Best Reverse Osmosis System – Guide & Reviews
A comprehensive list of best reverse osmosis with great deals!
You may not be happy with the filter jug for various reasons such as bad odor, risks of residual chemicals, and unpleasant taste. Bottled water may combat all these issues, but is not a solution for daily water requirements. Isn’t it a good idea to employ the same technology that bottled water filtration uses to get a regular supply of healthy, tasty, and pure drinking water?
Reverse Osmosis (RO) is one such leading water filtration technologies that have emerged to be successful. The RO systems are based on reversing the natural direction of water flow. It makes the water flow from a concentrated to a dilute solution through a specialized filtering membrane. The systems have several stages of pre and post filters that purify the water.
The RO system is preferred because it filters the harmful chemicals like chlorine, total dissolved solids (TDS), organic pollutants and most of the other contaminants that are easily removed by the regular filters such as dirt, silt, dust, and other sediments.
How to Choose Reverse Osmosis System
How to choose an RO system that best suits your needs depends on multiple factors. Here are some of them that can help you to pick a good RO system.
Type of Water
The first consideration to select an RO system is the type of water that you wish to filter. Different RO systems efficiently filter tap water, water from well, be it hard or soft water.The resulting water need not be always assumed to be used for drinking or cooking. It may be for your aquarium or some laboratory use.
The type of contaminants that are present in the water differs from one place to another. The contaminants can include chlorine added by the water authorities before it is supplied, bacteria that may grow in still water, lead and rust from corroded pipes, dissolved solids, and sediments that can be added in any of these stages.
There are different stages in any RO system that purifies each of these types of contaminants. Carbon blocks are incorporated to filter out the sediments and other particulate matter. There are specific stages designed to remove the TDS and other minerals.
You can use some of the best tools to determine what types of contaminants are present in the water at your place. You can choose the RO system that can remove the specific contaminants. You may also seek help from your local authorities to find out the quality of water that reaches out to you.
Often the fourth stage is the actual reverse osmosis stage that has a sheet of the filter with fine perforations with pore dimensions as low as 0.0001 microns. It squeezes the solute contaminants and allows only the solvent water to pass through it. The semi-permeable membrane is known to be the heart of the RO system.
The first task of the owner after buying the RO system is installation. The size of the RO systems varies from one model to another. There are light-weight, easy-to-fit models as well as strong and heavy-duty models. Again it depends on your requirements to choose one of them.
Some RO systems have simple architecture and can be installed easily with the help of the detailed manual. Some brands have YouTube videos to help customers. There are others which may need professional help to install and start using the RO system.
Some RO systems carry six stages while others have four. Although it is not mandatory to have bigger size as the filter stages increase, it can be considered as one of the indications. Some systems are known as countertop while others are under the sink. If the RO systems are designed to be compact, it can virtually fit any place.
Although many RO systems may advertise themselves to be maintenance-free, that may not be totally true. Like all other equipment, RO systems also need maintenance. The filters need to be changed regularly. The membrane should be replaced. These are the common maintenance that may be required. But there are more to add to the list as the RO system ages.
The life of the filters and membrane should be longer. Some systems provide six to twelve months life. The automatic shut-off, storage tank, faucet, and other connectors should be made of good quality material so that they last long. It should not require calling up technicians to fix issues such as leakage or clogs.
The ease of changing the filters is also a notable feature that may be considered while deciding on which RO system to buy. Some RO systems have easy push button facility while others may need plumbers to replace all the filter cartridges.
The main features that you look for in an RO system will often reflect the effectiveness of the water filtration process and the ease of handling the system. There is no point in having a designer faucet if it does not provide water with a good flow rate.
The RO systems come in different color and designs. Looks may not be the priority but can be one of the attractive features. Nobody would want to have something that looks shabby in their kitchen cabinet or something that can ruin the reputation in front of clients.
Some of the minerals that may be required to be present in the water to make it healthy may get sometimes removed during reverse osmosis process.Re-mineralization is one of the advanced features where the purified water is added with essential minerals such as magnesium and calcium.
Automatic shut off, indicators that suggest when to change the filters, or any leakage in the system are some of the desirable features. Color coding of the filter cartridges helps easy replacement. Tool kit included in the set is also one of the useful additions to the RO system package.
UV layer may be required to protect from microbes in the water. But if you are supplied with chlorinated tap water, it may not be an absolute necessity.
The RO system provides water that is often used for drinking or cooking. It will be an icing on the cake if it has easy options to connect to refrigerator or ice maker.
A survey says a normal person needs half a gallon of water per day. There are capacities such as 50 GPD, 75 GPD, 90 GPD, and so on. Depending on your needs, you can choose the capacity of the RO system.
The capacity of removing TDS by RO systems are up to 99%.Measuring the purity of the resulting water may be difficult. Nevertheless, there are claims of producing 99.9% pure water by some of the RO systems based on the various contaminants it can remove and the conditions of the input water.
A specific range of pressure and temperature of the incoming water would be favorable for the RO system to work efficiently. If your water supply does not meet these requirements, you may have to use additional equipment such as boosters and pumps that can enhance the pressure and control the temperature.
The pH level of the water is said to be disturbed after reverse osmosis. Many RO systems re-mineralize and bring back the pH level to acceptable levels between 6.9 and 7.5.
The purified water flow rate is another important performance characteristic. The time taken to turning on the faucet and the purified water coming out of it should be as less as possible. There may be other defects such as clogs in the filters that may affect the flow rate.
The biggest constraint in choosing an RO system will be your budget. Even if you have a fairly high budget dedicated for an RO system, you will not prefer one which is not worth the money.
Apart from just the price of the RO system, you need to think about the installation costs, maintenance costs, and the cost involved in buying any accessories required for it. A good research for an hour can tell many tales about different RO systems in the market.
Some RO systems may require professional plumbers for installation and sometimes the company offer to send technicians to your doorsteps to install the RO system for free. Regular service may also be free for a certain period.
You need to include the cost of the filter cartridges that would fit the RO system. Some RO systems come with an additional set of filter cartridges. Also, check the cost of other parts like membrane or storage tank that may require being changed after specified period.
It would also be wise to check both online and in-shop costs of the RO systems. Although online costs are often cheaper, do not forget to add delivery charges and any other service tax when you buy online.
On a positive note, you get a decent RO system in the mid-range budget. There are RO systems that have been reviewed to be good value for money.
My Top Ten Selection of Best Reverse Osmosis System
Below are the best reverse osmosis system review on the market, based on online reviews, features, budget, efficiency, and performance analysis.
It may sound easy to describe an ideal RO system or to inform you about various things to consider before choosing an RO system. But wouldn’t it be better if we give you some examples of the RO systems and detail their pros and cons? So here are the brief reviews of ten RO systems.
The APEC RO system is one of the most efficient water filtration systems with five-stage filtration mechanism. It is known for high rejection rate and durable material quality. From one of the United States leading RO system manufacturers APEC, ROES-50 is a 50 GPD capacity filtration system that can remove up to 99% contaminants.
Various types of contaminants including chemicals such as chlorine, fluoride, organic pollutants such as viruses, bacteria, and heavy metals such as lead, arsenic are removed from the water. More than 1000 contaminants are filtered producing ultra-pure and safe drinking water. It uses all carbon filters that can absorb contaminants more efficiently than the regular GAC filters.
The materials used in the RO system are of high-quality with rigorous testing and trusted certification. APEC guarantees that the RO system will not require any leak detection apparatus as the system is completely leak-free. The fittings are all safe, and easy to fit. They don’t require any extra clips or steps to lock and seal. The connective fittings are secure and convenient.
The faucet used is 100% lead-free and made of chrome so that the purified water does not come in contact with the lead after filtration. The food grade tubing ensures pure water.
Tap water or well water can be used as input to the RO system. The resulting water would be clean, tasty, and refreshing with quality superior to that of bottled water. The purified water from the ROES-50 can be safely used for drinking, cooking, making coffee or ice. The noise-free and trouble-free RO system is a good choice if you consider its long durability and high-quality purification.
The iSpring RCC7 is a 75 GPD capacity RO filtration system with high rejection rate and certified premium material with guaranteed quality. The five stage filtration system has some more features compared to the previous APEC RO system such as designer faucet and see-through housing for the first stage of the filter.
The first stage of the five filtration stages filters out particulate sediments such as dust, dirt, and other particulate matter. The next two stages get rid of unpleasant odor and taste with carbon blocks. The fourth stage is the actual reverse osmosis layer which consists of RO membrane for filtering water. The fifth layer is an additional stage to remove any residual taste and odor.
The see through housing helps to identify when the filter cartridges need to be changed. Also, the clear housing enables consumers to see what is being filtered exactly.
The faucet has European design and is made of brushed nickel. The goose neck and long reach of the faucet are highly commendable while it has reliable quality, long life and quality material. The entire system is designed with efficient architecture and strong build.
The storage capacity of the tank is 3.2 gallons. Automatic shut-off is another good feature where the water supply is stopped as soon as the tank is filled up.
The installation kit comes with all the fittings and tools that will be required while
The iSpring RCC7 is one of the best under the sink RO systems which are good value for money.
The APEC ROES-PH75 Top Tier reverse osmosis system is a six-stage filtration system with an ability to produce superior quality purified water along with improved alkalinity and good taste.
There are six stages of water filtration to produce high-quality safe and pure drinking water which gives tasty and healthy water as good as bottled water. The first stage removes the sediments and particulate contaminants.The second and third stages are carbon blocks which can remove the VOC’s and harmful chemicals that can cause bad taste, odor, cloudiness, and color in the water.
The fourth stage removes TDS, heavy metals, and organic pollutants.The fifth stage is a coconut shell carbon layer to remove any residual bad taste and odor.
The sixth stage enhances alkalinity by adding food grade premium quality calcium carbonate.
The water produced from APEC ROES-PH75 Top Tier reverse osmosis system can be safely used for drinking and cooking purposes. The 75 GPD capacity of ultra-pure and re-mineralized water is healthy and tasty. The membrane has a high flow capacity so that the family gets an unlimited and fast supply of pure water.
The high rejection rate and capability to remove 99% of contaminants including chemicals like chlorine, toxic metals like lead, arsenic and chromium make the RO system one of the most effective water filtration systems.
It is a product from reliable manufacturer APEC which is known for high-quality and durable material. With more than two decades of experience in manufacturing RO systems, APEC ROES-PH75 Top Tier RO system is one of its top-notch products.
The Express five-stage RO filtration system removes 99% of the contaminants in the water. It has maintained industry standard quality for all its parts. It is considered as one of the best RO systems for homes by consumers.
The first stage is a five micron
The fourth stage is a Thin Film Membrane, which is the heart of the RO system as the reverse osmosis takes place exactly here. It has high rejection rate and can effectively remove bacteria and other chemicals. The last stage is also a carbon filter with inline granular carbon. It polishes the water and removes any residual bad taste or odor resulting in stabilized water.
The Express Company is known for good technical support. It provides installation manual which is easy and simple to understand. It makes the installation and replacement of the filters easy. It has swivel connections that help to replace the filters without having to remove the tubing. It avoids leakage from the membrane canister while disconnecting and reconnecting. A wrench is included in the set to help during replacement of large canister.
The unit does an excellent job in removing total dissolved solids (TDS) and deionization process serves the purpose of making the water pure and contaminant-free. The extra set of all four filters increases the life of the filters as the consumers need not look for replacement filters. The RO system can be used for another year without spending on the filters.
With a reliable brand name and quality material, it is one of the best RO filtration systems in its price range.
One of the disadvantages of reverse osmosis systems is that it removes dissolved minerals that are required for the water to be healthy. To combat this issue, iSpring RCC7AK has a particular stage for alkalization of water adding back the required calcium and magnesium minerals after reverse osmosis process.
There are six stages of filtration with various arrangements including polypropylene (PP) sediment filter to remove particulate matter, two carbon blocks - granular active carbon (GAC) and carbon block (CTO) to remove harmful chemicals and other dissolved solids, reverse osmosis filter with semi-permeable membrane that removes a wide range of water contaminants. The last stage is a Corosex with calcite layer that works on alkalization of purified water.
The filtration system effectively removes bad odor and taste by removing contaminants such as Polyaromatic hydrocarbons (PACs), BTEX, phenol, and other halogenated substance. Chloramines which are considered to be a tough contaminant is efficiently removed by the iSpring RCC7AK RO system. Organic pollutants such as cryptosporidia, giardia, and other parasitic cysts are also removed by the iSpring RCC7AK RO system.
The best part of iSpring is that they are all ears for the reviews from consumers. They have taken up the customer feedback seriously and worked on rectifying some of the concerns. Post July 2014 there have been some upgradations like the European style ceramic valve with Brushed Nickel in place of the earlier version of gooseneck chrome faucet, feed water adapter that was moved from behind the sink to well-exposed shut-off valve, better quality storage tank and automatic shut-off valve, flood alarm, and better installation guides on YouTube.
A quality product from a premium Company is always a good choice. iSpring RCC7AK RO system is not only a reliable product but a product that has been the best choice for consumers looking for safe, pure, healthy, and tasty drinking water.
Most traditional Reverse Osmosis systems demineralize the purified water. When the filtered water is stored in the tank, it reacts with the rubber bladder and dissolves some of the minerals in it. This makes the taste of the water unbearable. Artesian Full Contact RO system has patented a second re-mineralization process to bring back the alkalinity in the purified water so that the water tastes superior to the bottled mineral water.
The Home Master TMAFC RO system has seven stages of water filtration. It ensures removal of 99% of contaminants. It can effectively remove chemicals such as chlorine, dissolved solids, heavy metals, any pharmaceutical pollutants through sediment and carbon filters along with the most advanced reverse osmosis process.
Using the patented Full Contact remineralization process, it adds essential minerals like calcium and magnesium twice at different stages of filtration. It helps the storage tank degradation and balances the pH level of purified water.
The modular design ensures easy installation with the set getting delivered with an assembled purification unit, filter set that can serve for a year, feed water adapter, and faucet adapter. It does not require tools such as wrenches to open up the canister as the filter housing in the canister is designed to be a single unit. There is no room for leakage as the design does not allow sediments or microbes to accumulate in the canister making it sealed by contaminants.
The components of the Home Master TMAFCArtesian Full Contact RO system has an architecture that supports flow restriction to regulate the water pressure. It also helps to minimize water wastage. The RO system has a capacity of 50 GPD.
It is known for its exceptional design and ultra-pure water production with faster water flow rates compared to other RO systems.Solving many problems that are seen in traditional RO systems, it can provide mineral water on tap.
The five-stage 90GPD RO filter is an amazing product from APEC. It provides water that is refreshing and has a crisp taste. The flow rate is high compared to other RO filters and it can remove 99% of the contaminants in the water.
It has 100% lead-free faucet and food grade tubing to provide contaminant-free drinking water. The filters are designed to last longer compare to other RO systems. They need not be replaced for a year.
The installation is easy with their detailed user manual and YouTube video demonstrates the installation that’s a much better guide than reading a manual. The connections are convenient and secure. The RO unit is leak-free and the quick fittings do not need any extra steps or lock clips. It is noise and trouble free.
The quality is nowhere compromised in building the system. APEC has a unique feature of conducting eight hours of rigorous lab testing before shipping each of its Top Tier RO-90. It ensures no imperfections of the RO units when it is delivered.
The five stages of filtration are capable of removing over 1000 types of contaminants including lead, chemicals, and other VOC’s. The first stage is a polypropylene (PP) sediment filter that removes particulate matter. The second and the third stages are premium quality extruded carbon blocks that can remove bad taste and odor from water. The fourth stage is a DOW chemical FILMTEC reverse osmosis membrane with high rejection capacity. The fifth stage is Total Contamination Removal (TCR) filter made of coconut shell carbon that can remove any residual taste and odor from the tank.
All-in-all, it is a super-capacity filtration system with leak-free fittings, easy to install design, durable filters, and has the capacity of producing 90GPD of tasty and ultra-pure water.
Brondell's Circle Reverse Osmosis Water Filtration System is one of the leaders in RO filtration systems. It produces ultra-pure drinking water. It also has an efficient and compact design, water-saving capacity, and patented technology that’s implemented to eliminate the pressure of the back-water.
The filtration system has four stages of filters. These filters can efficiently remove harmful chemicals such as chlorobenzene, fluoride, trivalent and hexavalent chromium, atrazine, Pentavalent Arsenic, Trihalomethanes, Aesthetic Chlorine, Methoxychlor, Benzine, Endrin, DBCP, and dissolved metals like Lead, Cadmium, Barium, and Radium. The RO system is an excellent provider of healthy and safe drinking water for a family.
It has a unique circular tank design to avoid back-water pressure and save 2.4 gallons of water on an average.
The RO membrane is also devoid of the pressure giving it a longer and productive life. The water saving capacity is much better than any other RO systems. The faucet has an LED indicator to indicate filter change.
The circular tank and the filters are designed to be easily installed and replaced. The water filters are a twist and lock quick connects with the auto-flushing ability for easy maintenance. The tank can fill faster without any necessity of electricity or additional pumps.
It can give the best tasting and ultra-pure water from the input hard water. It can refill the tank within about 40 minutes and can provide fast-flowing water for an entire day for a family.
The Brondell H2O+ Circle RO system is ten times more efficient than the other traditional RO systems on the market with a water-saving design and energy-saving water purification method.
The reverse osmosis technology is becoming a preferred water purification technology due to various reasons. The main benefit of RO is that it can provide water that is as pure as bottled water. But the cost would be much cheaper and you would get the purified water at your homes without the hassles of plastic bottles or containers making it eco-friendly.
The four-step filtration system purifies most of the contaminants in the well or municipal-supplied water. Sediment pre-filter removes the silt and other particulate matter. The carbon pre-filter removes unpleasant taste and odor due to chlorine and chloramines. The RO filter with an efficient semi-permeable membrane removes 96% of total dissolved solids and 99.9% of organic pollutants such as cysts, viruses, and bacteria.
Nitrates and nitrites are also removed effectively by the state of the art system. The final stage has a carbon post-filter for polishing the drinking water.
The filters are designed to be easily replaceable. A push button mechanism removes the filter cartridges and an auto shut-off valve on each filter control the water flow without the need to shut down the water supply or wait for the system to depressurize. The filters snap into their place and can be handled individually. The faucet has a high-end design with an air gap. It is a top mount faucet with an electronic monitor which indicates when to change the filters.
The Watts Premier RO Pure 531411 is a satisfactory system for those who look out for a purifying system that is convenient to handle and provides quality performance.
Home Master TMAFC-ERP RO system has seven stages of filtration which produce clear and great tasting water. The full contact technology patented by Home Master is an excellent purification system with a facility to add essential minerals twice in the purification process. The most health conscious people can rely on it to provide healthy and pure drinking water.
The design of the system has combated many issues in the traditional RO systems such as flow rate and water saving mechanisms. The RO unit has built-in non-electric permeate pump to reduce wastage of water.Perfect water technologies have incorporated a permeate pump so that the unit can reduce the water wastage by 80% and increases the water production by 50%.
The system also avoids canister leakage and water getting slightly acidic in the storage tank. Often the canister housing is a separate unit. While in Home Master TMAFC-ERP RO system, the filter is disposable with the housing.The innovative design avoids accumulation of microbes and other sediments inside the housing when filter alone is changed.
You will not require wrenches or hard work with other tools to replace the filter with its canister.The filter replacement is easy with the modular design and push-in fittings.
Catalytic carbon is used which can remove the stubborn chemicals from the water. Chloramines which are one of the most difficult contaminants are removed effectively by the Home Master TMAFC-ERP RO system. The remineralization process adds the essential calcium and magnesium minerals amounting 30 to 60 mg/l in total which is the required amount for the water to be considered healthy.
The bottom line is that the RO unit is an excellent product which produces clean, clear, and healthy drinking water with high flow rate and lesser water wastage.
Which Type Of Reverse Osmosis System Is the Best?
As seen above, there are several types of reverse osmosis systems in the market. It would be difficult to name one of them as the best as each of them serves a different purpose. Depending on your requirements, you could choose one of these types and the best RO filter in that type.Here are a few categories that can be considered.
Different stages involved in the filtration process
There are three to nine stages of filtration in the RO systems. Typically residential RO systems have up to seven stages and nine stages may be required if the RO system is being used to produce more than just drinking water. Each stage is designed to remove a specific type of contaminant.
The three main stages include pre-filter to remove sediments and activated carbon filter to remove other chemicals causing bad odor and taste. As the number of stages increase, each stage is involved in removing specific type of contaminants such as particulate matter, sediments, chemicals, organic pollutants, bad taste, and odor.
Some stages are designed to add the minerals that may have been removed during RO process. The pH level of the water is balanced through alkalization. Calcium and magnesium are added in sufficient quantity to ensure the water is healthy and pure.
It may not be true that as the number of the stages increase, the quality of purification increases. But it only indicates a dedicated stage for purifying different types of contaminants. Additional stages such as remineralization are an obvious plus. When you know what kind of contaminants is present in the water supplied, it can be easier to choose the RO systems that suit you.
Depending on the presence of chlorine in the water, the RO systems can be selected. Two types of RO membranes are used in residential RO systems. Apart from this commercial RO membranes are also present that have higher capacities and cost little more.
Cellulose Triacetate (CTA) is that type of membrane that can filter chlorinated water with a capacity of producing up to 20 Gallons per day. Thin Film Composite (TFC) or Thin Film Material (TFM) can filter non-chlorinated water and has higher capacities of up to 150 Gallons per day. The standard low-pressure membrane has a spiral winding and is designed to fit the regular RO systems.
TFC membranes are more common than the CTA counterparts. But when TFC membrane is used, the pre-filter should have an active carbon to remove chlorine from the water. Otherwise, TFC membrane becomes susceptible to degradation.
The commercial RO membranes are capable of operating with an input water pressure in a range between 100psi and 225psi, unlike residential membranes which operate between 40 and 100psi. The commercial membranes are capable of treating sea and brackish water.
The membranes have a longer life depending on the pre-filters. If the pre-filters can protect the RO membrane by eliminating sediments and chemicals such as chlorine, the RO membrane can survive for longer. The pre-filters are often replaced every six months while the average life of RO membrane is about a year.
The RO membrane forms the heart of the reverse osmosis system. That means, the type of RO membrane should be able to purify the type of water that you input into the RO system.
Under the sink or countertop
Depending on where the RO systems can be installed, its portability, and the design, they can be categorized as under the sink and countertop RO systems.
Under the sink RO systems are installed under the sink as its name suggests.If the kitchen cabinet is too small, the consumers find a different location from where the water can be supplied easily. They have higher capacities and can be used for large families and commercial purposes. They cannot be portable easily but can be fixed in your kitchen or close to a water supply. They often do not store filtered water. But they filter the water once the faucet tap is opened and release the purified water. They may cost a little more than the countertop RO systems but are a reliable source of unlimited supply of purified water.
The countertop versions are often compact and are easily portable. They are easy to install and can be most useful for small families. They can be ideal if you are looking for a cost-effective and efficient RO system that can suffice your daily needs of drinking water. They may not be great for large families or commercial usage as it does not produce a large quantity of water.
Both the RO systems have different stages of filtration. They can have all other facilities such as carbon blocks, easily replaceable push-button filters, and remineralization processes. Depending on what amount of water that you require daily and where you would use the RO system, you can choose one of the above two types of RO systems.
Home Master and APEC have ruled the industry for quite some time and are leaders in producing efficient RO systems. Both have tremendous experience and have earned patents for their technologies. After a lot of analysis, Home Master series can be considered as the most recommended product. They are available in both under the sink and countertop versions.
Home Master TMAFC-ERP Artesian Full Contact RO System is one of the best in under the sink categories. It has all the efficient features required to produce ultra-pure water which is re-mineralized effectively to make the resulting water healthy as well.
The elaborate stages ensure removal of most types of contaminants. The other enhancements such as permeate pump to reduce water wastage, innovative architecture making it easy to install and replace filter cartridges without the need for complex plumbing tools are additional benefits.
Home Master TMAFC Artesian Full Contact RO is the best among the countertop versions. It also has elaborate stages of filtration with an efficiency of removing 99% of the contaminants. The modular design helps easy installation and replacement.
The patented remineralization ensures producing high-quality water that is superior in taste to bottle water. You can get mineral water from your tap whenever required. The RO system resolves many traditional problems such as flow rate and high quantity of water wastage.
Reverse Osmosis is a technology that has been at the helm due to its efficiency of purifying water. There have been many models of RO systems that are in the market and it may be difficult to choose the best one. The only way to choose one of them is to understand your requirements and know the specifications of the RO systems.
There are a few leading RO system manufacturers and some of the best models are reviewed above. With information on how exactly each of the factors in the RO system affects your requirements; you are equipped to select the best one that suits you. Sometimes you may have to pick an RO system based on the requirement that has the top most priority. For instance, if you are supplied with chlorinated water, you require an RO system that can remove chlorine effectively from the input water.
It would be better to contact your county’s water authority or search for the information online to verify what contaminants may be present in the water supplied to you. There are many tests available that can be done at home to identify the contents in the water supplied. There are apparatus that can measure other parameters such as TDS, amount of minerals present in water, and others.
Each one of these RO systems may be good in one of their features, but there cannot be many that can satisfy most of your requirements. Recommendations from friends and relatives can help to narrow down the selection.It would be the best to walk into a store nearby and verify the taste and odor of the water after filtration.When you know the priority of your requirements, it is easier to choose an RO system. The best option would be to make a note of all your requirements, prioritize them and then start hunting for an RO system.
With all the information handy and a fair knowledge of the common terminologies, you will be able to pick the best RO system for you. Hope all the information provided here helps you understand different RO systems and their capabilities.