A point-of-use reverse osmosis (RO) system is a water filtration device that is connected to a single fixture (e.g., under the kitchen sink) and uses the process of RO to remove contaminants from the water supplied to that fixture. RO is the process by which pressure forces water through a semi-permeable membrane, creating a stream of treated water, called “permeate,” and a stream of reject water called “concentrate” or “brine.” These systems can potentially remove water contaminants such as lead, volatile organic compounds (VOCs), PFAS, arsenic, bacteria, and viruses. Point-of-use RO systems are typically installed in residential settings but can also be found in commercial office spaces or kitchens.
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Treat With Efficiency
While RO systems can improve water quality, these systems can also generate a significant amount of water waste to operate. For example, a typical point-of-use RO system will generate five gallons or more of reject water for every gallon of treated water produced. Some inefficient units will generate up to 10 gallons of reject water for every gallon of treated water produced. In contrast, point-of-use RO systems that earn the WaterSense label must demonstrate that they send just 2.3 gallons of water or less down the drain for every gallon of treated water they produce.
All products bearing the WaterSense label are independently certified to ensure they meet EPA criteria for efficiency and performance. The WaterSense specification for point-of-use RO systems ensures that labeled RO systems are just as effective at providing the high-quality treated water consumers expect from these products. For more information on RO systems, including how they work and how to select an RO system that is right for you, view this WaterSense report, Treating Water With Less Waste (pdf) .
While the water provided by public water suppliers in the United States is some of the safest in the world, there are times when consumers may want to employ additional treatment technology to ensure safety of well water or publicly-supplied water. Due to the water-intensive nature of RO, WaterSense does not intend to promote the installation of RO systems for all applications or encourage their use over other water treatment technologies that do not waste as much water (e.g., filtration systems). In some cases, other treatment methods that use little or no water, such as filtration, are sufficient to meet consumer treatment needs. For more information, read the WaterSense Guide to Selecting Water Treatment Systems (pdf).
WaterSense Savings
For consumers who are planning to replace their reverse osmosis system at the point of water use, selecting a WaterSense labeled model will reduce water use on average by more than 3,100 gallons of water per year compared to the water usage of a typical point-of-use RO system. This translates to a savings of 47,000 gallons over the lifetime of the system.
If all point-of-use RO systems sold in the United States were WaterSense labeled, we could save more than 3.1 billion gallons of water across the country annually, which is equivalent to the annual household water needs of nearly 41,000 American homes.
Read the Point-of-Use Reverse Osmosis Systems fact sheet (pdf) for more information.
Performance
As part of the WaterSense specification development process, EPA examined key performance metrics to ensure consumer satisfaction. EPA also considered the impact of reducing water waste on RO system performance.
All WaterSense labeled point-of-use RO systems are independently certified to meet performance criteria to ensure user satisfaction and health and safety. Performance criteria address the following areas:
See the Performance Overview for more information on how WaterSense assessed performance when developing the specification.
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Specification
In November , EPA released the WaterSense Specification for Point-of-Use Reverse Osmosis Systems.
EPA hosted a meeting for manufacturers to discuss the final specification and process for earning the WaterSense label for RO systems on December 17, . The presentation and recording are available below.
For more information about the specification development process for point-of-use RO systems, including the draft specification, public response to the draft specification, and EPA’s response to public comments, please visit the Specification for Point-of-Use Reverse Osmosis Systems Background Materials Page.
Many distributors of five-gallon jug water dispensers boast that their water is of high quality. However, that’s not always true. Many major brands use micro-filtration and ultraviolet light to remove contaminants. Although this approach adequately removes microorganisms from water, the filtration used by many systems does not capture particles smaller than 0.2 microns. Some units do utilize reverse osmosis, but the dispensers have to be cleaned manually. That can reintroduce microorganisms into the water, ultimately counteracting the filtration process.
Water fountains also do very little to purify drinking water. Although the source water may be filtered, typically little filtration occurs between the source and fountain. That opens the door for contaminants and bacteria to enter the water, creating the potential for illness and a less-than-desirable taste.
At Pure Water Technology, we are committed to providing the cleanest water possible so businesses can create and maintain a more healthful, productive work environment. That is why our systems are designed with an unmatched filtration process that incudes reverse osmosis.
To better understand reverse osmosis, we must first understand osmosis. In osmosis, water of a higher concentration passes through a semipermeable membrane into less-concentrated water until the concentration levels are equal. In other words, clean water flows through a membrane into contaminated water to achieve water that is a balance between the two water supplies.
While water that has undergone osmosis contains contaminants, reverse osmosis uses counter pressure to force water through a semipermeable membrane at a high pressure to remove unwanted elements and compounds, such as chlorine, salt, and dirt. The reverse osmosis filtering process also removes microorganisms such as bacteria and viruses, resulting in pure water.
What Are the Benefits of Pure Water Technology Reverse Osmosis Systems?
Unlike other water filtration methods, our reverse osmosis filtration removes up to 99.9 percent of contaminants and particles larger than 0. microns. Also, an activated oxygen injection in our high-grade stainless-steel tanks provides additional purification by preventing bacteria, viruses, and parasites.
All our systems are manufactured with state-of-the-art quality control. Let us introduce the PW90 and the PW90 Mini Countertop, which are our flagship water filtration units.
Both provide unmatched purification through use of reverse osmosis filtration and ATS-Auto Tank Sanitization.
If you want to learn more, please visit our website commercial reverse osmosis systems.