Reverse Osmosis Water Filter Systems

            Have you ever considered that tap water can do you more harm than good? According to specialists, tap water can be filled with all sorts of contaminants and pollutants and only by using a water filtration system you can efficiently remove them. A great example of a water filter is the reverse osmosis system as it uses a semipermeable membrane to deliver you safe water for drinking and cooking.

            Therefore, our purpose is to help you purchase the best system without spending too much time searching for it. We thoroughly analyzed the most popular models on the market and compared them for you. Each of these systems was specially designed to successfully remove dangerous contaminants from water. In this way, the water you will drink at home will be highly improved and totally safe.

Top Reverse Osmosis Systems Comparison

1. Pelican Water PRO-RO-PC Pro 6-Stage 2. Aquasana OptimH2O 3. Home Master TMAFC 4. APEC Top Tier 5-Stage 5. iSpring RCC7
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General Information

Dimensions (HxWxD) 14.5 x 12 x 14.75 in. 12.5 x 4.5 x 12 in. 20 x 16 x 13 in. 17.5 x 16 x 5.25 in. 18 x 14.5 x 6 in.
Weight (lbs.) 11 12.3 14.1 26 25
Installation Type Under Sink Under Sink Under Sink Under Sink Under Sink
Faucet Included Polished Chrome Faucet Brushed Nickel Faucet Chrome Faucet Chrome Faucet Brushed Nickel Faucet

Technical Specifications

Daily Production&Tank Capacity
Daily Production (GPD) 50 35 50 50 75
Tank Capacity (gal.) 2 3.2 3.2 4 3.2
Water Requirements
Operating Pressure (PSI) 40-80 40-100 40-95 40-85 45-70
Operating Temperature (°F) 40 – 100 40 – 100 40 – 100 40 – 100 40 – 100
pH Limits 4-8 4-10 4-10 2.0-11.0 3.0-11.0


TDS Reduction&Number of Contaminants Removed
TDS Reduction 93.1% 96.3% 99% N/A 95%
60+ Contaminants Removed
Average Percent Reduction of the Common Tap Water Contaminants
Arsenic 99% 97.6% 98.7% Up to 99.00% 94-96%
Barium 98.8% 95.2% 97.9% Up to 99.00% 90-98%
Chlorine 99% 97.66% 99% 100.00% 94-95%
Chromium 6 98.3% 97% 91.3% Up to 99.00% 96-98%
Chromium 3 99% 96.6% 94.1% Up to 99.00% 96-98%
Copper 98.4% 96.6% 99% 96% 97-99%
Fluoride 93.8% 95.7% 93.9% 93% 94-96%
Lead 96.8% 96.6% 98.6% 96% 96-98%
Selenium 97.9% 97.9% 92% Up to 99.00% 97%

Filters&Filters Replacement

Number of Filters 5 3 3 4 4
Sediment Prefilter Carbon Prefilter Sediment Filter Polypropylene Sediment Filter Polypropylene Sediment Filter
Granular Activated Carbon Pre-Filter Reverse Osmosis Membrane Carbon Filter Carbon Block Filter Granular Activated Carbon Filter
Granular Activated Carbon Filter Claryum Carbon Postfilter Reverse Osmosis Membrane Carbon Block Filter Carbon Block Filter
Reverse Osmosis Membrane Remineralization Filter Remineralization Filter High Rejection TFC Reverse Osmosis Membrane High Rejection TFC Reverse Osmosis Membrane
Granular Activated Carbon Postfilter Coconut Shell Refining Carbon Filter  Total Polishing Inline Post Carbon Filter
Remineralization Postfilter
Stages of Filtration 6 4 7 5 5
Filters Replacement Interval
4-Stage Membrane Every 18 Months Carbon Pre-Filter & Claryum Post-Filter Every 6 Months Filters Every 12 Months 1-3-Stage Filters Every 6-12 Months 1-3-Stage Filters Every 6-12 Months
2-Stage Post-Filter Every 6-12 Months RO Membrane Cartridge Every 12 Months RO Membrane Cartridge Every 3-5 Years RO Membrane Cartridge Every 2-4 Years RO Membrane Every 2-3 Years
Remineralizer Every 12 Months 5-Stage Filter Every 2-4 Years Post Carbon Filter Every 6-12 Months


LED Filter Life Indicator Filter Change Indicator Modular Filter Design Automatic Shutoff Automatic Shutoff
30% More Flow From the Faucet Automatic Shutoff
Compact Design 50% More Flow Rate
Full Contact Technology


Warranty 1-Year Warranty 2-Year Limited Warranty 5-Year Limited Warranty 1-Year Warranty 3-Year Warranty
Money Back Guarantee 90-Day Guarantee 90-Day Guarantee 90-Day Guarantee 30-Day Guarantee 1-Year Guarantee
User Manual
Customer Support

Reverse Osmosis Systems Evaluation

1. Pelican Water PRO-RO-PC Pro 6-Stage

            If you want to opt for a reliable water filtration system, go with Pelican Water PRO-RO-PC Pro 6-Stage. This model can be installed under the sink and it comes with a nice Polished Chrome Faucet. The compact design allows you to install it in tight places, so you can forget about the bulky models that hardly fit under the countertop. With a daily production of up to 50 gallons, this system will deliver many years of satisfying performance being at the same time easy to install and maintain.

            This system comes with 5 high-quality filters and a RO membrane. It features 6 stages of filtration, including a remineralization filter that simply adds back in calcium and magnesium to enjoy the healthiest water possible. Replacing the filters is an easy task and you will know for sure when it’s time to perform this operation as it features a LED filter life indicator. In comparison to other RO systems, this one can provide up to 30% more water flow.



Made by a trustworthy brand Short warranty
Multiple faucet designs No automatic shut-off feature
Easy to install
Small and light design
50% less water waste in comparison to other systems


Pelican Water PRO-RO-PC Pro 6-Stage is very efficient in reducing water contaminants. It features a notification that lets you know when to change the filters and is compact and lightweight. With 6 stages of filtration, among which a carbon/mineral filter that remineralizes the water, you can forget about the risks of drinking tap water. The only drawback is that it comes with a short warranty, only 1 year.

2. Aquasana OptimH2O

            The next model that convinced us about its performance is Aquasana OptimH2O. Installing this system is a breeze and luckily it doesn’t occupy too much space under the sink. Besides the Brushed Nickel faucet, you can also opt for Chrome Metal and Oil Rubbed Bronze faucets but they are a little bit more expensive. The system can filter up to 35 gallons per day.

            Unlike other models that have 5 or 6 filters, this one comes with only 3 filters and a RO membrane. However, it does a great job as it can remove most contaminants with ease. For receiving the best benefits when drinking tap water, the system also restores essential minerals like calcium, magnesium, and potassium. Replacing the filters don’t require any particular skills as the filter housing twists off effortlessly.



Convenient filter change indicator No automatic shut-off feature
Reliable brand Only 2-year warranty
Easy to install and maintain
Various faucet styles
Durable construction


All in all, Aquasana OptimH2O is a great option to go with if you want to invest your money in a well-made RO system. It is highly efficient in removing the dangerous contaminants usually found in the water and it comes with all the necessary parts for performing the installation. Unfortunately, it doesn’t have an automatic shut-off features and is backed by an average 2-year warranty.

3. Home Master TMAFC

            Our next recommendation is Home Master TMAFC. It includes a stylish Chrome faucet and can be easily installed under the sink. When buying this system, you have to make sure you have enough space as it is not as compact as other models. With a tank capacity of 3.2 gallons and a 50 GPD production, this model is perfect for your house. The modular design is a great plus as the entire filter is disposable, so replacing it is quite simple.

            When it comes to performance, this particular system passes the water through no less than 7 stages of filtration. The result is clean, healthy water every time you want. Additionally, for enjoying the best water at home, the system adds essential minerals twice during the filtration process. One great feature is the automatic shutoff that makes the storage tank close automatically when it’s filled up. Last but not least, the model provides up to 50% more flow rate than standard RO systems.



Long warranty Only one faucet color
Comes fully assembled Bulkier design
Innovative all-in-one design
The water is remineralized twice
Long-lasting RO membrane


Home Master TMAFC delivers great performance as it features a seven-stage filtration process. With a high water flow rated and a double-remineralization process, this model will not only help you remove all the contaminants in the water but also drink healthy water. In comparison to other models, this one is backed by a more generous warranty, that is 5 years.

4. APEC Top Tier 5-Stage

            APEC Top Tier 5-Stage does a great job and will cost you less money. The system has to be installed under the sink but it occupies little space as it has a compact design. When you buy this model, you will also receive a Chrome faucet. It has an impressive 4-gallon storage tank and the 50 GPD membrane quickly refills it for enjoying fresh water every time.

            With 5 quality filters and 5 filtration stages that efficiently remove sediments and contaminates, you can be sure the water you’ll be drinking from now on is not only tasty but also very healthy. Furthermore, the system is quiet, easy to install, and the filters are made of superior materials. Once you buy the system, you will enjoy free lifetime technical support for any possible problems.



Generous storage tank Only 1-year warranty
Automatically shuts off when the water tank is filled up No faucet options to choose from
Durable filters Doesn’t have a remineralization filter
Features a simple installation process


APEC Top Tier 5-Stage is one of the best RO systems on the market. With multiple filtration stages to purify the water and high-quality filters, you can be sure you won’t be disappointed with its performance. To prevent any unpleasant situations, the manufacturer also added an automatic shutoff. The only major drawback is that the system is backed by only 1-year warranty.

5. iSpring RCC7

            Another great option to consider is iSpring RCC7. Just like the other models, it requires an under sink installation that is very simple and can be easily done by following the provided instructions. The included Brushed Nickel faucet is very stylish and it complements any kitchen decor. Unlike the other models, this one can filter up to 75 gallons per day, so is great for larger families.

            As about the filtration process, the system features 4 filters and 5 stages of filtration, so you can be sure that the common tap water contaminants will be significantly reduced. Furthermore, for more convenience, the model comes with an automatic shut off, so when the storage tank gets filled up, the system shuts down.



Can filter up to 75 GPD Doesn’t come with a filter to add back essential minerals
Comes with an automatic shutoff for peace of mind Only one faucet style
3-year warranty
Compact and quiet


iSpring RCC7 is an affordable RO system that allows you to enjoy unlimited clean water for many years to come. With this system, you can save money on costly bottled water and eliminate the dangers of tap water. It features a 5-stage filtration system and it comes with a convenient automatic shutoff feature. Last but not least, it is covered by a 3-year warranty, which is longer than other models. However, we would’ve wanted it to come with a remineralization filter.

6. Olympia Water Systems OROS-50

            For a more convenient price, you can opt for this system made by Olympia Water Systems. This is an under sink model and installing it is very easy, especially because the quick connect fittings are color-coordinated. Also, the flow restrictor is pre-installed. It requires a minimum of 50 psi and 40 °F and it can filter maximum 0.75 GPM. This system also includes a chrome finish faucet that measures 5 x 10 inches. The tank has a capacity of 3.2 gallons and it delivers 50 GPD. The entire system is NSF certified.

            With this filter, the water goes through 5 stages of filtration. The first one uses a 5-micron sediment filter, the second and the third one 5-micron carbon block filters, while the fourth one a RO membrane. The last stage consists of a post-carbon filter. According to the tests, the system can remove a great number of impurities from the water including arsenic, fluoride, lead, chromium, cooper, and many others. The first 3 filters need to be replaced after 6-12 months, the RO membrane after 2-3 years, and the post filter after 1-2 years. It was also tested to meet the quality standards, so you can rest assured in what concerns any possible leaks or proper internal air pressure. It is backed by a 1-year warranty and a 30-day money back guarantee.



The system is NSF tested and certified Not very compact
Comes with a nice chrome-finish faucet Short warranty
Features an automatic shut-off valve
Quick connect fitting
Great value for the price


If you want to spend less money on a high-quality water filtration system, this is a great option to consider. It is easy to install and comes with a detailed user manual. It was rigorously tested, so you won’t be disappointed by its performance. This system fits under most sinks but it’s rather bulky. Also, we would’ve wanted it to be covered by a longer warranty.

7. iSpring RCC7AK

            This is another great system from iSpring and is pretty similar to the RCC7 model. One of the main differences is that it features 6 stages of filtration. Besides the 5 stages that work together to remove the sediment, odors, and harmful chemicals, this model has a remineralization stage. After the water passes through the RO membrane is gets to the alkaline pH filter where the healthy minerals are restored into the water. This includes calcium, magnesium, potassium, and sodium. Also, the pH level of the water will be balanced.

            The system comes with a 3.2 gallons tank that can deliver up to 75 gallons per day. It requires a water pressure range between 45 and 70 psi and a water temperature range between 40 and 100 degrees Fahrenheit. The system is designed for undersink installation and it comes with a stylish brushed nickel faucet that is lead-free. The installation can be performed without the help of a professional. All the filters need to be replaced every 6 to 12 months, except for the RO membrane that has a lifetime of 2 to 3 years. The system is warranted for a period of 1 year with the possibility to return it during this period of time. To activate the warranty you have to register the system online.



Comes with a pH filter that increases the alkalinity of the water while remineralizing it Uncomprehensive instructions so you need to search them online
Includes a brushed nickel finish faucet that is lead free
All the installation accessories are included
Certified to remove almost all harmful contaminants (up to 99%)
The manufacturer offers lifetime technical support


Made by a reliable brand, this systems is one of the best you can get. It is easy to install but not by following the instruction included.. They somehow seem outdated, so it’s better to look for online information. The remineralization stage is a great addition as during the filtration, the healthy minerals are removed.

8. Express Water RO5DX

            This system provides 5 stages of filtration just to make sure you drink water without contaminants. The first stage uses a sediment filter to remove dirt, rust, and dust while the second and third stage use a carbon block filter respectively, a granular carbon filter to eliminate VOCs, chlorine, and other components that cause odor. The fourth stage, namely the RO membrane is capable of removing fluoride, arsenic, radium, or other contaminants. The last stage features a post activated carbon filter that removes any unpleasant taste or odor.

            This model can deliver up to 50 gallons of water per day with a flow rate of 0.8 gallons per minute. Some of the strongest points of the system include the doubled sealed filters for a better filtration and the leak stop valve that automatically stops water flow once it detects excess water. Also, the quick connect system is labeled and colored to set it up much easier while the brass feed adapter is suitable for under sink pipes ranging between 1/2 and 3/8 inches. It comes with a stylish chrome faucet and is backed by a 1-year warranty.



Includes a leak stop valve to stop the water flow in case it detects excess water Short warranty – 1-year
All filters feature double seals for increased efficiency Lacks a remineralization filter
Fast set-up as it comes pre-assembled and the connections are color-coded
Comes with extra replacement filters
Includes a quick connect adapter and brass feed adapter


We like this system because is affordable and easy to install. It is capable of filtering more than 108 contaminants with a removal rate of 99%. The extra filters are a great plus as well as the chrome faucet. The only drawbacks are the short warranty and the fact that it lacks a remineralization postfilter.

How We Rated the Systems

            Now let’s find out more about how the products were rated. When we looked for the best osmosis systems, we thoroughly analyzed their performance and durability, just to make sure you pick the appropriate model for your needs. Therefore, we took into consideration the most important aspects of this type of system, including how much water it can filter and what contaminants it can eliminate.

  • Dimensions

  •             Although not an essential characteristic, the size of a RO plays a significant role if you don’t have too much space available. Considering the fact that these systems are usually designed for under countertop installation, we tried to select the models that feature a compact design. Home Master TMAFC is the only exception as is a little bit larger than the other models. However, its dimensions don’t pose any serious problems as it fits most standard under sink cabinet sizes. Nevertheless, is always good to measure how much space your future system takes to avoid any unpleasant situations.

  • Faucet Included

  •             When the system you buy includes a faucet, it simply means that you will save more money. There are many manufacturers that include a faucet dispenser and all the necessary parts for installation, just to make sure you get all you need without losing time or money. Some of them even offer you the possibility to choose from more faucet colors, such as Pelican Water or Aquasana. Therefore, Pelican Water PRO-RO-PC Pro 6-Stage comes with a Polished Chrome Faucet but you can opt for Brushed Nickel or an Oil Rubbed Bronze faucet. Aquasana OptimH2O includes a Brushed Nickel faucet, but for more money, you can choose a Chrome Metal or an Oil Rubbed Bronze faucet.

  • Daily Production

  •             The daily production or the membrane capacity for a home reverse osmosis system is measured in gallons per day (GPD). The production estimated by the manufacturer can be affected by many factors, including water pressure, temperature, pH, and so on. For enjoying superior results, you have to always follow the manufacturer’s requirements in terms of water because otherwise you may be disappointed with the system performance. If you take a closer look at our comparison chart, 3 models feature a daily production of up to 50 gallons per minute. The only exceptions are Aquasana OptimH2O with a maximum production of 35 gallons per day and iSpring RCC7 that can filter up to 75 gallons per day.

  • Contaminates Removed

  •             Since the main purpose of a RO system is to remove the common tap water contaminants and to deliver unlimited clean water, it is only natural to know more about this aspect. All the models selected by us can effectively reduce more than 60 contaminants, including chlorine, copper, lead, and so on. The reduction percentage is up to 99% or even 100% in some cases, which is quite impressive. This means you will no longer have to worry about the possible health risks you expose to when drinking unfiltered tap water.

  • Number of Filters and Stages of Filtration

  •             More filters doesn’t necessarily mean more efficiency, so you shouldn’t be fooled by this information. There are many systems that deliver superior performance with only 3 filters, such as Aquasana OptimH2O and Home Master TMAFC. The model with the most filters included is Pelican Water PRO-RO-PC Pro 6-Stage. All our models come with quality filters that have been previously tested and are designed for longevity. In general, a good RO system features a sediment filter to remove dust and particles, a carbon filter to eliminate bad tastes, odors, and chemicals, and a RO membrane to remove the common contaminants like lead, fluoride, arsenic, etc. Additionally, some systems come with a postfilter that replaces beneficial minerals back into the water for good taste and nourishing properties. The systems with a remineralizer filter are Pelican Water PRO-RO-PC Pro 6-Stage, Aquasana OptimH2O, and Home Master TMAFC.

  • Warranty

  •             For more peace of mind, a reverse osmosis water filtration system should be covered by a longer warranty. Unfortunately, most units come with a standard 1-year warranty, like Pelican Water PRO-RO-PC Pro 6-Stage and APEC Top Tier 5-Stage. The models with a longer warranty are iSpring RCC7 and Home Master TMAFC. The first one is backed for 3 years, while the second one for 5 years.

Health Risks of Drinking Contaminated Tap Water

            To better understand the advantages of the water filtration systems, let’s see which are the possible health risks you expose to when drinking contaminated water. Taking the necessary measures to prevent all sorts of dangers is the wisest thing you can do. Here is what specialists say:

  • Thyroid Disorders: Water that contains fluoride can seriously affect thyroid gland. This is possible due to the fact that fluoride can suppress thyroid function, being considered an endocrine disrupter.
  • Skin Affections:Many water supplies in the U.S.A. contain high arsenic levels and this chemical contaminant is known for causing all sorts of skin affections. Additionally, some specialists say it is a carcinogen.
  • Neuromuscular Disorders:Water supply contain lead which can cause neuromuscular disorders. This metal is very toxic, so is best to eliminate it as much as possible. Once present in the body, lead can cause fatigue, concentration difficulties, or even severe brain damage.
  • Cancer and Birth Defect: Although there are many contaminants that can be associated with cancers, one of the most dangerous ones is chlorine. While it’s true that chlorine can destroy many of the pathogens in water and lower the chances to develop waterborne diseases, it is also very dangerous. It is linked to various cancers like rectum, breast, or threat cancer.
  • Best Brands to Consider

                            Although there are many RO systems available, not all of them deliver the same performance. For this reason, opting for a leading brand is an assurance that you won’t invest your money in a poor-quality system. In the water purification market industry, brands like Pelican Water, Aquasana, or Home Master are very popular because they design and manufacture innovative water filtration systems for every house.

    • Pelican Water

    •                         Established in 2007, Pelican Water is a leading brand in this industry. The main goal of the company is to manufacture superior water filtration systems that allow families worldwide to drink clean water regardless the country they live in. Furthermore, the products made by this brand are environmentally friendly and easy to maintain. Producing a wide variety of products among which UV disinfection systems or shower filters, the company is definitely a great option to go with.

    • Aquasana

    •             Another trustworthy brand is Aquasana. The company uses highly-advanced technology to produce great water filtration systems, so you can be sure you won’t be disappointed with the performance of an Aquasana product. From whole house filtration systems to clean water machine and bottles, the company covers all your needs in what concerns water purification.

    • Home Master

    •                         There are many customers satisfied with the performance delivered by Home Master products and for good reason. They found an efficient way to remove impurities from their tap water, by using best-in-class purification systems. Currently, the company sells undersink and sinktop products, but also whole house systems and garden and hydroponic systems. All of them are carefully made to provide superior results and to offer you many years of superior performance.

    • Apec Water

    •                        This leading manufacturer has more than 20 years of experience in water filtration systems. There are many products manufactured by APEC, including salt-free water softeners, residential and commercial RO systems, car wash system, and so on. The advantage of these products is that they are durable, efficient, and affordable.

                After comparing the best RO systems available, choosing the right one for your needs is definitely much easier. Unlike many water systems, the most reliable ones are produced by the top rated brands in this industry and they deliver superior performance. We believe that a great option is Pelican Water PRO-RO-PC Pro 6-Stage as efficiently removes a wide range of contaminants without affecting the water flow. At the same time, this system is environmentally friendly and it comes with a postfilter to remineralize the water. The next model we recommend is Aquasana OptimH2O as it helps reduce common water contaminants effortlessly. Additionally, it features quality filters and superior filtration while restoring the essential minerals.

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