Reverse Osmosis water filtration process is simple and straightforward. It is accomplished by water pressure pushing tap water through a semi-permeable membrane to remove contaminants from water. This is a process in which dissolved inorganic solids are removed from a solution. This process differs from standard filtration where impurities are collected within the filter media. The reverse osmosis process pushes water through a series of filters and ultimately the clean water goes to the holding tank, and the contaminants are flushed down the drain.

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3. Give us a call: In case the above steps haven't helped you determine the necessary filters, don't hesitate to contact our customer support. We're here to assist you from Monday to Friday, 9 am to 5 pm Central Time at 877-377-9876.

General performance data is available below for under-counter RO systems. Manufacturers often provide specific information on their system to help consumers understand the capabilities and effectiveness of their reverse osmosis system.

We highly recommend that you purchase top-quality replacement filters that are designed for optimal performance and reliability. To help our customers, we send reminder emails so thye'll know exactly when it's time to change out the filters or membrane.

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Before purchasing a UV water disinfection system, we suggest considering the following recommendations to get the best results.Read More>

An under sink RO drinking water filtration system uses the same technology that major water bottling plants use to filter water.

Post filter(s): After the water leaves the RO storage tank, but before going to the RO faucet, the treated water goes through a final “post filter”. The post filter is usually a carbon filter. Any remaining tastes or odors are removed from the product water by post filtration “polishing” filter.

CARBON FILTERThe carbon filter is designed to remove chlorine and other contaminants that affect the performance and life of the RO membrane as well as improve the taste and odor of your water. *In a 5-stage RO system, phase 2 and 3 are both carbon filters.

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Reverse Osmosis system

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Generally, residential "Point Of Use" (POU) RO systems are installed and stored under the kitchen sink and filtered water dispenses from an RO faucet.

Community/Private: Non­-ChlorinatedSystem Pressure: 30 – 100 PSITemperature: 40° – 100° F (4° – 38° C)pH Range: 3.0 – 11.0Maximum Supply TDS (total dissolved solids) Level: 2000 mg/LTurbidity: < 1.0 Net Turbidity (NTU)Hardness (CaCO3: < 350 mg/L (< 01 mg/LIron (Fe): < 0.05 mg/LManganese (Mn): 0.00 mg/LHydrogen Sulfide (H2S): 0.00 mg/LChlorine (Cl2): N/A

CTA - cellulose tri-acetate - membrane is chlorine tolerantTFC - thin film composite - not chlorine tolerant but has a higher production capacitypsi - pounds per square inchTDS - total dissolved solidsmg/L - milligrams per litergpg - grains per gallonNTU - nephelometric turbidity units

Considering which replacement filters and membranes you need for your reverse osmosis filtration setup? Here are three steps to guide you in identifying your current RO system, ensuring you select the appropriate replacements.

As you compare Reverse Osmosis Water filter systems to find the product that is right for you, be sure to ask yourself these 5 questions:

The various parts on a reverse osmosis system (such as the storage tank or faucet) will wear out with time. We provide an RO troubleshooting guide to help you diagnose the issue and determine which part needs to be replaced. Also, RO part replacement recommendations may be listed in your RO system's owner's manual.

SEDIMENT FILTERThis pre-filter stage is designed to strain out sediment, silt, and dirt and is especially important as the sediment filter protects dirt from getting to the delicate RO membranes that can be damaged by sediment. Learn more about sediment filter.

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Reverse Osmosis Membrane: The Reverse Osmosis Membrane is the heart of the system. The semipermeable RO membrane is designed to remove a wide variety of both aesthetic and health-related contaminants. After passing through the membrane, the water goes into a pressurized storage tank where treated water is stored.

Tap water varies with each city and water source. Some tap water is heavy in mineral content which can affect the taste and smell of water. Filtering water with a reverse osmosis system will remove most minerals in water and greatly improve the aesthetics of drinking water.

Faucet: The RO unit comes with a faucet, which is installed at the kitchen sink. Some areas have plumbing regulations requiring an air gap faucet, but non-air gap models are more common. Designer faucets are also available to complement your kitchen decor.

Non-air gap faucets tend to be quieter than air-gap faucets. Non-air gap faucets make no gurgling sound since the drain line from the RO membrane flows directly into the sink drain line. Learn more about the difference between “Air Gap” and “Non-Air Gap” faucets.

A whole-house Reverse Osmosis system (also called a POE “point of entry” system) allows RO filtered water at all sinks, showers and appliances throughout the house. A POE system ties into the main water line coming into your home and is generally installed in the garage.

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Reverse Osmosis (RO) is a water treatment process that removes contaminants from water by using pressure to force water molecules through a semipermeable membrane. During this process, the contaminants are filtered out and flushed away, leaving clean, delicious drinking water. Reverse osmosis is capable of removing up to 99 percent of 65 different contaminants, including lead, fluoride, PFOS, pesticides, chlorine, dissolved salts, and more.

Some name brand Reverse Osmosis systems such as Culligan and Rainsoft require expensive proprietary filter replacements. An RO "retrofit" kit allows you to keep your existing RO tank and faucet, but install a new manifold so that going forward, you can have delicious, clean filtered drinking water, without the excessive cost of name-brand filters. Our high-quality compatible filters are guaranteed to meet the performance of proprietary filter.

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Automatic Shut Off Valve (SOV): To conserve water, the RO system has an automatic shut off valve. When the storage tank is full, the automatic shut off valve closes to stop any more water from entering the membrane and blocks flowing to the drain. Once water is drawn from the RO faucet, the pressure in the tank drops; the shut off valve then opens to send the drinking water through the membrane while the contaminated wastewater is diverted down the drain.

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For more information about whole-house reverse osmosis and what whole house water filters we recommend, please read this article.

We’ve been in the water filtration business since 2003 and have found Reverse Osmosis filtration to consistently be one of the best ways to remove contaminants from tap water.

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The guidelines outlined below are very general. Specific information about how often your membrane or filter should be replaced can be found in the products’ “Specs” or your product owner’s manual. If you’ve purchased a system or filter from us here at ESP Water Products, we will send reminder emails when it comes time to change your filter. As a general rule, here are three things you can do to maintain (and increase the lifespan) of your reverse osmosis system:

Reverse Osmosis water filters are the perfect solution if you’re looking to improve the taste, odor and appearance of your water. Here are some of the most common applications for RO technology:

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1. Whole-house reverse osmosis water filters can be expensive2. Whole-house RO water filter systems require a lot of maintenance.3. Whole-house reverse osmosis consumes a lot of water4. Whole-house RO flushes a lot of filtered water down the drain.5. Additional pre-treatment and post treatment will probably be needed.6. A lot of storage space is required for the large whole-house RO system.

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This guideline is very general. Specific information about how often your RO membrane and filters should be replaced can be found in the product owner's manual for each system. If you’ve purchased your RO drinking water system or replacement filters from us here at ESP Water Products, we will send reminder emails when it comes time to change your filter.

Reverse osmosis

Removes ImpuritiesReverse osmosis water systems can reduce or remove common pollutants from water including nitrates, lead, pesticides, PFOS, sulfates, fluoride, bacteria, pharmaceuticals, Arsenic V, and much more. A Reverse Osmosis systems’ carbon filter will also remove chlorine and chloramines.

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The water professional will most likely run a quarter-inch tube from the under-sink RO unit to your fridge. Water pressure is a consideration with some refrigerators, so be sure to refer to your RO system’s owner’s manual as the pressure from the reverse osmosis unit is about two-thirds of the incoming line pressure.

Pre-Filter(s): Water from the cold-water supply line enters the Reverse Osmosis Pre Filter first. There may be more than one pre-filter used in a Reverse Osmosis system, the most common being sediment and carbon filters. These pre-filters are used to protect the RO membranes by removing sand silt, dirt, and other sediment that could clog the system. Additionally, carbon filters may be used to remove chlorine, which can damage the RO membranes.

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Installed at the kitchen sink: A small RO filtration system can be installed at the kitchen tap to provide top-quality drinking water. This is called a “point of use” (POU) water filtration system and can also connect to your fridge and ice machine. Water pressure is a consideration with some refrigerators, so be sure to refer to your RO system’s owner’s manual as the pressure from the Reverse Osmosis unit is about two-thirds of the incoming line pressure. Related content: How to Install a Reverse Osmosis System

POLISHING FILTERIn a four-stage RO System, a final post filter (carbon filter) will “polish” off the water to remove any remaining taste and odor in the water. Ensuring you’ll have outstanding drinking water.

Reverse Osmosis incorporates carbon filtration which removes chlorine, chloramines, forever chemicals like PFOS, Arsenic V, pesticides, herbicides and more. The removal of these contaminants not only makes for safer drinking water, but also greatly improves the taste.

Reverse Osmosis (RO) water filtration is a process that removes impurities by forcing water through a semi-permeable membrane. This method is highly effective in filtering out dissolved salts and minerals such as sulfate, Magnesium, heavy metals such as lead, arsenic V, fluoride, and dozens of other impurities.

At ESP Water Products, we’ve been selling water filtration equipment for 18+ years. This longevity in the industry has made us very selective in what we sell and endorse. We carry only Reverse Osmosis systems that have won our confidence--those that are manufactured with the highest-quality components, offer outstanding warranties, and have the highest ratings for customer satisfaction.

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Check Valve: A check valve is in the outlet end of the RO membrane housing. The check valve prevents the backward flow of treated water from the RO storage tank. A backward flow could rupture the RO membrane.

The RO process leaves trace amounts of minerals and salts which makes for an overall better taste rather than the “flat” taste of distilled or bottled water. Best of all, RO-filtered water saves you the expense of bottled water and is better for the environment since you’re not adding water bottles to local landfill. This eco-friendly solution means you can have healthy, naturally-fresh drinking water available right at your kitchen tap.

A reverse osmosis water filter system effectively removes dozens of contaminants, for improved taste and odor-free drinking water.

Absolutely. Looking at cost alone, RO systems generally cost less than 30-cents per day to own and operate for a family of four. From a cost-savings perspective, since most Americans spend $100/year on bottled water translating to $400/year for the household, an RO system would save nearly $300/year as it operates for roughly $100/year. And the number crunching doesn’t reveal anything about the health benefits of RO.

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RO systems can remove harmful contaminants such as pesticides, PFAS, herbicides, chlorine, chloramine, and Arsenic V, certainly making an RO system “worth it.”

The typical under-counter reverse osmosis tank is 12 inches in diameter and 15 inches tall. The reverse osmosis system will operate under water pressure ranging from 40-100 PSI and generate 10-75 gallons (that is 45-340 Liters) per day.

Improves TasteRO filtration improves taste, odor and appearance of water by removing contaminants that cause taste and odor problems.

Under-the-counter reverse osmosis systems are plumbed to the incoming coldwater line, drain, and an independent faucet. But it is possible for a water treatment professional to plumb an RO unit to your fridge and/or ice machine, as well.

Most RO systems look similar and have the same basic components.Although most RO systems look and work basically the same way --they differ in the QUALITY of their components.

Arsenic V: 92-96%Barium: 95-98%Cadmium: 95-98%Calcium: 94-98%Chloride: 85-92%Cyanide: 84-92%Fluoride: 85-92%Iron: 94-98%Lead: 95-98%Manganese: 94-98%Magnesium: 94-98%Mercury: 95-98%Nickel: 96-98%Nitrate: 60-75%Phosphate: 96-98%Potassium: 85-95%Selenium: 94-96%Sodium: 85-94%Sulfate: 96-98%Zinc: 96-98%

A common reverse osmosis (RO) under-sink drinking water system is highly effective at removing or reducing a wide range of contaminants from water.

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In theory, whole house reverse osmosis systems sound like a good idea. But here are the reasons we don't typically recommend whole house RO water filters:

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Saves MoneyWith an RO system, you can cancel your water delivery service and stop purchasing cases of bottled water. Reverse Osmosis filtration provides “better-than-bottled water” quality water for just pennies per gallon.

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Cold Water Line Valve: Valve that fits onto the cold-water supply line. The valve has a tube that attaches to the inlet side of the RO pre filter. This is the water source for the RO system.

Since 2003, we’ve found that the quality of components is truly the key differentiation between reverse osmosis systems. This is because RO units manufactured using excellent craftsmanship, as well as superior parts and components are what ultimately produce the best intended results--top-quality water for the home and business.

Storage Tank: The standard RO storage tank holds from 2 - 4 gallons of water. A bladder inside the tank keeps water pressurized in the tank when it is full. The typical under counter Reverse Osmosis tank is 12 inches in diameter and 15 inches tall.

Flow Restrictor: Water flowing through the RO membrane is regulated by a flow restrictor. There are many different styles of flow controls, but their common purpose is to maintain the flow rate required to obtain the highest quality drinking water (based on the gallon capacity of the membrane). The flow restrictor also helps maintain pressure on the inlet side of the membrane. Without the additional pressure from the flow control, very little drinking water would be produced because all the incoming water would take the path of least resistance and simply flow down the drain line. The flow control is most often located in the RO drain line tubing.

A reverse osmosis drinking water system should be cleaned, sanitized and recharged annually. To simplify things we recommend sanitizing your system when you change out your filters. Read detailed instructions on how to sanitize an RO system. You can hire a local water treatment professional to clean and sanitize your system or you can perform the annual sanitation and filter change yourself. Learn more about how to replace your RO water filters.

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Because minerals in water are in an inorganic state that our bodies cannot digest, removing the minerals does not make RO-filtered water unhealthy. Keep in mind that while minerals are essential for proper health, food is the primary source of the minerals our bodies need to be healthy--and in a form our bodies can digest.

Generally, reverse osmosis systems are very quiet-- though you may hear a “gurgling” sound as the “concentrate” or waste water flows from the membrane to the drain. Reverse osmosis is designed so that “crossflow” water flushes the contaminated concentrate away from the system. This flushing keeps the unit from fouling.

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More details on reverse osmosis abaility to remove contaminants from water is available here. That is where Reverse Osmosis comes in. With an RO water filtration system, you can filter out impurities and produce outstanding drinking water for your home or business.

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REVERSE OSMOSIS MEMBRANEThe semi-permeable RO membrane in your RO system is designed to allow water through but filter out almost all additional contaminants.

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Commercial Application: Reverse Osmosis water filtration is a perfect fit for many businesses, as certain commercial applications require reverse osmosis filtration to remove a specific contaminant from water. Reverse osmosis commercial water treatment may require prefiltration, a demand pump, a large holding tank, and more. But RO filtration might still be the right solution when a high level of a specific contaminant is most economically removed by the RO process. At ESPWaterProducts.com, we carry a wide variety of large RO systems designed for many different commercial applications. If you're interested in commercial reverse osmosis, please give us a call to talk through specifics: 877-377-9876.

RO membranes and filters will become clogged and foul with time. When this happens, the RO system will begin to produce less and less drinking water. How often you should change the filters will vary based on water usage and local water conditions.

Drain line: This line runs from the outlet end of the Reverse Osmosis membrane housing to the drain. The drain line tubing is used to dispose of the wastewater containing the impurities and contaminants that have been filtered out by the reverse osmosis membrane.

If you hear other sounds, such as a “hissing” noise, immediately call your local water treatment professional as there may be a problem with water pressure, the air gap or a leak.

Community/Private: ChlorinatedSystem Pressure: 30 – 100 PSITemperature: 40° – 90° F (4°– 32° C)pH Range: 4.0 – 8.0Maximum Supply TDS Level: 1500 mg/LTurbidity: < 1.0 Net Turbidity (NTU)Hardness (CaCO3: < 350 mg/L (< 0.1 mg/L)Iron (Fe): < 0.05 mg/LManganese (Mn): 0.00 mg/LHydrogen Sulfide (H2S): 0.1 – 10.0 mg/LChlorine (Cl2): N/A

If you're searching for a water filtration system that will give you outstanding water. Here are a few reasons to consider RO: