10 Best CounterTop Reverse Osmosis Systems

Are you wondering if the water you drink is actually pure? Maybe you are afraid you might contract a disease through unsafe water? Drinking and cooking using tap water is not a good choice. The water you drink can contain toxic chemicals and hundreds of contaminants you are unaware of. 

This is why you need to make sure your drinking water is free of impurities and all sorts of pollutants and contains all the minerals your body needs.

A reverse osmosis water filtration system is a modern technology used by the latest water purifiers for clean and healthy drinking. This is why you need to opt for this newest addition to your kitchen. 

Below we have listed the best countertop reverse osmosis system along with their details for you to choose from:

DISCLOSURE: We may receive commissions when you click our links and make purchases. However, this does not impact our reviews and comparisons. We try our best to keep things fair and balanced, in order to help you make the best choice for you.

Our Top Pick



This cost-effective product is the ideal countertop filter for you and your family. It removes a wide range of 83 types of contaminants, tested and certified in accordance with the NSF standards, and requires no plumbing for installation! It filters a gallon in mere 15 minutes!

How Does a Countertop RO System Work? 

You can connect a countertop RO to any sink faucet with the help of a faucet head adapter. Once it is connected and the faucet is turned on, the countertop RO will directly take water from the faucet through a tube connected. The water will go through several filtration stages before the pure water comes out from the nozzle.

Generally, this is the process of filtration in a RO water filter:

First, when the water flows, the sediment like sand, dust particles, or any other insoluble substance is drawn by a sediment pre-filter filter. This is the most crucial step of filtration.

Next, the activated carbon filter removes chlorine and some other chemicals along with the bad taste and odor from the water. This is done during the process of absorption.

Then comes the main role of reverse osmosis membrane. After coming through the activated carbon filter, water is forced through the membrane, and 99% of all the dissolved contaminants are extracted. Here the water is almost purified.

Again, there is a second carbon filter for the post-filter that removes any remaining sediment in the water.

Some RO filters have an alkaline remineralization filter too, which adds beneficial minerals to the filtered water before it comes out for drinking. 

The countertop RO filters are not automated. You will need to monitor the whole process. Once the water has purified, it will come out of the nozzle. After collecting it, manually turn off the faucet.

Countertop RO filters also waste water during the reverse osmosis process. This is something that you cannot prevent because it is part of the process. This is how only reverse osmosis water is made.

Best CounterTop RO Systems Comparison

Image PRODUCT/ Features Rating  
Top PickAquatru AquatruFiltration Capability: 99 percent, removes contaminants like lead, chromium, copper, fluoride, radium, and chlorine
Price: $$$
Gallons per day: 54 gallons
Warranty: 1 year
Review: 4.4 stars 
Read Full Review
Budget PickCrystal Quest Portable RO Crystal Quest Portable ROFiltration capability: 99% of all contaminants including silt, sediment, Giardia, Cryptosporidium, sand, rust, dirt
Gallons per day:
50 gallons
1 year
4.8 stars
Read Full Review
Trusted PickWaterdrop WD-G2-W Waterdrop WD-G2-WFiltration capability: Can filter contaminants including heavy metals and chemical residues
Price: $$
Gallons per day: 400 gallons
Warranty: 1 year
Review: 4.7 stars
Read Full Review
SimPure Y7 SimPure Y7Filtration capability: 99.99% of contaminants including chemicals, heavy metals (Lead, Arsenic Etc), chlorine, TDS, fluoride, nitrates, nitrites
Price: $$$
Gallons per day: 90 gallons
Warranty: 1 year
Review: 2 stars
Read Full Review
KFlow KFL-CTOP Portable KFlow KFL-CTOP PortableFiltration capability: 99% removal of 1000+ contaminants including chlorides, lead, chlorine, fluoride, heavy metals, mercury, chloramine, chromium, arsenic, radium
Price: $$$
Gallons per day: 75 gallons 
Warranty: 1 year
Review: 4.5 stars 
Read Full Review
Frizzlife WA99 RO Water Filtration Frizzlife WA99Filtration capability: 99.99% removal of 1000+ contaminants including lead, chlorine, fluoride, heavy metals, mercury, chloramine, chromium, arsenic, radium, asbestos.
Price: $$$
Gallons per day: 400 gallons
Warranty: 2 years
Review: 5 stars
Read Full Review
Brondell Circle Brondell CircleFiltration capability: Removes industrial and harmful chemicals, lead, chlorine, radium, mercury etc
Price: $$$
Gallons per day: 56 gallons
Warranty: 1 year
Review: 4.3 stars
Read Full Review
APEC RO-CTOP APEC RO-CTOPFiltration capability: Removes up to 99% of total dissolved solids (TDS) and contaminants such as arsenic, lead, fluoride, chromium, radium, and much more.
Price: $$
Gallons per day: 90 gallons
Warranty: 1 year
Review: 4.5 stars
Read Full Review
Express Water Countertop Express Water CountertopFiltration capability: 99.99% of the significant components including Lead, Chlorine, Fluoride, Arsenic, Cadmium, Chromium, Hydrocarbons, etc
Price: $$
Gallons per day: 100 gallons
Warranty: 1.5 years
Review: 4.6 stars
Read Full Review
NU Aqua 600 NU Aqua 600Filtration capability: filters contaminants including heavy metals and chemical residues
Price: $$$
Gallons per day: 600 gallons
Warranty: 5 years
Review: 5 stars
Read Full Review

Best Countertop Reverse Osmosis Systems Reviewe

1. Aquatru Countertop RO Water Filtration System

AQUA TRU Countertop RO Water Filtration System

The classic Aquatru countertop reverse osmosis system is the most popular countertop RO water filter. A simple, compact, and sleekly designed AquaTru is all that your kitchen counter needs on it.

It is one of the best portable reverse osmosis systems that work on ultra-reverse osmosis technology. You can place it on a kitchen counter for easy access to purified, healthy water just at a single touch of a button.

Being child-friendly, it also comes with a one-time push button.

Also, the unit has an uncomplicated setup. It is pretty effortless to install it manually, which means no need for plumbing! The installation takes just a few minutes. After setting up, provide the water supply, switch it on and leave it to run. 

The portable four-stage filtration system is also known for its quick-change portable RO water filters. They only require the simple step of twist and seal for filter replacement. The water filters are expected to be replaced after every six months for maximum efficiency. 

When it comes to water waste, the AquaTru only wastes about 25% of the water during the reverse osmosis process. 

+ Easy installation without needing a plumber
+ Wastes far less water than the standard RO system
+ Visually attractive and appealing to the users
+ Portable and compact design which takes very little space
Not equipped with the additional remineralization filter
Has a smaller tank than the standard sink RO filter

Check out our latest Aquatru RO system review to learn more about this water filter.

2. Crystal Quest Portable RO

Crystal Quest Portable RO

Are you looking for a portable RO water filter that is a zero installation purifier? Maybe you wish to opt for a portable version; the Crystal Quest Portable RO system is an ideal choice. It is suitable for homes, apartments, recreational vehicles, and even laboratories.

Being 16x7x7 inches in size, it is the most compact and portable countertop RO water filter we know. Plus, it can be attached or detached to any standardized faucet in no time without any hassle.

The system works on a 10-stage filtration process to ensure water quality and deliver purified water in the best state.

It is known for efficiently removing various contaminants, including heavy metals like lead, copper, mercury, cadmium, aluminum, and total dissolved solids by the electrochemical process.

Moreover, you can customize your countertop RO system by opting for additional filter cartridges for different substances such as nitrates, fluoride, and arsenic. There also comes an optional Washable Pre-Filter.

+ Highly portable
+ Comes with different optional filter cartridges, which the user can order according to the contaminants in the water
+ Pretty easy to install and connect to your kitchen faucet
+ Takes very little space
The water filtration process is a little slow as the system does not use any pump.

3. Waterdrop WD-G2-W

Waterdrop WD-G2-W

The Waterdrop WD-G2-W offers excellent countertop reverse osmosis performance. It has a built-in booster pump that provides appropriate pressure and manages to produce a standard-sized drinking water glass in just 12 seconds.

It is a tankless RO water system. The water flows straight to the faucet immediately as the system is turned on. Furthermore, it saves far more under-sink storage space than any ordinary RO system.

Slim and compact design, you can easily fit the system in an under-sink area without taking much space. 

This waterdrop RO system package also includes a lead-free faucet for easy installation. Besides, the system features an activated carbon block filter. This filter reintroduces minerals to the RO purified drinking water to minimize acidity and remove unpleasant odor and smell.

Also, you don’t need to worry about any leakage. The built-in leakage protector detects leakage and turns off the water and power supply itself.

+ The built-in booster pump speeds up the water flow, forcing water through the RO membrane and preventing post filter backflow, which leads to water wastage.
+ Due to the tankless design, the drinking water is always fresh, unlike stored water.
+ The compact and slim design makes it easier to store and takes relatively less space.
+ Produces much less wastewater than the ordinary reverse osmosis membrane filters
Being tankless, it takes more time if you need to fill larger jugs.
Slightly costly than other countertop water filters in the market

To learn more, check out our Waterdrop RO review.

4. SimPure Y7

SimPure Y7

If you are searching for more innovative, compact, and user-friendly countertop RO systems, then SimPure Y7 is the best choice.

The highly efficient SimPure countertop reverse osmosis water purifier uses no chemicals. Moreover, it also gives absolutely no by-products while removing 99% of water contaminants and heavy metals through its excellent UV purification system combined with 3-Stages RO Filtration System.

Having a stylish design, SimPure is all set to give your kitchen counter a great look. The latest technology works on a simple touch operation that makes it easier than ever to operate.

The system also owns indicator lights which tell when the system is filtering water if the feed water RO membrane needs replacing. Moreover, it will notify you if you need filter replacement or little maintenance. It is truly a smart system!

It also comes with a flush feature which is to remove contamination from the filters.

Using the Recycling Multi Filtration Technology, it has the lowest drainage ratio among RO system products in the market. The percentage of pure to drain is 5:1, which is a lot more efficient than any other RO system.

+ Comes fully assembled for easy installation. No plumbing is needed.
+ Requires minimal maintenance
+ Features smart light indicators
+ Highly efficient in purifying water
The amount of wastewater produced is a little high.

5. KFlow KFL-CTOP Portable

KFlow KFL-CTOP Portable

Appearing just like a coffee maker, KFlow KFL-CTOP Portable is the best zero installation purifier. It is super easy to use and maintain without any hassle.

Giving top Filtration Performance, it adopts 4-stages filters: Polypropylene Filter, Carbon Block Filter, RO Membrane Filter, and Coconut Carbon Block Filter. KFlow reverse osmosis system can block 1000+ kinds of contaminants, including heavy metals, to ensure you enjoy the best quality water.

 In contrast to the conventional high-consumption under-sink filter system, KFlow uses recycling multi filtration technology, which enables it to reuse wastewater. Instead of going to waste, the untreated sewage enters the filtration process and is recycled. This lowers the amount of wastewater significantly.

It also includes an electronic indicator light to warn you when the filter cartridges need to be replaced. That means you won’t need to keep a check on it now and then.

Also, its portable design lets you have it in your Living room, kitchen, bedroom, or office. You can place it anywhere.

+ No installation is required. Just plug in and use it!
+ Features electronic filter indicator
+ Works on 4 Stage RO Filtration System
+ Portable design
+ Wastewater is reused due to recycling multi filtration technology.
The tank needs to be cleaned from time to time as the filth accumulates at the bottom over time with use.

6. Frizzlife WA99 RO Water Filtration

Frizzlife WA99 RO Water Filtration

The Frizzlife WA99 RO Water Filtration is one of the best countertop reverse osmosis water systems in the market today. It is supported by advanced water recycling technology that efficiently reuses wastewater. The ratio for filtered water to wastewater is just 5:1.

Being portable, it is a plug-in and use system and requires zero installation. All it needs is a power outlet, and you can place it anywhere you wish. All the system components are enclosed in a sleek case that you can place at the top of any counter, table, or shelf.

Frizzlife WA99 countertop reverse osmosis water filter system also features a built-in smart screen that tells the remaining lifespan of each water filter cartridge so that you know when to replace filters.

The system is based on four stages of water filtration to ensure that the water comes out in the best state. These filters include a High-grade sediment filter, Coconut carbon block filter, activated carbon pre-filter, USA-made RO membrane, and Granular coconut carbon filter.

An internal water reservoir inside the system holds filtered pure water with the best water quality until your next glass of water.

+ No installation required with easy maintenance
+ Filters are independent and easy to replace in no time
+ Produces very little wastewater when compared to conventional RO systems
+ Features smart filter life indicators
Does not chill water
The smart screen can be sensitive.

7. Brondell Circle

Brondell Circle

The Brondell Circle countertop reverse osmosis water system is one of the best under sink reverse osmosis water filters with a modern, compact, and sleek design.

This reverse osmosis countertop water filter comes with a sleek designer faucet. The faucet has a built-in LED indicator that alerts the user when a sediment filter in the system requires filter replacement.

The most striking feature of these countertop RO systems is their smart valve. The smart valve prevents the backflow of water once it has passed through a semi-permeable RO membrane. This speeds up the process, provides purified water more efficiently with less tap water loss, and guarantees excellent tasting water.

To provide a more consistent water flow rate, its flexible reservoir expands and contracts and keeps water pressure at a steady level. The smart valve and the water reservoir make it the most efficient Reverse osmosis water filter.

The system is simple to install and relatively easy to maintain. It works with four independent water filtration stages for removing all sorts of industrial and harmful chemicals. These stages include sediment filter, pre-carbon plus filter, reverse osmosis membrane filter, and post filter.

+ Highly efficient. Wastes much less tap water
+ Compact unit and pretty simple to install
+ Its four-stage filtration system efficiently removes a wide variety of impurities.
+ Auto filter flush extends the lifespan of RO semi-permeable membrane.
Does not include a remineralization filter
If the user is not so mechanically skilled, they will need a plumber for the installation.



APEC portable reverse osmosis system is one of the best portable reverse osmosis systems to provide purified water with your kitchen tap water.

It can hook up to any standardized faucet in minutes and requires no installation. However, it is not compatible with pull-out faucets, sprayer faucets, and special-size designer faucets.

The countertop water filter features an optional silver aluminum case, too, so your countertop looks great!

The osmosis water filter system is compact and lightweight. No worries about the space it will take, and it is perfect for traveling too. APEC Water systems use the highest grade 4-Stage ultra-pure system. It gives the purified water a refreshing crisp taste better than bottled water. 

The excellent water filter in its design includes a five-micron sediment filter. Moreover, it also has a coconut shell granular activated carbon filter, a semi-permeable reverse osmosis membrane, and another coconut shell granular activated carbon filter for post-filtration.

These key features make APEC RO-CTOP perfect for apartments, condos, motor homes, retirement homes, students & travelers.

+ You do not need to install it. Just plug and play!
+ Uses only BPA-free materials
+ Lightweight and compact in design. Perfect for traveling!
+ Easy filter replacements with quick connect fittings.
Considering the features, a bit too pricey.
 No dispenser. There is a small tube for the water outlet.

Check out our latest APEC RO-CTOP review to learn more about this system.

9. Express Water Countertop

Express Water Countertop

If you are looking for the easiest to install reverse osmosis water filtration system, the express water countertop is for you.

It is easy to install and takes a few minutes. Its design uses an easy 4-point installation that is suitable for most of the standard faucet types. Still, it comes with three faucet adapters just in case your faucet is a different one to make it a sure bet for installation at any place.

The system uses four-stage water filtrations to achieve outstanding results. It is tested for removing 99.9% of major impurities. The system uses a sediment filter for dust and sand particles, a Granular Carbon Filter to remove chlorine and volatile organic compounds. It also has a Reverse Osmosis Membrane for the main work and a Post Activated Carbon Filter for post-filtering.  

The system is also known for just requiring minimal maintenance once it is set up. The filters that the system uses are long-lasting. Furthermore, the replaceable water filter cartridges and quick-connect make it even easier to replace filters.

+ Four-stage water filtration ensures excellent water purification.
+ Compact design that requires less space
+ Comes with three faucet adapters for easy installation
+ Requires minimal maintenance.
No remineralization filter included.

10. NU Aqua 600


The NU Aqua, a four-stage tankless countertop reverse osmosis water filter, can be an ideal choice for you if you are hunting for an efficient and compact reverse osmosis water filter system.

Its impressive 600 gallon-per-day capacity and 2:1 pure to wastewater ratio make it a more efficient RO system than any other traditional RO unit.

It also features an RO membrane with long-time span-36 months, which is a year longer than an average RO system.

NU Aqua’s 2 stage filtration system consists of Polypropylene / Carbon Block Filter, Granular Activated Carbon Filter, and a semi-permeable 600 GPD RO Membrane.

Inside the body, the Ultra-quiet integrated booster pump ensures fast processing and immediate drinking water delivery by its direct flow system. Moreover, it includes replaceable water filter cartridges too with a simple twist-lock system.

The unique feature that makes this the best countertop Reverse osmosis system is the RO faucet’s LED ring. The LED ring glows blue when the system is working normally, and red tells you to replace one of the reverse osmosis water filters.

+ Easy to install with minimal maintenance
+ Equipped with remineralization filter
+ Space-saving due to compact and tankless design
+ The pure water to wastewater ratio is quite efficient.
+ RO membrane has a longer lifespan than usual.
Does not have a robust initial pressure being a tankless system

What Is a Countertop Reverse Osmosis? 

A countertop reverse osmosis is a specifically designed countertop water filter system that can be conveniently placed on kitchen countertops. It combines several stages of reverse osmosis into one. The portable countertop RO is super-efficient for eliminating 99% of the total dissolved solids in drinking water and provides better quality, pure, healthy, and great-tasting water.

Mainly reverse osmosis systems are designed for under-the-sink installation. Those are not usable for people renting their homes because of the permanent modifications required to be made to the drain system and kitchen sink counter. The portable countertop reverse osmosis system is the best solution to it. 

The compact design for countertop RO is beneficial in domestic use and traveling due to its versatility. It is easy to install without any specific tools or drilling. You can instantly attach or detach a countertop RO from any existing faucet in just a few minutes.

Not only the countertop filtration system but all RO systems are increasingly getting popular due to their unique feature, RO semi-permeable membrane, which contains tiny pores throughout the surface. The pores are so small that it only allows water molecules to pass through them, and filtration is done in the best way.

Reverse Osmosis Water Filtration System  and Traditional RO Compared in the frame

How to Choose a Countertop RO System for Your Home? 

Following aspects must be considered when choosing a countertop RO system for the home:

Counter Space Available

Whatever kind of reverse osmosis countertop you are looking for, you should consider the space required for it. Whether you have enough space available or not?

If the space on your countertop is inadequate, go for a smaller system without a tank that does not take up much space. 

Measure the space you have available. Then compare it with the dimensions of the reverse osmosis countertop you are considering and make a wise decision.

Water Pressure

Water pressure plays a vital role in reverse osmosis water filter systems that connect to kitchen faucets. The higher the water pressure, the better the results. If the flow rate of water is reasonable, the water will speedily pass through the RO membrane, limiting water waste.

But if you use the RO water filtration system powered by electricity, the water pressure should not be your concern. Electricity will power the process at a suitable speed itself.

Water Produced vs. Water Wasted 

It is inevitable for the water to waste in the process of reverse osmosis. When water is produced on the back end, it is destroyed as well.

When the unfiltered water goes through the RO semi-permeable membrane, some water contaminants are unable to pass through. The system sends these down to the drain instead of stacking up onto it. This is how it wastes water unwillingly. 

Mostly these RO filter systems have a ratio of 4:1 of water produced to water wasted. However, the systems are being improved in an attempt to lower the percentage of water wasted.  

Saving money with Countertop RO system illustrated


Check the faucet to which you will be attaching the RO filtration system. It should be standardized so that the faucet head adapter of the faucet water filter system can be easily joined.

Storage Capacity

You need to consider the storage capacity only if you are going to buy a RO filter that does not attach to a faucet. These kinds of filters are stand-alone and have a storage tank that needs to be filled with water. They are not automated. It would be your duty to refill it once all the water is consumed.  

Then you must be looking forward to getting the one with the maximum storage capacity to reduce your work. Usually, RO filter systems come with a standard storage capacity of 1 gallon.

The Lifespan of the Filter

You must always know about the lifespan of an RO water system before getting one. Filters having short lifespans are not beneficial in the long run. They cost more than they should be. Try to get a pre-filter and a post-filter having six months of lifespan at least. And reverse osmosis filter membrane with a lifespan of 2 years minimum.

Remineralization Needs

Some of the countertop reverse osmosis filters have a filter for remineralization, while some do not. The alkaline remineralization introduces beneficial minerals to the water post-filtering before it comes out.

So, if you prefer remineralization and want to maximize the benefits of water, you will need to look for a countertop RO that offers room for remineralization. 


Well, we all want only the products that are stylish and have a great design to be placed on our kitchen countertops. You should look for the RO filter with a great design and goes with your kitchen theme. 


The certification will let you drink your water peacefully, and you will have in your mind that the portable RO filter system has been checked and approved by a third party for its claim of filtering contaminants.  


After all, price matters in everything. Think about all the pros and cons. Analyze them. Make a decision if the price matches the features. If it suits you, go with it!

FAQs on 10 Best CounterTop Reverse Osmosis Systems

What contaminants do reverse osmosis filters remove?

A reverse osmosis filtration system can filter up to 99% of all dissolved contaminants, including traces of heavy metals, dissolved salts, bacteria, and pyrogens.
The RO filter membranes refine contaminants that are relatively larger than water molecules and are highly ionized.
However, you cannot expect it to remove 100% bacteria and viruses.

Is a reverse osmosis system more efficient than other water filtering methods?

There are numerous kinds of water filters. These water filtration systems commonly use activated carbon.
The carbon filters tend to remove volatile organic compounds, but they fail at filtering other contaminants. At the same time, reverse osmosis filtration systems can reduce a wide range of contaminants thoroughly. But, they are less effective at purifying organic chemicals.

Is a reverse osmosis system more affordable than bottled water?

Suppose a household consumes three ¼ gallons per day at $0.96/gallon. On the other hand, a standard reverse osmosis filtration system takes $1100 as the initial investment + $260 for annual service for five years. In that case, the budget for RO filtration will be $2,140. In contrast, bottled water will cost $5,635.
The choice is clear.

Is a tankless reverse osmosis system better than one with a tank?

A tankless reverse osmosis system requires little space. ­Furthermore, the water tastes fresh as it is processed at the moment. But tankless RO filters are costly without storage tanks and require electricity.
Contrarily, reverse osmosis filters with a tank are more affordable, store filtered water, and require no electricity. However, they do take more space.


Water filtration is not a choice but an absolute necessity in today’s times. Health is a priority and is something that cannot be gambled on. So the next time you are out looking for reverse osmosis filters worth your money and health, choose one from our closely surveyed list and make a smart purchase!

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