The 7 Best Reverse Osmosis Systems – [2021 Reviews]

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If you’re serious about your health and those who live in your home with you, then installing a reverse osmosis system will be one of the best things you can do.

Removing contaminants from unfiltered water, it is an effective method to ensure your water is as clean as possible.

However, each model is a bit different and processes and ease of use vary widely.

Luckily, we’ve done the hard work for you already, testing and researching to bring you the top reverse osmosis water systems on the market today. Let’s get started!

Best RO Water Purifier Systems

 iSpring Under Sink RO Water FilterFrizzlife RO Under Sink Water FilterHome Master RO Water Filter
Output:75 gallons per day600 gallons per day50 gallons per day
Installation:Under SinkUnder SinkUnder Sink
Tank Size:3.2 gallonsTankless3.0 gallons

Quick Answer: The 7 Best Rated Reverse Osmosis Systems

  1. iSpring RCC7AK  Under Sink Reverse Osmosis Filter System
  2. Frizzlife RO Reverse Osmosis Under Sink Water Filtration System
  3. Home Master TMAFC Artesian Undersink Reverse Osmosis Water Filter
  4. APEC Water Systems 5-Stage RO Water Filter System
  5. Waterdrop RO Reverse Osmosis Water Filtration System
  6. Express Water UV Reverse Osmosis Water Filtration System
  7. APEC Water Systems RO-90 Supreme Certified RO System

Our reviews to the top rated reverse osmosis systems with our comparison table and buyers guide will help you choose the right best reverse osmosis system for you.

Reverse Osmosis System Reviews

iSpring Under Sink Reverse Osmosis Water Filter at a Glance:

  • Stages: 6
  • Output Per Day: 75 gallons
  • Installation: Under Sink
  • Tank Size: 3.2 gallons

To start things off, we have the model often considered to be the best ro water purifier: the iSpring RCC7AK 6-Stage Under Sink Reverse Osmosis Filter System.

The high-capacity system is relatively easy to install under the sink so no one has to see it and no valuable space is taken up around the sink or countertop.

The 6-stage system is incredibly thorough for the price, made to restore the natural alkalinity and mineral balance of your drinking water.

Furthermore, it removes up to an impressive 99% of more than 1,000 harmful contaminants, including chlorine, fluoride, arsenic, and much more. However, it’s important to mention that it only removes up to 98% of lead.

Enjoy softer and tastier water, thanks to the Alkaline Remineralization feature to offer a more natural taste our bodies crave.

The European-style design is one of the more attractive selections we’ve seen, with transparent 1st-stage housing so you can see everything that’s going on.

On top of that, there are 3 durable pre-filters to get rid of bigger contaminants while protecting the membrane. The ultra-fine filter has the task of removing contaminants down to just 0.0001 microns!

If you’re not quite DIY-savvy, you’ll love how easy installation is. The package comes with all required parts and we found the instructions to be very thorough and easy to follow.

Frizzlife RO Reverse Osmosis Under Sink Water Filter at a Glance:

  • Stages: 4
  • Output Per Day: 600 gallons per day
  • Installation: Under Sink
  • Tank Size: n/a

At first glance, you can see that the Frizzlife Reverse Osmosis Filtration System has some slick engineering behind it. The tankless design is streamlined and perfect for smaller spaces – never taking up much room.

It’s also one of the best reverse osmosis systems if you need a high output of water, as it’s capable of producing a whopping 600 gallons per day!

Coming with the filters already inside and a lead-free drinking faucet, you’ll have everything you need to get started in the box.

Installation is also a breeze, so if it’s your first time installing something like this, you shouldn’t have any problems.

Using top-notch reverse osmosis membranes with 0.0001 micron filtration accuracy like our previous model, it is capable of removing up to 99.99% of over 1,000 harmful contaminants.

It’s practically impossible to get better than this, removing lead, heavy metals, TDS, and so much more. Moreover, a sediment filter works as a 2-in-1, offering 4 stages of filtration before you drink it.

Remineralization and alkalization balances the acidity, keeping the PH to 7.5 and under at all times  and adding natural minerals back in – both of which are very beneficial to human health.

As it’s so efficient, you can actually save your water up to 450% when compared to conventional systems.

Finally, the smart LED display shows real-time out TDS and the lifespan left on each filter so you can plan accordingly!

Home Master TMAFC Undersink Reverse Osmosis Water Filter at a Glance:

  • Stages: 7
  • Output Per Day: 50 gallons per day
  • Installation: Under Sink
  • Tank Size: n/a

Are you on the hunt for the best reverse osmosis water filter on a budget? If so, then you need to check out the Home Master TMAFC Artesian Undersink Osmosis Water Filter System now!

It may be great for those trying to save some cash, but it’s definitely not sparse when it comes to performance and reliability.

Restoring natural calcium and magnesium, it’s actually better for your health, and better tasting! Many of us struggle to drink enough water throughout the day, even though it’s crucial for a properly working body and mind.

This is an excellent solution, providing you with clean water on tap at all times.

Removing up to 98% of harmful chemicals, heavy metals, sediment, etc., it’s just a tiny bit less accurate than the others we’ve covered so far, but definitely still high-performing.

Using an impressive 7 different stages of filtration, you can rest assured it’s highly effective, with an incredibly fast flow rate.

The filter element and housing are an all-in-one configuration which makes annual changes quick and easy, even if you’re not necessarily a “handy” person.

Not only that, but the filters are very durable and require a switch once every year or every 2000 gallons with no need for wrenches.

APEC Water Systems ROES-50 RO Water Filter System at a Glance:

  • Stages: 5
  • Output Per Day: 50 gallons per day
  • Installation: Under Sink
  • Tank Size: n/a

Streamlined and effective, we have the APEC Water Systems ROES-50 Essence Series. The American-made product is one of the most reliable out there, guaranteeing safe water and your health.

Removing up to 99% of harmful contaminants, including bacteria and viruses, you’ll probably notice you’re sick less often and overall feel more energetic and active.

APEC is actually the best-rated water filter brand in the US, which makes sense when they’ve been perfecting as the system is WQA-certified, you don’t have to worry about quality.

Every component of the system is high-quality and safe; solely with the purpose of treating tap and well water.

Coming with a lead-free faucet along with FDA-certified, food-grade tubing, you have everything you need to get started. Ridding water of up to 99% of contaminants, it’s not only extremely safe to drink, but will also get rid of any foul odors.

Easy installation will make the entire process of setting up shorter, so you can enjoy even tastier coffee, ice cubes, and water, sooner.

Leak-free fittings make maintenance very rare, so if you’re looking for one of the most user-friendly systems, this could be the best home reverse osmosis system for you.

Waterdrop RO Water Filtration System at a Glance:

  • Stages: 5
  • Output Per Day: 400 gallons per day
  • Installation: Under Sink
  • Tank Size: n/a

If you value cutting-edge technology and aren’t worried about a tight budget, take a look at the Waterdrop RO Reverse Osmosis Water Filtration System.

This is one of the most luxurious, high-tech systems on the market today and is quite possibly the easiest to use. If you want a user-friendly product, it’s hard to beat this one!

The tankless design makes for a very compact, sleek footprint and comes in either Black or White – depending on your tastes. We personally liked the black as not only was it more unique, but really has a modern feel to it.

Coming with the system are two filters, so you won’t have to buy replacements for quite a while and can get started right away with clean, delicious water!

Filter composition technology works to filter out impurities while saving over 70% extra under-sink space than your typical alternative.

Moreover, the advanced technology features airtight housing and water circuits so you never have to worry about leaks and can replace filters quicker and easier. Installation was the easiest we’ve experienced.

Capable of producing up to 400 gallons per day, it can save over 60% water as well, making your water bills more manageable.

While it does work well for homes, due to this high output, it’s also great for use in offices, restaurants, cafes, and more.

Composite integrated filters come with a sediment PP membrane along with an activated carbon block to remove impurities like never before. Getting rid of sediment, rust, chloride, and more, you’ll wonder why you didn’t jump on this deal sooner.

Express Water UV Reverse Osmosis Water Filter at a Glance:

  • Stages: 11
  • Output Per Day: 100 gallons per day
  • Installation: Under Sink
  • Tank Size: 3.2 gallons

Heading towards the end of our list, we have the Express Water UV Reverse Osmosis Water Filtration System. The 11-stage filter is extremely thorough, though as you could imagine, is also a bit elaborate.

If you’re looking for the best countertop reverse osmosis system, this isn’t the one. However, it’s one of the best under-sink versions and will allow you to easily hide the entire system while enjoying clean and tasty water.

As there are so many stages of filtration, it’s no surprise that it’s capable of removing up to 99.99% of lead, chlorine, fluoride, nitrates, calcium, and more.

Along with that, is the robust UV sterilization system which takes things a step further and eliminates coliform, E. Coli, viruses, bacteria, microorganisms, etc. from your drinking water.

However, it doesn’t strip the water completely. The Alkaline Filtration System adds calcium, potassium, magnesium, and more to provide your body with the minerals it needs to function at its highest level.

Installation was very straightforward, making it almost enjoyable to set up. With an emergency leak detector, it automatically turns off water flow if it detects unwanted moisture.

While it’s not as sleek or compact as some others on our guide, this is a wonderfully effective, efficient system.

APEC Water Systems RO-90 Supreme Certified RO System at a Glance:

  • Stages: 5
  • Output Per Day: 90 gallons per day
  • Installation: Under Sink
  • Tank Size: n/a

We couldn’t end our guide without mentioning the APEC Water Systems RO-90 Ultimate Series Reverse Osmosis Drinking Water Filter System.

This high-quality model is great for home use, with the ability to produce up to 90 gallons of clean drinking water per day. Made and engineered in the US, it’s incredibly durable, reliable, and effective.

Just like the other APEC model a bit back, the RO-90 Ultimate comes tested and certified by WQA to remove up to 99% of contaminants like chlorine, fluoride, arsenic, etc., along with foul tastes and odors.

The large-capacity filters offer twice the removal of contaminants as competitor models at this size, resulting in fewer filter changes and less maintenance.

Included with the system is a 100% lead-free designer faucet, along with FDA-certified, food-grade tubing so you can rest assured each component of the system is safe for you and your family’s consumption.

Leak-free seals only add to the ease of use, and the design is clearly made to identify and replace filters easily.  As it purifies so quickly, you’ll also receive your water up to 2x quicker, so if you’re really thirsty or need it right away, no one has to wait around.

Reverse Osmosis Systems Comparison Table

RO Water Filters StagesOutput Per DayInstallationTank SizeRating
iSpring Under Sink RO Water Filter675 gallonsUnder Sink3.2 gallons4.7 / 5.0
Frizzlife RO Under Sink Water Filter4600 gallonsUnder SinkNo Tank4.7 / 5.0
Home Master TMAFC RO Water Filter750 gallonsUnder Sink3.0 gallons4.8 / 5.0
APEC Systems RO Water Filter550 gallonsUnder Sink3.0 gallons4.8 / 5.0
Waterdrop RO Water Filtration5400 gallonsUnder SinkNo Tank4.7 / 5.0
Express Water UV RO Water Filtration11100 gallonsUnder Sink3.2 gallons4.6 / 5.0
APEC Water Systems RO-90 RO System590 gallonsUnder Sink3.2 gallons4.7 / 5.0

How to Choose the Best Reverse Osmosis Filtration System – Buying Guide

Best Reverse Osmosis Filtration System
Photo Courtesy of Home Master

Now that you’ve had the chance to read all about some good reverse osmosis systems, do you know which you’ll be using to clean your drinking water? If you’re still undecided, there’s no need to worry.

We know it can be confusing as there are so many great selections, and if you’ve never used one before you may not know what to look for. That’s why we’ve decided to take it upon ourselves to write up this handy buying guide, below.

The guide will lead you through each step of the selection process so that by the time you’re done reading, there will be no doubt which is the best RO water filter for you.

Check Filtration Specifics

As you may have already noticed, each water filter removes different substances. While almost all of the best models on the market currently remove chlorine, not all remove lead, which is something many people need removed from their water.

The best way to figure this out instead of playing the guessing game and hope it works out, is to test your water. After you know what’s in it, you can then start to narrow down your options and choose a filter which specifically removes what you have in it.


When it comes to anything that your water passes through, it needs to be safe and of the utmost level of quality. Any easy way to ensure you’re safe in this regard, is by choosing a model certified by a reputable entity.

Many meet NSF/ANSI standards (NSF International and the American National Standards Institute) for certain contaminants, like chlorine and lead. However, there are others which check the taste and odor reduction and a trained panel of professional tasters will rate just how skilled the filters are at removing said flavors and odors.

The water they test the filtered water against is pure spring water, so if it scores well you know it will taste good.

Filtration Quality

First, you’ll want to check how many filter stages come with the design. More doesn’t always equal better, though there are oftentimes correlations which would suggest this.

Try to get a model which removes 99% to 99.99% of contaminants if you can. There are some more affordable versions which remove around 98% and if you’re really on a budget that is still a nice option as well.

The quality of filters is just as important. For example, coconut carbon filters can get filtration down to incredibly small amounts, whereas lower-grade alternatives may use coal carbon which can be around half as precise.


Think about the available space and location you have for your reverse osmosis system. Those on our guide are all under-sink models so you need enough room under there to accommodate the model of your choosing.

Some require quite a bit of space but if you really don’t have a lot of extra room, we recommend opting for tankless models which are streamlined and have a compact footprint.

Water Pressure

Your filtration system is not going to operate correctly if the water pressure is less than 40PSI. Sometimes you can boost the pressure of your waterline with a booster pump, though this isn’t always the case.

Some RO systems come with a pump, and others do not, so if your water pressure will not rise without one, it’s probably not ideal for your home.


There are some systems that are so effective that they also remove some of the healthy minerals from the water. Water is amazing regardless, but for maximum benefits you do want the minerals we’re speaking about. Units which come with alkaline remineralizers will put these back into the water so you’re not missing out on the good stuff.


Ease of maintenance is an important aspect to take into consideration. After all, you don’t want to be dreading having to replace the water filter, do you? While reverse osmosis systems do have multiple filters and components involved, there are some which were designed to make the process as streamlined and user-friendly as possible.

There are also certain options which require more frequent changes than others, which will also increase your costs so don’t skip out on that info.


How much are you willing to spend on one of the top RO water filtration systems? We highly recommend you figure this number out for yourself before you get started shopping around, as it can be all too easy to get excited and spend more than you’d originally intended on doing.

However, if you can opt for a more expensive model, it’s oftentimes worth it and can ultimately save you cash. More expensive models (oftentimes) will last longer as they feature higher quality components and require less filter changes.

FAQs About Reverse Osmosis Systems

Q: What is a reverse osmosis system?

A: It’s a system which works to purify tap or well water, using a semi-permeable membrane to get rid of impurities such as lead, bacteria, viruses, and more. They remove both large and incredibly small particles from the water, and often add essential minerals back into it so your body benefits most.

Q: How does reverse osmosis work?

A: It removes sediment and chlorine from your drinking water by using a prefilter, before it then pushes it through a partially permeable membrane in order to completely remove dissolved solids. After this stage, it leaves the membrane and passes through a postfilter to give an extra layer of filtration and “polish” the water before it reaches the faucet and your glass. Of course, there are some models which feature extra stages, depending on the design.

Q: What isn’t removed by reverse osmosis?

A: While they’re known for removing quite a large array of contaminants, it doesn’t cover everything. Certain pesticides, solvents, along with volatile organic chemicals and certain metals will not be removed.

Q: Is reverse osmosis water better for you.

A: Yes, it is! It removes over 1,000 harmful substances in drinking water, and can also add back in essential minerals so your body is healthier, and your water tastes better.

Q: Is reverse osmosis water safe to drink?

A: Absolutely! It’s bottled water quality, if not better!

Tips For Choosing Reverse Osmosis Systems

#1: Make sure the output is right for you and your needs.

You may notice that the output varies widely between models. Some are just 50 gallons a day while others are well over 500! You most likely will want something 500 or less for homes, though if you’re using them for cafes, offices, etc. then the more, the better.

#2: If you’re not very DIY-savvy then pick a more technologically advanced model.

Some can be more difficult to tell when the filters need to be changed, along with maintenance. If you want to minimize worry and hassle, then opt for a more high-tech selection.

#3: When paying attention to costs, make sure to factor in filter changes.

It’s important to look over how often you’ll need to change your filter with the model you have your eye on. Of course, this is just a general guideline, as all of our sources of water vary a bit, along with our water consumption. The more often you have to change your filter, the more expensive it’s going to be for you.


Now that you know just about everything you could ever want to about good RO water purifiers, which one will you be using in your home?

If you’re still undecided, there’s no need to be concerned. No matter which model you choose, you can rest assured that all of the ones on our guide are some of the best around today.

What’s most important, is that you select the system that works best with your water source, your lifestyle, usage, and available space. We hope that our guide has helped you to do just that. Thanks for tuning in and stay hydrated!


The iSpring RCC7AK is our Editor's Choice for the best reverse osmosis water filters with its combination of performance, quality and features.

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Shayanne Weeks

Shayanne is a freelance writer and personal trainer based in LA, California. Describing herself as a nomad, she has lived in Boise, Idaho and Seattle, Washington as well as Guadalajara, Mexico. As an extremely active person, she loves to train people, teach yoga, and ski. She enjoys sharing her love for teaching others through her “how to” fitness guides and workout equipment reviews. Shayanne is addicted to surfing and yoga and practices both everyday.
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