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Reverse Osmosis WaterUS.com
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More About RO
"Osmosis" is a term you may remember from biology referring to the passage of a substance through a membrane from a solution of greater concentration to one of lesser concentration.
Reverse osmosis is forcing water under pressure through a membrane, which excludes substances with a molecular structure larger than the pores of the membrane. A home reverse osmosis unit operates from the source water pressure.
Reverse osmosis removes up to 99.9% of undesirable contaminants and filters particles as small as 1/1000 of a micron by forcing untreated water through a semi-permeable membrane. Pressure forces the water to flow in the reverse direction to the direction of flow in natural osmosis.
A unique feature of reverse osmosis, compared to standard water filter methods, is that RO screens out the contaminants to be flushed away, rather then attracting and holding them as filters do. The molecules of water actually pass through the membrane leaving the contaminants behind.The membrane also allows oxygen through, as well as some other elements with a very small molecular size, including some tiny molecules of colloidal and subcolloidal minerals.
The pores are small enough to screen out radioactive minerals and fluoride (which have large molecules), as well as bacteria and even some viruses. Still, a reverse osmosis unit should always include other types of media such as a sediment filter, redox media to eliminate chlorine, biologicals and metals, and carbon to catch any organic chemicals. Eliminating these contaminants first will prolong the life of the RO membrane.
Since sediment can clog a membrane, a sediment pre-filter is often included.
Chlorine can also harm membranes. With chlorinated water, reverse osmosis requires a carbon or redox pre-filter to protect the membrane's longevity.
Reverse osmosis units are susceptible to the growth of bacteria and mold within them when not in regular use. These agents can attack and ruin a membrane, resulting in contaminated water coming through.
Redox media preceding the membrane will help prevent these microbes from getting to it. Frequent use of the unit will reduce the potential for bacteria or mold to get a colony started. A low bacterial count in the source water is also important.
Most reverse osmosis membranes are of the Thin Film Composite (TFC) type. A Cellulose Acetate (CA) membrane may be used in special situations.
Prices on quality RO units run from $170 to $800, depending on style and features.
Corrected Reverse Osmosis
Reverse osmosis water actually has an increased oxygen concentration, as O2 has a small enough molecule to cross the membrane. RO water also contains small quantities of colloidal and subcolloidal minerals.
However, the reverse osmosis process removes most of the minerals from the water.
Mineral devalued water if too acidic will draw minerals from the body when consumed regularly. The pH of RO water is often too acid for the human body. If this is the case, it is recommended that a remineralizing alkalizer unit be added to correct these problems.
We believe that reverse osmosis is the best choice in home water purification. When the source water has a pH of 7 or less, "Corrected Reverse Osmosis" is the way to go. It is recommended that you test your water with pH tape or strips (litmus paper) or another method to determine if the remineralizing alkalizer is needed to correct the water.
NOTE: We have pH tape for testing the acid/alkaline status of your water, as well as your urine and saliva (approx. 15 ft. of tape + dispenser with color chart -- range 5.5 - 8.0 pH). -- $9.70 includes postage ($7 for tape refill) CLICK HERE to order. You can learn about alkalizing the body here.
WARRANTY: Our point-of-use water filtration system housings and hardware have a warranty to be free of defects in materials and manufacture, with repair or replacement for up to one year from date of purchase, and our water cartridges for up to 90 days. (See return and liability policies.)
All components of our water systems are free of BPA.
NOTE: Our RO systems utilize a Thin Film Composite (TFC) membrane (see below).
Our reverse osmosis systems have compact designs that can easily fit on the counter or beneath the kitchen sink.
Counter Top RO

NOTE: This is assembled as ordered before shipping a few days after an order is placed.
Convenient, easy to use and hook up to a standard kitchen faucet.
u
p to 50 gallons per day (76 liters) depending on source water pressurea
ll hardware includedCounter Top Reverse Osmosis Without Corrected Water
Suggested Retail: $249 plus shipping
Our Low Price: $168.70 plus $14 shipping
in the continental U.S. (48 states)
Corrected Reverse Osmosis CounterTop System with Corrected Water

Read about the
remineralizing alkalizer for correcting RO water that is too acidic.Suggested Retail: $306 plus shipping
Our Low Price: $225.70 plus $14 shipping
in the continental U.S. (48 states)
CLICK HERE to order Corrected Counter Top RO Unit with Remineralizer
This portable 3-cartridge Counter Top Reverse Osmosis System provides safe, pure high quality drinking water with capacity of up to 50 gallons per day using reverse osmosis technology. (NOTE: Production depends on source water pressure, which can vary.) A Counter Top RO is great for homes, apartments, office, recreational vehicles, motels, and laboratory use. Our Counter Top RO has 9 stages of filtration: • Stage 1: Water passes through Granular Activated Carbon (GAC) cartridge. GAC is universally recognized and widely used as an effective adsorbent for a wide variety of organic contaminants, such as chlorine (99.9%), chemicals linked to cancer (THM's, benzine) pesticides, herbicides, insecticides, volatile organic compounds (VOC's), PCB's, MTBE's and hundreds of other chemical contaminants that may be present in water, as well as eliminating bad taste and odors from your drinking water. • Stages 2 through 8: Water travels through a multi-stage cartridge with six stages consisting of a one micron sediment filter pad, Eagle Redox Alloy 6500, Eagle Redox Alloy 9500, ceramic ball resin, Granular Activated Carbon (GAC), and another 1 micron Sediment Filter Pad. This cartridge removes particulate matter, heavy metals, chemicals, and residual chorine, and destroys bacteria, algae and parasites. • Stage 9: Water passes through 50 GPD TFC Reverse Osmosis membrane, which removes lead, sodium, cyanide, ammonium, mercury, bromide, cadmium, trivalent chromium, radium and any radioactive particles, magnesium, fluoride, nitrates, nitrites, microorganisms (including bacteria, viruses, algae and parasites such as cryptosporidium and giardia), and more. • With our "corrected" counter top RO, a "Corrected Water" sealed remineralizing alkalizer is added as a final stage to remineralize, energize and slightly alkalize the water to make it ideal for biological systems. IMPORTANT NOTE: Be aware that there is a discharge of waste water with reverse osmosis, about 2 gallons for every gallon of pure water produced. (By comparison, washing dishes uses more, and an average shower uses about 20 gallons.) For the RO membrane to continue functioning well, it is necessary to have the contaminants that are screened out flushed away. The flush water is only fit as work water, such as scrubbing the floor or washing the car. This waste water should NOT BE CONSUMED or used to water plants. Most of the time, it should just run down the drain.NOTE: These RO units are assembled upon placement of the order, and tested before shipping a few days after an order is placed.Features of Counter Top Reverse Osmosis System (see description of TFC membrane below)
WARRANTY: Our point-of-use water filtration system housings and hardware have a warranty to be free of defects in materials and manufacture, with repair or replacement for up to one year from date of purchase, and our water cartridges for up to 90 days. (See return and liability policies.)
All components of our water systems are free of BPA.
NOTE: Our RO systems utilize a Thin Film Composite (TFC) membrane (see below).
NOTE: This is assembled as ordered before shipping a few days after an order is placed.
Our Under Counter RO is
supplied with a complete installation kit that includes a European lead-free long-reach designer faucet, 4 gallons steel pressurized holding tank, all interconnecting color-coded tubing, filter cartridges, RO membrane, and installation hardware for easy installation.3.2 gallons / 12 liter storage tank
long reach faucet
up to 50 gallons per day (76 liters) depending on source water pressure
all hardware included
Under Counter Reverse Osmosis Without Corrected Water
Suggested Retail: $399 plus shipping
Our Low Price: $248.97 plus $19 shipping
in the continental U.S. (48 states)
CLICK HERE to order Under Counter RO Unit
Corrected Reverse Osmosis Under Counter System with Corrected Water

Read about the
remineralizing alkalizer for correcting RO water that is too acidic.Suggested Retail: $456 plus shipping
Our Low Price: $305.97 plus $19 shipping
in the continental U.S. (48 states)
Features of Under Counter Reverse Osmosis System (see description of TFC membrane below)NOTE: These RO units are assembled upon placement of the order, and tested before shipping a few days after an order is placed.
This thorough Under Counter Reverse Osmosis System provides safe, pure high quality drinking water with capacity of up to 50 gallons per day using reverse osmosis technology. (NOTE: Production depends on source water pressure, which can vary.) An under counter RO unit is more appropriate for long term installation in a home or business that you own.• In stage 1, water travels through a 5 micron solid carbon cartridge for removing volatile organic carbon compounds (VOC's), chlorine, insecticides, pesticides, industrial solvents, and trapping particles larger than 5 micron including sediment, silt, sand and dirt. It also helps to extend the life of the system. The extrusion process allows the production of a carbon block with more carbon, but a lower pressure drop. • In stage 2, water passes through a 0.2 micron Ultrafiltration (UF) membrane. Ultrafiltration (UF) is an important purification technology used for the production of high-purity water. UF is effective for the removal of colloids, proteins, bacteria, viruses, parasites, protozoa and pyrogens (e.g., gram-negative bacterial endotoxins), other organic molecules larger than 0.2 micron, and most other water contaminants known today. • In stage 3, Water flows through pre one-micron filter pads (1 micron equals 1/25,000th of an inch), which removes suspended particles such as silt, sediment, cyst (Giardia, Cryptosporidium), sand, rust, dirt, and other undissolved matter. • In stage 4, water passes through granulated activated carbon (GAC). GAC is universally recognized and widely used as an effective adsorbent for a wide variety of organic contaminants, such as chlorine (99.9%), chemicals linked to cancer (THM's, benzine) pesticides, herbicides, insecticides, volatile organic compounds (VOC's), PCB's, MTBE's and hundreds of other chemical contaminants that may be present in water, as well as eliminating bad taste and odors from your drinking water. Carbon is extremely porous and provides a large surface area for contaminants to collect. Carbon-only filters must also use their capacity for chlorine removal, resulting in a shortened life. They also may use a bituminous coal carbon, which is good at removing chlorine, but not as effective at removing chemicals. We use a high-grade coconut shell carbon that is most effective at removing chemicals. Coconut shell carbon provides a significantly higher volume of micro-pores than either coal, wood or lignite- based carbon. As a result, it is more effective than other carbon types in removing trihalomethanes (THM's) and other chemicals from municipally supplied water. • In stage 5, Water flows through the ion exchange resin, reducing heavy metals such as lead, copper, aluminum, and water hardness. • In stages 6 and 7, Water flows through 2 beds of redox media made of a special high-purity alloy blend of two dissimilar metals - copper and zinc. It is a major advancement in water treatment technology that works by adsorption and electro-chemical spontaneous-oxidation-reduction (redox) principles to remove many undesirable contaminants from water. Chlorine is instantaneously and almost inexhaustibly oxidized. Tests on the cartridge have shown 99+% chlorine removal past 20,000 gallons of water. In comparison, carbon cartridges of comparable volumes drop below 90% effectiveness after only 4,000 gallons. Iron and hydrogen sulfide are oxidized into insoluble matter and attach to the surface of the media. Heavy metals such as lead, mercury, copper, nickel, chromium, cadmium, aluminum, and other dissolved metals are removed from the water by the natural electrochemical process. They are attracted to the surface of the media, much like a magnet. This media also inhibits bacterial growth throughout the entire unit. In fact, it has been shown to be reduced up to 90%, eliminating the need for silver, which is commonly used in carbon-only filters (silver is considered a pesticide by the EPA and, as such, must be registered with them). Is copper or zinc added to the water in any significant amount? On 2.3 ppm chlorinated water, <0.05 mg/l copper and only 0.46 mg/l zinc were measured. The EPA aesthetic levels are 1.0 mg/l for copper and 5.0 mg/l for zinc. Both zinc and copper are essential minerals for good health - the FDA recommends a daily intake of 15 mg of zinc and 2 mg of copper.•
In stage 8, Water flows through another one-micron filtration pad for further reduction of undesirable particles. The end result is a great reduction or elimination of a wide variety of contaminants. • In stage 9, Water passes through the reverse osmosis membrane, which removes and filters particles as small as 1/10,000 of a micron. Most inorganic chemicals (such as salts, metals, minerals, including lead, sodium, cyanide, ammonium, mercury, bromide, cadmium, trivalent chromium, radium and any radioactive particles, magnesium, fluoride, nitrates and nitrites), and most microorganisms (including bacteria, viruses, algae and parasites such as cryptosporidium and giardia) are removed. • In stage 10 and 12, Water flows through additional one-micron filter pads (1 micron equals 1/25,000th of an inch), which remove suspended particles such as silt, sediment, cyst (Giardia, Cryptosporidium), sand, rust, dirt, and other undissolved matter. • In stage 11, water passes through additional Granular Activated Carbon (GAC) as a final polishing process. • With our "corrected" under counter RO, a "Corrected Water" sealed remineralizing alkalizer is added as a final stage after the holding tank to remineralize, energize and slightly alkalize the water to make it ideal for biological systems. IMPORTANT NOTE: Be aware that there is a discharge of waste water with reverse osmosis, about 2 gallons for every gallon of pure water produced. (By comparison, washing dishes uses more, and an average shower uses about 20 gallons.) For the RO membrane to continue functioning well, it is necessary to have the contaminants that are screened out flushed away. There is a flush water tube to be fed into the under sink drain pipe. NOTE: We also have under counter reverse osmosis systems with Ultra Filtration after the holding tank for a final bacteria screen. Contact us for more information.
Description Of TFC Reverse Osmosis Membrane
TFC Membrane
*Nominal Rejection Characteristics of Reverse Osmosis MembranesION % Rejection ION % Rejection Calcium 95 - 98 Bromide 93 - 96 Sodium 94 - 98 Phosphate 97 - 98 Magnesium 95 - 98 Cyanide 90 - 95 Iron 97 - 98 Sulfate 97 - 98 Potassium 94 - 97 Thiosulfate 97 - 98 Manganese 97 - 98 Silicate 94 - 96 Aluminum 97 - 98 Silica 85 - 90 Copper 97 - 98 Nitrate 92 - 95 Nickel 97 - 98 Boron 60 - 70 Cadmium 95-98 Borate 40 - 70 Silver 95 - 97 Fluoride 93 - 95 Zinc 97 - 99 Polyphosphate 98 - 99 Mercury 95 - 97 Orthophosphate 98 - 99 Hardness Ca&Mg 95 - 98 Chromate 90 - 97 Radioactivity 95 - 98 Bacteria 99+ Chloride 90 - 95 Lead 96 - 98 Ammonium 85 - 95 *The above percent of rejection is for reference only and not to be construed as any guarantee since the chemistry, temperature and TDS are not constant in each water supply.
Replacement Cartridges For Reverse Osmosis Systems
NOTE: Reverse Osmosis (RO) removes more of most chemicals, bacteria, algae, etc., than filters do. However, it also removes most minerals and leaves water more acidic.
CLICK HERE for information on the natural remineralizing alkalizer cartridge that is available to correct RO water.
Counter Top RO Replacement Cartridges
Granular Activated Carbon Cartridge
CQE-RC-04038 - GAC Inline Cartridge
This GAC cartridge removes volatile organic carbon compounds (VOC's), insecticides, pesticides and industrial solvents. (See just above.)
Suggested replacement time -- 1 to 1 1/2 years
Granular Activated Carbon Cartridge -- $31.50 each (Free Shipping in U.S.)
CLICK HERE to order GAC Cartridge
For Counter Top RO System
Multi-6-Stage Plus Inline Filtration Cartridge
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CQE-RC-04040 - Multi Six Stage filtration cartridge:
1 micron Sediment Filter Pad
Eagle Redox Alloy 6500 (like "KDF 55")
Eagle Redox Alloy 9500 (like "KDF 85")
Granular Activated Carbon (GAC)
Ceramic Ball Resin
1 micron Sediment Filter Pad
Suggested replacement time -- 2 years
Multi-Stage Plus Cartridge -- $57 each (Free Shipping in U.S.)
CLICK HERE to order Multi-Stage Plus 6 Stage Cartridge
For Counter Top RO System
Reverse Osmosis Membrane
CQE-RC-04041 50 GPD TFC Membrane Cartridge
Removes lead, sodium, cyanide, ammonium, mercury, bromide, cadmium, trivalent chromium, radium, magnesium, fluoride, nitrates, nitrites and more.
Suggested replacement time -- 2 to 3 years
Reverse Osmosis Membrane -- $65.50 each (Free Shipping in U.S.)
CLICK HERE to order Reverse Osmosis Membrane
For Counter Top RO System
Unit for Reverse Osmosis System -- Counter Top or Under Counter"Corrected Water" Sealed Remineralizing Alkalizer
CQE-RC-04054 - Remineralizing Alkalizer Sealed Inline Unit
for source water of pH 7 or below
Our Price: $57 with Free Shipping in Continental U.S. (48 states)
CLICK HERE to order Corrected Water Sealed Remineralizing Alkalizer For Reverse Osmosis
NOTE: The reusable fittings that come with the original unit are not included with the replacement cartridge. For the complete alkalizer with tubing and fittings order here.
Under Counter RO Replacement Cartridges
Solid Carbon Block Cartridge
CQE-RC-04000 2.5" x 9.75" - 5-Micron Carbon Block Filter Cartridge
This solid carbon block from coconut shells simultaneously removes chlorine, bad taste and odor, and organic chemicals that contribute to taste and odor, while providing the particulate filtration and dirt-holding capacity of an efficient 5µm nominal sediment filter. The extrusion process allows the production of a carbon block with more carbon, but a lower pressure drop.
A solid carbon block filter delivers extended life, while removing sediment, chlorine, bad taste and odor, and organic contaminants from water, aqueous solutions or suspensions. Solid carbon block is also widely used in filtering organic solvents.
Suggested replacement time -- 1 to 1 1/2 years (more often with well water)
Solid Carbon Block Cartridge -- $19.50 each (Free Shipping in U.S.)
CLICK HERE to order Solid Carbon Block Cartridge
For Under Counter RO System
UltraFiltration Membrane
CQE-RC-04055 0.2 micron UltraFiltration Replacement Cartridge
9 3/4" long, diameter about 2 7/8 in.
Suggested replacement time -- 2 years (more often with well water)
UltraFiltration Replacement Cartridge - $39.50 (Free Shipping in the U.S.)
CLICK HERE to order UltraFiltration Cartridge
For Under Counter RO System
Multi-Stage Plus Filtration Cartridge

CQE-RC-04002 2 7/8" X 9 3/4" - Six Stage Filter Cartridge
1 micron Sediment Filter Pad
Eagle Redox Alloy 6500 (like "KDF 55")
Eagle Redox Alloy 9500 (like "KDF 85")
Ion Exchange Resin
Granular Activated Carbon (GAC)
1 micron Sediment Filter Pad
Suggested replacement time -- 2 years
Multi-Stage Plus Cartridge -- $57 each (Free Shipping in U.S.)
CLICK HERE to order Multi-Stage Plus 6 Stage Cartridge
For Under Counter RO System
Reverse Osmosis Membrane
CQE-RC-04041 50 GPD - TFC Membrane Cartridge
Removes lead, sodium, cyanide, ammonium, mercury, bromide, cadmium, trivalent chromium, radium, magnesium, fluoride, nitrates, nitrites and more.
Suggested replacement time -- 2 to 3 years
Reverse Osmosis Membrane -- $65.50 each (Free Shipping in U.S.)
CLICK HERE to order Reverse Osmosis Membrane
For Under Counter RO System
Granular Activated Carbon (GAC) Filter Cartridge
CQE-RC-04038 - GAC Inline Cartridge
Granular Activated Carbon (GAC) cartridge. GAC is universally recognized and widely used as an effective adsorbent for a wide variety of organic contaminants, such as chlorine (99.9%), chemicals linked to cancer (THM's, benzine) pesticides, herbicides, insecticides, volatile organic compounds (VOC's), PCB's, MTBE's and hundreds of other chemical contaminants that may be present in water that cause bad taste and odors in your drinking water.
Suggested replacement time -- 1 to 1 1/2 years
GAC Post Cartridge for RO -- $31.50 each (Free Shipping in U.S.)
CLICK HERE to order GAC Post Cartridge
For Under Counter RO System
Contact us for more information.
WATER PURIFIERS FROM WaterUS.com
"The Water You Want" ~ Pure Water Fit To Drink
One of our dual or triple Redox & Carbon plus Solid Carbon Block point-of-use units will effectively reduce or remove the following contaminants:
~algae ~bacteria ~parasites ~mold/fungus ~bad taste ~bad odor ~pesticides (eg. Endrin, Lindane, Methoxychlor, Toxaphene, etc.) ~herbicides (eg. Silvex; 2, 4-D; etc.) ~fertilizers ~nitrates ~detergents ~PCB's ~THM's ~arsenic ~aluminum ~barium ~cadmium ~chlorine ~chromium ~fluoride ~hydrogen sulfide ~iron ~lead ~mercury ~radon ~selenium ~and many more
NOTE: For those on fluoridated city water, our special units with redox + "alumina" or our reverse osmosis systems will more thoroughly eliminate fluoride. NOTE: It is recommended you have a Corrected Water cartridge with either of these systems.
All components of our water systems are free of BPA.
WARRANTY: Our point-of-use water filtration system housings and hardware have a warranty to be free of defects in materials and manufacture, with repair or replacement for up to one year from date of purchase, and our water cartridges for up to 90 days. (See return and liability policies.)
CLICK HERE to view the ISO, NSF and CE certifications for our water systems.
CLICK HERE for details on our systems for fluoridated city water.
CLICK HERE for details on our point-of-use redox & carbon water purifier systems.
CLICK HERE for information on our UltraFiltration systems.
CLICK HERE for details on our Reverse Osmosis systems.
CLICK HERE for information on the AquaWizard Faucet R. O., a unique reverse osmosis unit.
CLICK HERE for information on our "Corrected Water" remineralizing alkalizer units.
CLICK HERE for information on a whole house system that can purify all the water in your home.
CLICK HERE for information on our Pitcher Water Filter.
CLICK HERE for information on shower and bath purifiers.
CLICK HERE for information on combination water purifier, cooler, and heater units.
CLICK HERE to view pictures of our purifiers.
We also offer Ultra Violet units for water with bacteriological problems. Contact us for more information.
WaterUS.com Corrected Water Systems
"The Water You Want" ~ Pure Water Fit To Drink
NOTE: You can purchase the products presented at any of our websites with confidence of their quality and of the integrity of the companies that provide them.
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since 1975
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