Top 5 Best Reverse Osmosis Water Purifiers (2022 Review)

Having clean and pure drinking water has always been a necessity. And thanks to reverse osmosis water systems, purifying water is now much easier than ever.

The best reverse osmosis water purifiers offer a convenient way for your family to access clean and healthy drinking water constantly.

The systems are easy to maintain and require no input after fitting. You only need to change the filters and RO membrane once or twice a year.

Aside from low maintenance, RO water purifiers are highly effective and can remove most contaminants from your tap or well water.

In this post, we review the 5 best reverse osmosis water purifiers you can find on the market today.

A Quick Chart of Our Top Picks

This system is space-saving, removes 99% of over 1,000 contaminants, has a 0.4 GPM flow rate, daily output of 500 GPD, filters water in 3 stages, has a filtered to waste water ratio of 2:1, measures 19 x 8 x 24 inches, weighs 28 pounds, and has a 30-day money-back guarantee.

This unit removes up to 82% of contaminants from tap water, filters water in 4 stages, produces a gallon in 12 to 15 minutes, is easy to maintain, requires zero installation, has a capacity of 1 liter, measures 14 x 12 x 14 inches, weighs 22.84 pounds and is supported by a 30-day 100% satisfaction guarantee.

A compact portable RO system compatible with most standard faucets, filters water in 4 stages, operates under 40-80 psi, produces 90 gallons of water per day, measures 14 x 6 x 6.5 inches, weighs 7 pounds, and has a 1-year limited manufacturer warranty.

A 7-stage RO system that adds minerals back into the water, has an 11 watts UV filter, produces 75 GPD, has a drain ratio of 1:3, is NSF/ANSI 58  certified, leak-free, measures 15 x 8 x 18 inches, weighs 20 pounds and has a lead-free brushed nickel faucet.

A 5-stage RO system made from food-grade material, has a daily output of 600 GPD,1:1 drain ratio, sensitive touch panel, a filter life indicator, is CE certified, measures  5.7 x 6.4 x 12.7 inches, weighs 20 pounds, and is easy to install.

Reverse Osmosis Water Purifier Reviews

1. Best Tankless with Remineralization: iSpring RO500AK-ORB Tankless RO System

The iSpring RO500AK-ORB is an innovative tankless under sink RO system that filters up to 99% of over 1000 contaminants in the water.

The tankless design of the system saves you under sink storage area while adding aesthetic pleasure to your kitchen.

With a fast flow rate of 0.4 gallons per minute, the RO500AK-ORB lets you experience less waiting time when filling up your glass or pitcher with clean water.

The 3-stage system offers superior filtration performance by progressively removing most contaminants from your tap water.

In the 1st stage, a composite filter (FCF500) gets rid of sand, dirt, rust, other large particles, as well as unpleasant odor and chlorine from the water.

A 500GPD RO membrane removes over 1000 contaminants, including fluoride, lead, arsenic, asbestos, etc., in the 2nd stage.

Finally, in the 3rd stage, a carbon alkaline filter (FCA500) further polishes the RO water and adds minerals back to your water to balance its pH and enhance the taste.

The system produces 500 gallons of pure water daily and can fill an 8oz cup with water within 10 seconds. Thanks to this high production, the unit can meet the water needs of a big family or company.

Another selling point of the RO500AK-ORB is its filtered water to waste water ratio of 2:1. Only a gallon goes to waste for every 2 gallons of water produced. Quite efficient, right?

It actually saves waste water by up to 400%.

With a detailed instruction manual, the system is easy to install. It is also easy to maintain with the composite pre-filter requiring replacement only once per year, the RO membrane every 2 to 3 years, and the carbon alkaline filter once every year.

The unit measures 19 x 8 x 24 inches, weighs 28 pounds, is leak-free, and is backed by a 30-day money-back guarantee.


  • Filters 500 gallons of water per day
  • Has a filtered to waste water ratio of 2:1
  • Is 4 times more efficient than traditional models
  • Has an alkaline remineralization filter
  • Features real-time TDS meter
  • Has a filter life indicator
  • Easy to install and maintain


  • Getting replacement filters isn’t easy

2. Best Countertop: AQUA TRU 90AT02AT01 4-Stage

Tested and certified by IAPMO, the AQUA TRU 90AT02AT01 removes 82% of all contaminants in the water. In fact, it removes 15 times more water pollutants than all leading pitcher filters.

The 4-stage countertop unit eliminates 99.1% lead, 97.2% chromium, 95.2% copper, 93.5% fluoride, 96.4% radium and 96.6% chlorine from your water.

It’s designed to eliminate 1000’s of contaminants that could be present in your tap water.

At 14 x 12 x 14 inches, this system is compact enough to fit your counter space. And with its sleek and elegant design, it’ll uplift the look of your kitchen.

The unit is highly effective and filters a gallon of water in 12 to 15 minutes.

No plumbing or installation is required with this unit. In fact, it will take you only a few minutes to set up hence quite convenient.

Maintaining the system is also relatively easy thanks to the quick change twist and seal filters it comes with. The filters last 6 to 24 months.

The unit has a capacity of 1 liter, weighs 22.84 pounds, is space-saving, and backed by a 30-day 100% satisfaction guarantee.


  • It takes less counter space
  • Removes 82% of contaminants from tap water
  • Takes only a few minutes to set up
  • Has long-lasting filters
  • Filters a gallon of water in 12 to 15 minutes
  • IAPMO tested and certified according to NSF/ANSI standards
  • Backed by a 30-day unconditional 100% satisfaction guarantee


  • Expensive replacement filters
  • Very low capacity

3. APEC RO-CTOP Portable Countertop RO System

The APEC RO-CTOP is one of the best portable countertop reverse osmosis systems you can find around. It provides fresh, tasty water fast and conveniently.

The system is compatible with most standard faucets but doesn’t work with pull-out, sprayer, or designer models.

It filters water in 4 stages where a 5-micron polypropylene sediment pre-filter removes large particles like sand in the 1st stage.

In the 2nd stage, a coconut shell granular activated filter eliminates chlorine, VOCs, and other common chemicals from your tap water. It also eliminates unpleasant tastes and odors, colors, and cloudiness.

Stage 3, which is the most important, involves a semi-permeable RO membrane (Dow FILMTEC Model) that removes the bulk of contaminants. It even blocks bacteria and viruses.

The 4th and final stage features a coconut shell granular activated carbon filter that removes any residual tastes.

The unit operates under 40 – 80 psi to produce 90 gallons of pure water daily. Get a booster pump for optimal performance if your inlet water pressure is below 40 psi.

At 14 x 6 x 6.5 inches and 7 pounds, the APEC RO-CTOP is compact and lightweight enough for easy packing and transport. It is ideal for condominiums, apartments, RVs, or college dorms.

The system is designed with easy DIY installation and maintenance in mind. It also features the John Guest quick-connect fittings that allow quick filter changes.

The included faucet adapters connect to most standard faucets with little effort.


  • Filters 90 gallons of pure water daily
  • Has super high capacity filters
  • Portable, convenient, and easy to use
  • Hooks up with most standard faucets
  • Compact hence space-saving
  • Easy to install
  • Backed by a 1-year limited manufacturer warranty


  • Compatible with standard faucets only
  • Slow flow rate

4. Best Alkaline Remineralization and UV Ultraviolet: iSpring RCC7AK-UV 7 Stage Under Sink RO System

The iSpring RCC7AK-UV is an under-sink RO system that removes up to 99% of over 1,000 contaminants. It is NSF/ANSI certified and made from quality components to ensure reliability and low maintenance for years to come.

Featuring some of the most durable filters in the industry, the RCC7AK-UV filters water in 7 stages. Each stage is designed to eliminate contaminants and progressively improve your water’s quality.

3 pre-filters; PP sediment filter, carbon KDF(GAC) filter, and the carbon block(CTO) filter, remove large particles like sand and rust. They also eliminate chlorine and chloramines.

It has a transparent 1st stage housing that enables you to monitor the filters easily.

The RO membrane, which is the system’s heart, eliminates contaminants down to 0.0001 microns. A fine GAC filter polishes the water before it’s delivered to your faucet, while a remineralizing filter restores essential minerals to the water.

The system also has an advanced 11 watts UV stage that makes it suitable for tap water, well water, and other unreliable sources like lakes and streams.

Its UV lamp destroys and kills the DNA of all microorganisms making the water pure and healthy for consumption.

The RCC7AK-UV produces 75 gallons of water per day, has a filtered to waste water ratio of 1:3, is leak-free, easy to install, and measures 15 x 8 x 18 inches.


  • Has a remineralizing filter and a UV filter
  • Is made from high-quality materials
  • Has a transparent 1st stage housing
  • Deals with all kinds of water
  • NSF/ANSI 58 certified
  • Offers superior filtration performance
  • Has a lead-free brushed nickel faucet


  • Not easy to install

5. Deepuro WS6A 600 GPD Tankless RO System

If looking for an RO system that produces great-tasting water, try the Deepuro 600 GPD. This 5-stage tankless under sink unit produces healthy water free from heavy metals like mercury, lead, arsenic, and radium, among others.

With filter accuracy of 0.0001 microns, you’ll get the cleanest, odorless water in the comfort of your home.

The WS6A offers a fast flow rate of 600 gallons per day and fills a cup with pure water in 8 seconds. It’s on the cutting-edge of resources-saving, seeing that you’ll pay less monthly bills.

For easy operation, the system features a very sensitive touch panel. It has a real-time reminder and a filter life indicator that shows the status of the PPO, RO, and CTO filters.

The purified water system features premium food-grade materials with some parts strictly imported and certified by European conformity.

The tankless design and small footprint of the unit make it space-saving and ideal for households with tiny kitchen spaces. The design also effectively reduces secondary pollution, ensuring you get clean, pure, and healthy water.

An automatic flushing function reduces secondary pollution as well.

Installation of the system is a breeze thanks to the instruction manual, installation videos, and the fact that the package comes with all accessories you need.

The WS6A measures 15.7 x 6.4 x 12.7 inches, weighs 21 pounds, is CE certified, and features a 1:1 low drain ratio.


  • Produces 600 gallons of pure water daily
  • Has a super low drain ratio of 1:1
  • Features a super sensitive touch panel
  • Is CE certified
  • Made from food-grade materials
  • Comes in a tankless space-saving design
  • Comes with all accessories for easy DIY installation
  • Automatic flushing reduces secondary pollution


  • Noticeable noise from the pump


Now that reverse osmosis systems are varied and complex, you must think carefully about what you want for your home.

The best reverse osmosis water purifier should provide you with clean, pure, and healthy drinking water at all times. The unit should be easy to install and maintain, waste less water, produce enough to meet your daily water needs, and meet your budget.

We believe that by going through our comprehensive review, you’ll be able to get a model that suits your home best. The pros and cons of each system should help you decide with ease.

Related Resources

When you buy something through our affiliate links, we earn a commission without you having to pay extra.