areas: power, materials, and labor. Check your area on power and labor costs. (Labor is usually low since the system is more or less automated.) Materials are more or less the same everywhere.

Q. What about bugs (bacteria) growing in the water?

Water storage in R/O systems is optionally passed through an UV sterilization system to kill bacteria, usually during cleaning. It is good to have the tanks black or opaque to prevent algae growth.

Q. How long will my reverse osmosis membranes last?

R/O membranes usually last many years. However, they slowly start leaking ions after a time, and have to be replaced once ion levels are not acceptable. Some membranes have been reported in continued use for 20 years.

Technorati Tags: reverse osmosis

Selecting a Reverse Osmosis system for your house relies on so many factors. You can make your best choices if you have a general understanding of the basics of the process. The technical terms will fall into places as we run you through some of the most frequently-asked-questions both from clients. In a nutshell, reverse osmosis is the method where poisoned water is forced thru a semi-permeable surface via pressure to crop pure clean water at the other end. The surface strained out TDS ( total dissolved solids ) composed typically of salts, metals, micro-organisms, minerals, chemicals, and so on. ) Water quality Is the water supply potable? An R / O system should be installed only if the water supply is deemed bacteriologically safe for human consumption, is disinfected or sterilised on a constant basis. What's the daily amount of pure water required? It should produce at least gallon of drinking water per head / each day. Is the water supply adequately pre-treated? The presence of pollutants like iron, manganese, or hydrogen sulphide should be removed by pretreatment.

What's the level of TDS? Drinking water should have a TDS of below 5 hundred. Water from wells have a TDS of 1000 to 5000, seawater has a TDS of forty thousand. Is the feed water supply chlorinated or unchlorinated? If unchlorinated, selected a TFC surface to bear bacteria attack. If chlorinated, selected a CTA surface that's not chlorine-sensitive. The surfaces need to be replaced around each two years, depending on the quantity and quality of water. What about water acidity? The average pH is 6.9 to 7.5. Low pH is awfully corrosive to metals. A pH of 6.9 is 10 times more acidic than at a Ph OF 7.0. Booster pumps Is a booster pump required? A booster pump is required if the water pressure is less than fifty psi, if the TDS in your water supply is over 1000, or if the water is extremely cold. Performance factors in the final analysis, there are 4 factors that finally affect the performance of an R / O unit one ) inward bound water pressure, two ) temperature, three ) the TDS number and, four ) the standard of the filters and surfaces used.

How much water is produced is ruled by the stress on the net surface.

If the pressure is increased, production goes up. It's also contingent upon the temperature. The cooler the feed water, the lower the rate of production. The force that ties the water molecules to melted ions or solids is known as osmotic pressure. Now, the bigger the number of the total melted solids ( TDS ) in the water, the higher is the molecular force that ties them. These water molecules that are certain to the molecules of the melted solids must be separated to pass thru the pores of the surface. To break the bond, there has to be pressure applied on the water. In the R / O process, more than one filter and surface could be used.

The pre-filters are for the sediments ( sand silt, dirt and others ). Then there are the carbon filters which pick up the chlorine which destroys the osmosis surface. Eventually , the center of the reverse osmosis system : the reverse osmosis surface. The commonest is the spiral wound.

There are 2 decisions, too the CTA ( cellulose tri-acetate ) which is chlorine reasonable and the TFC / TFM ( thin film composite / thin film material ) which isn't chlorine long suffering. If the feed water isn't chlorinated, a TFC surface is used due to its bigger resistance to bacterial attack. CTA surfaces not responsive to chlorine might be used. Most systems use TFC surfaces, with a carbon filter support.

These are the details to think about in the selection of R/O system for your office or home. Remember to also debate them with your provider for more within info on a way to select a reverse osmosis system.

Technorati Tags: reverse osmosis

Comparing filtration with reverse osmosis is like comparing two brothers with almost the same features, only with different ages perhaps. This is because the principle used by both systems is the same – filtering sediments out of the water.

Let us look first into reverse osmosis.

Reverse osmosis

Because of its present capacity of filtering some of the minutest substances on earth, the process of reverse osmosis is sometimes called hyper filtration. It allows the removal of particles as small as ions from a liquid solution.

The most common use for reverse osmosis process is in purifying water. It is used to remove salts and other impurities to restore the water’s color, taste, and its other properties.

The process is also used to purify other fluids such as ethanol and glycol by removing their contaminants and purify them for better functions.

The heart of the reverse osmosis process is the semi-permeable membrane that allows the fluid being purified to pass through while blocking the contaminants.

Another vital requirement to the system is the driving force that pushes the liquid through the membrane. The most common device used is a pump. The stronger the pressure needed, the bigger the driving force should be.

Nowadays, most reverse osmosis processes now incorporates the use of crossflow, the additional process where the membranes clean themselves during the operations.
As some of the fluid passes through the membrane the rest continues downstream, sweeping the rejected species away from the membrane.

To date, reverse osmosis is capable of straining bacteria, salts, sugars, proteins, particles, dyes, and other chemical constituents.

Filtration - How does it work?

Filtration involves water flowing through a granular bed of sand (or any other suitable filtering medium) at a low speed. The action permits the filtering media to retain most solid materials while permitting water to pass through.

To ensure adequate removal of unwanted particles, the process of filtration is usually repeated. This process is generally known as slow sand filtration. It is the oldest method of filtration but still in use up to this day.

The more modern filtration systems today use carbon as the filtering medium. The carbon is compressed into solid blocks. (This is in direct contrast to the old loose granular sand filters of old.) The carbon filters in solid blocks often include other media substances, and called multimedia filters. This new type of filter works together and in both ways, chemically and physically.

Physically, it duplicates the old work of the slow sand filters: blocking the passage of unwanted materials with molecular structures larger than that of water.

Chemically, it does additional work by the process of absorption. With it, the atomic charge of the carbon and other media encourages unwanted particles to abandon their bond with the water and attach themselves to the filter. The other media included in the filter are designed for more particles to bond with it. 

Water is then directed to several stages of carbon and multimedia filters to ensure removal of more unwanted materials. The first removes the most concentrated chemicals (chlorine, etc.) and the other next stages are for the removal of smaller and more hard-to-get chemicals like pesticides.

Some notes on reverse osmosis and filtration

Carbon and multimedia filters possess the same purifying capabilities as reverse osmosis and distillation. All three – filtration, distillation, and reverse osmosis – are all able to remove dangerous chemicals.

The slow process of carbon and multimedia filters does not need expensive energy sources like distillation (heat) and reverse osmosis (force pump), thereby making it cost-effective. It wastes little water in the process, too.

Again, when comparing filtration with reverse osmosis, the issue might all boil down again to cost-effectiveness in maintenance and ownership of either of these water-purifying systems.

Technorati Tags: reverse osmosis

When it comes to home water filters the default choice for a lot of people is the reverse osmosis style water filter. This is true because they are used in most public places like grocery stores and by the larger water delivery companies. All of those big water companies and vendors can't be wrong can they? Well, maybe so.

The reverse osmosis water filtration technique is popular as the default technology to use because it's easy to pull off technically and relatively inexpensive. It's also proven to strip water of harmful contaminants. All good so far. The potential problem with the technology is that it also strips water of the trace minerals that your body wants and needs from water.

US Auctions Australian Auctions Austrian Auctions Belgian Auctions Canadian Auctions French Auctions German Auctions Hong Kong Auctions Indian Auctions Irish Auctions Italian Auctions Dutch Auctions Polish Auctions Singapore Auctions Spanish Auctions Swiss Auctions UK Auctions

Best Match Time: ending soonest Time: newly listed Price: lowest first Price: highest first Price + Shipping: lowest first Price + Shipping: highest first

REEF DRINKING RO DI REVERSE OSMOSIS WATER FILTER SYSTEM

US $158.00

18d 9h 4m

Premier Reverse Osmosis Water Filter System 5 Stage

US $119.00

27d 11h 5m

REEF HOME RODI REVERSE OSMOSIS PURE WATER FILTER SYSTEM

US $167.20

38m

AQUA REEF RO DI REVERSE OSMOSIS PUR WATER FILTER SYSTEM

US $145.50

38m

21 PCS WATER FILTER REVERSE OSMOSIS CARBON SEDIMENT DI

US $44.00

5h 55m

REVERSE OSMOSIS WATER SYSTEM ALKALINE FILTER 6STAGE

US $139.00

11h 5m

75GPD 5 Stage Reverse Osmosis RO Water Filter Luxury

US $140.99

11h 11m

5 Stage Reverse Osmosis Drinking Water Filter Purifier

US $264.95

12h 11m

View Page:   1  2  3  4

What Is Reverse Osmosis Missing?

Mineral water is not the same as tap water and won't be no matter what you do to it. We're not talking about mineral water as a geologist would define it, we're talking about regular water and the natural trace minerals it contains. They are simple things like salts and calcium and your body uses them the same as it does the nutrients found in foods. "Pure" water wouldn't contain any minerals or harmful contaminants and would be tasty and refreshing, it just wouldn't be the healthiest choice.

What's The Alternative?

There are actually a few methods to choose from when looking to turn hard water (with minerals and other solids) soft (without.) The most common is a combination method of carbon filter along with a secondary sub-particle filter or ion exchange. These filters can produce water just as inexpensively and conveniently as reverse osmosis filters while leaving the trace minerals your body uses for nutrients.

There is debate from either side of the drinking water debate as to whether the amount of minerals in carbon filtered water are enough to impact a persons diet. In reality, the minerals in any water won't replace the need for a healthy diet. In the end it's about choices. Choices you make for you and your family about the type of water you want to drink.

The key is to make informed decisions starting with as much information as possible and understanding what choices are available. No matter which type of water filtration system you end up with, it'll be cheaper, more convenient, and better for the environment than bottled water, so you're on the right track.

By K. Lewis

K. Lewis writes on health and wealth and drinks lots of pure drinking water while doing it.

Visit http://www.pro-home-water-filter.com to learn more about the process and benefits of quality water filtration systems.

Article Source: http://EzineArticles.com/?expert=K._Lewis
http://EzineArticles.com/?Is-a-Reverse-Osmosis-Home-Water-Filter-the-Best-Choice-For-Your-Family?&id=2833791

Technorati Tags: bottled water, Drinking Water, home water, mineral water, reverse osmosis, tap water, water filter

A Guide To Aid Consumers In Choosing An Effective, Cost Efficient, Drinking Water Filtration Unit.

Purchasing a water filter in today's marketplace can be confusing even for the most savvy of consumers. Hopefully this guide will assist you in making the right choice in purchasing any water filtration system.

There are over 400 companies that sell drinking water systems for the treatment of various contaminants. Water filters vary widely in quality, price, and performance. Although hundreds of companies make water filtration devices that can reduce chlorine from water, only a few companies offer drinking water treatment units that are certified to reduce a wide array of contaminants of health concern.

The 10 Year Water Filter. This is the maintenance free water filter that provides up to ten years of cleaner better tasting drinking water. The unit can filter 25 000 gallons of water the average amount consumed by a family of four in a decade without requiring you to replace cartridges. Certified by NSF International a public health and safety organization the filter uses a patented five stage filtration system to remove 97.3% of chlorine a chemical responsible for unpleasant odors and tastes in drinking water. Requiring only minutes to install the filter comes with a diverter valve that screws onto a faucet and reroutes water to the filter via a 33' hose. About the size of a bottle of hand soap the filter sets up unobtrusively on a countertop or sink ledge and provides a vigorous stream of water. To rinse dishes using the faucet simply turn the knob on the diverter cap. 9 1 4' H x 3 3 4' Diam. 3 lbs. In Stock

A few companies or their representatives claim their products produce PURE drinking water. I have yet to meet such an animal. No water filter produces PURE water, but some do reduce numerous contaminants to a high degree. Avoid any brand that makes such false claims.

Water filters are like everything else, quality costs money. Quality drinking water purification systems usually cost a few hundred dollars to purchase, but save money in the long run because they produce drinking water for a fraction of the cost as compared to cheap filters.

Cheap filters do little or nothing as far as purifying drinking water. One thing they are good for is costing the consumer a lot of money in purchasing replacement filters. A quality filter will give you years of service and save you money. As a rule of thumb - If it costs less than - Let's say $200.00 - Put it back on the shelf. Do not worry, I am going to show you how you will save more than the $200.00....

Here are a few simple steps to purchasing a quality water filter that will be highly effective, cost efficient, and last for years.

Step 1 - Type Of System

Which application would be best for you - Counter Top - Undersink - Inline - or a Convertable type that can be used as a countertop or be installed undersink?

Counter Top Systems usually install by the use of a valve and rubber hose attached to your existing sink faucet. They do take up some space on the counter. Many people find this to be inconvenient.

Undersink Water Filters install conveniently under the sink and have their own faucet which should be installed at the corner of the sink. They save counter space. Sure beats having a monster sitting on your counter or a hose hanging off your sink faucet. This is the preferred type as it is not only the most convenient but can also be hooked up to an icemaker.

Inline Filters install directly in the line to any appliance that uses water such as an icemaking machine, coffee pots, water coolers, beverage machines, etc.

Convertible - Undersink/Countertop can be used as a countertop or installed as an undersink water filter.

Step 2 - Technology

Determine what you are trying to accomplish by using a water filter. Chlorine reduction only? Bacteria?

Or, do you want to effectively reduce bacterial cysts, chlorine and a wide range of chemical and organic contaminants at the same time. This is what a quality water filter can do.

Another thing to consider is - Do you want to remove the "Healthy Minerals" from your water? Minerals are good for your teeth and bones.

There are a number of different technologies when it comes to water purification. Here are some examples -

Loose Carbon - This is a bacteria factory. Loose carbon allows oxygen to exist within the filter itself which encourages, infact, enhances the growth of bacteria. These filters are very cheap to purchase, but expensive in the long run because the filters have to be replaced frequently.

Distillation - Can be effective on bacteria, sediments, solids, and any organic or chemical contaminant that will not evaporate. There are some chemical contaminants found in water today will evaporate, MTBE is a good example.

Ultraviolet lighting is sometimes used in conjunction with a filter to kill bacteria and has been found to be effective.

Reverse Osmosis - A membrane which reduces radium, fluoride, and numberous other contaminants to a high degree, but it does have it's limitations. There are many contaminants found in water today that will pass through an RO membrane. Reverse Osmosis used in conjunction with a high quality filter can be very effective. Reverse Osmosis does remove the "Healthy Minerals".

Reverse Osmosis alone is capable of reducing a number of contaminants found in drinking water today. Arsenic, barium, radium, giardia, cryptosporidium, entamoeba, fluoride, lead, nitrates, nitrites,
selenium and a few others...

Solid Carbon Block - This type of filtration reduces the widest range of chemical contaminants to a very high degree. Some are higher quality than others. The density and high quality of the carbon determine the effectiveness. Water passes through a high quality solid carbon block as a molecule instead of a drop. This means all the water touches the carbon. Therefore all the water is subject to proper filtration. Look for a carbon block which will reduce contaminants to at least 1 micron, preferably 0.5 micron. The smaller the number the better.

Any high quality solid carbon block will reduce a wide range of contaminants. Contaminants such as lead, bacterial cysts, mercury, asbestos, mtbe, and many others.

Step 3 - Performance

Performance is the key factor. Actually the most important thing to look for in any water filter. Don't waste your money on an ineffective water purification system that simply does not work.

****Carefully read the packaging. Determine which contaminants the manufacturer states the filter will reduce. The label on the product package should state exactly which contaminants it is capable of reducing based on standards set by NSF International.

**** So how do you know if the claims made on the label are correct? If the filters is not certified by the National Sanitation Foundation, put it back on the shelf. Quality water filter manufacturers put their filters through rigorous testing by NSF and are proud to advertise their certification.

**** NSF International tests and certifies drinking water treatment devices to the standard appropriate for the technology of the product. For filtration devices, NSF International may certify the product to improve the aesthetics of the water to Standard 42, the health effect of the water to Standard 53 or both. In addition, NSF has developed an additional testing standard for Reverse Osmosis units, Standard 58.

One other thing I want to mention, be sure the packaging states NSF Certified To Standard 53 for example. If it says "tested to NSF Standards" - This does Not Mean Certified.

If you want to see the actual certification, go to the NSF website: www.nsf.org - Click the consumer block and put in the make and model of the filter. If the filter is actually NSF Certified, you will be able to view the contaminants tested for and certified to remove. This way you can compare different certified filter's performance.

Step 4 - Cost Efficiency

Quality water filters have a long filter life capacity. This is what Saves You Money. Look for a water filter that has a capacity rating of at least 6 months. Understand, this is an estimate. The actual life of the filter depends a lot upon the qualities of your water. If your water has a lot of solids the filter will clog sooner than it is rated. If your water has a high level of contaminants, it will become ineffective sooner. In most cases though, the filter life rating is conservative, meaning the filter will actually outlast the capacity rating. Always keep the filter changed at the recommended intervals, even sooner if possible.

Cheap ineffective filters actually cost more to operate. Having to frequently change the filter cost a lot of money in the long run.

I hope this article helps you in your quest for a quality water filter!

Article Source: http://www.articlesbase.com/kitchens-articles/how-to-choose-the-right-water-filter-746064.html

Author: Patti Wilson
About the Author:

Patti Wilson
Water Filtration Consultant
MultiPure Independent Distributor
St Augustine Florida

Technorati Tags: Drinking Water, Multipure, reverse osmosis, Water Filters, Water Filtration, Water Purification