Comparing Carbon Block, Reverse Osmosis, and Other Common Water Filtration Methods


Article by: Douglas Frans

The general public is justifiably confused about differences among water , Case Goods filtration approaches and their relative efficacy. When one begins shopping for a water , Add Great Patio Furniture filtration device, he is immediately presented with a rather bewildering set of choices and the daunting task of choosing from among reverse osmosis, KDF, carbon , How the New Central Air Conditioning Units Save Energy block and even distillation - to name the most common. In the following article, we have endeavored to describe each of these approaches in limited detail and then compare and contrast these various types of filtration technologies to assist you in making an informed decision when it comes time to purchase a water , Construction - Choosing The Right Architect filter system. The main filtration approaches/filters are listed below:

Carbon Block Technology

With carbon , Energy Conservation - Simple Tips that Will Reduce Your Energy Bill block filters, water , Algae Resistant Roof Shingles is forced through the pores of the densely compacted carbon , Is Laminate Flooring Your Choice? block, where a combination of mechanical filtration, electrokinetic adsorption, and physical/ chemical adsorption take place , House Painting Book to reduce a wide range of contaminants. Solid Carbon , Home Security Tips For Those On A Budget Block technology can reduce chlorine, taste and odor problems, particulate matter, and a wide range of contaminants of health concern -- cysts (cryptosporidium and giardia), VOCs (pesticides, herbicides, and chemicals), certain endocrine disrupters, Trihalomethanes (cancer-causing disinfection by-products), heavy metals , Energy Conservation - Simple Tips that Will Reduce Your Energy Bill (lead, mercury), turbidity (clarity), MTBE, Chloramines and asbestos. , Addition To Coolness Solid carbon , Wow! Outdoor Tile Murals ~ Any Image, Any Size block filters do not remove healthful, naturally-occurring minerals, require no electricity, , How About a Jungle Mural to Put Some Swing Into Your Child’s Room? and do not add salt or silver to the water. , Garage flooring, floor coverings, floor material, epoxy, concrete floor paint, & floor coatings a

Reverse Osmosis

Reverse osmosis (RO) has been known for more than a century, but it did not become a commercial process until the early sixties when a special membrane was developed (1,2,3,4). Because RO operates at a comparatively low temperature , Kicking Up Storage For The Home And Office Into Overdrive and is relatively energy , What is the best mattress on the market? Tips while buying a mattress. efficient, it is employed in various applications, e.g., desalination, treatment of waste water, , Advantages Of Vinyl Porch Railings reclamation of minerals, concentration of whey and other food , Baths Take on a New Seasoned Look from Modern to Traditional products, and purification of water. , Solar For Your House: Learn The Lizard Lesson While RO will remove certain contaminants and additives that carbon , The Versatile Reciprocating Saw: The Power Tool of Your Dreams block filters will not (i.e fluoride and nitrates for example), it has a number of downsides as well. These include: RO has no independent ability to reduce most Volatile Organic , 10 Things You Must Know When Building or Renovating Chemicals (VOC's); it has very low output - takes up to 24 hours to process 5 gallons of water; you must have a holding tank to store the processed water; considerable water , With A Stylish Bathroom Vanity You Can Take Pride In Your Bathroom's Appearance! is wasted - for every gallon processed, 3 to 9 gallons are wasted and it removes minerals and trace elements essential to good health.

In the RO process, feed water , Is Laminate Flooring Your Choice? is passed through a prefilter after pH adjustment, and is pumped to the membrane modules at the designed pressure. The product water , Addition To Coolness is then pumped to a storage tank and the concentrate is drained (6). Most RO units with a cellulose acetate membrane are designed to operate between 55 F - 86 F. (13 C - 30 C). In practice, the feed water , How About a Jungle Mural to Put Some Swing Into Your Child’s Room? may go through any one or a combination of several of the following pretreatments: sand , Construction - Choosing The Right Architect bed, chlorinator and retention tank, anthracite filter, activated charcoal filter, degasifier, microfilter, neutralizer, and deionizer, depending on the condition of the feed water , Pergo Floors - Pick Model Right for You and the desired quality of the product water. , Energy Conservation - Simple Tips that Will Reduce Your Energy Bill Since water , Algae Resistant Roof Shingles conditions may vary from time to time, adequate pretreatment must be provided so that the dissolved solids and the bacterial level of the feed water, , Repairing Pinhole Leaks in Copper Pipes after prefiltration, can be controlled within the designed limits. In othere words, to get adequate treatment and a resulting safe water , Construction - Choosing The Right Architect product, RO must be combined with othere technologies such as carbon , Creating a Custom Kitchen Island When Remodeling the Kitchen block and/or granulated activated carbon. , The Wonders of Walk-In Bathtubs

Charcoal Filters or Granulated Activated Carbon , Addition To Coolness (GAC)

These come in powdered or granulated form which allows water , Repairing Pinhole Leaks in Copper Pipes to flow around rather than through the carbon. , How the New Central Air Conditioning Units Save Energy They are sometimes referred to as taste and odor filters because of the limited contact time the water , DIY Methods to Save on Utilities has with the carbon. , How the New Central Air Conditioning Units Save Energy In some cases, they can promote the growth of bacteria.


In the KDF application, water , Air Purifier - Help Or Hype passes through a bed , How the New Central Air Conditioning Units Save Energy of a media made of a special high-purity alloy blend of two dissimilar metals , Solar For Your House: Learn The Lizard Lesson - copper , House Painting Book and zinc KDF-55D. This media, patented in 1987 by KDF Fluid Treatment, Inc., is a major advancement in water , Quartz Countertops As An Alternative To Granite or Laminate treatment technology that works on the electro-chemical and spontaneous-oxidation-reduction (redox) principles. Chlorine is instantaneously and almost inexhaustibly oxidized.

Silver-Charcoal Filters

Same as Charcoal Filters above; however, uses silver to inhibit the growth of bacteria while water , All Ceramic Floor Tile Is Not Created Equal sits in filter. Silver ingested in certain doses can be poisonous to the human body; therefore, it must be registered with the EPA as containing a poisonous substance.

Limited Media Filters

As the demand for quality drinking water , Garage Floors - Let's Look at Your Options continues to grow, , Wow! Outdoor Tile Murals ~ Any Image, Any Size new types of media will be test-marketed, from metal , Can Pest Control Stop The Pests From Making Your Home Into A Winter Resort? shavings to coconut shells. Some materials can be quite "Âťexceptional"Âť in reducing a particular contaminant in the water, , The Versatile Reciprocating Saw: The Power Tool of Your Dreams but there is a wide range of contaminants that should be addressed - not just one or two.

______________________Filtration Type_______________

.................Reverse....Carbon....KDF....Carbon ..................Osmosis.....Block................(GAC)

Contaminants Reduced






...Microbes &.......No...........Yes........No.......Some



Other Features



....Water.....High Waste....None........None......None ....Waste


..Maintenance ....Costs..........High...........Low........Low.....Variable
Douglas Frans - EzineArticles Expert Author
Douglas Frans, Ph.D. Has been a mental health practitioner, educator, lecturer and researcher over a 30 year professional career. His primary clinical work has focused on personal empowerment and compulsive disorders including: addiction and eating disorders. He has worked in private practice settings and also directed mental health, addiction and eating disorder recovery programs. He has practiced primarily from a competency-based perspective. Dr. Frans consults and writes about water , DIY Methods to Save on Utilities quality issues and water , Foundation Repair filters as well.

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