The Best Reverse Osmosis Systems for Water Filtration at Home

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Make delicious purified drinking water under your sink with a reverse osmosis water filtration system.

To reduce contaminants from drinking water or improve the taste and smell of tap water, water filters in refrigerators and pitchers can do the job. To take water purification to the next level, , however, consider a reverse osmosis water filtration system. 

A reverse osmosis (RO) water system integrates with the plumbing under your kitchen sink to force water through a semipermeable membrane and a series of filters, removing sediment and contaminants, providing dozens of gallons of purified water each day. 

This article will explore factors you will want to consider when shopping for the best reverse osmosis system and suggests some of our top options. To ensure that our products perform as promised, we also conducted hands-on testing with a few select models.

1. BEST OVERALL: Apec Water ROES-PH75 Essence Reverse Osmosis System
2. RUNNER-UP: Bluevua RO100ROPOT Countertop Reverse Osmosis System
3. BEST BANG FOR THE BUCK: Express Water RO5DX Reverse Osmosis System
4. BEST UNDER-SINK: iSpring RCC7AK 6-Stage Reverse Osmosis System
5. BEST TANKLESS: Waterdrop G2 Tankless Reverse Osmosis System
6. BEST COUNTERTOP: AquaTru Classic Countertop RO Water Purifier
7. BEST FOR APARTMENTS: RKIN AlcaPure Zero Installation Purifier Water Filter
8. BEST FOR DRINKING WATER: Express Water Alkaline & Ultraviolet RO System
9. BEST FOR WELL WATER: iSpring RCC1UP-AK 7-Stage UnderSink RO System
10. BEST NSF-CERTIFIED: Home Master TMAFC Full Contact Reverse Osmosis System
11. BEST RO ICE-MAKER KIT: Apec Water Icemaker Kit for Apec RO System

How We Chose the Best Reverse Osmosis Systems

We researched and tested some of the most sought-after reverse osmosis water filter systems in their respective categories and discovered that the best models are determined by their tank size, water output, included filtration stages, filtration type, and other special features included by select brands.

Whether you are looking for a countertop reverse osmosis water filter for a few people or need a large under-sink unit that can support an entire household, the models listed below range from 1- to 400-gallon water outputs per day with their tankless or tanked constructions. Those options that do have tanks can hold ½ gallon to over 4 gallons of water on hand, while tankless options can produce unlimited clear water on demand. 

As for the filtration processes, we featured options that include 4 to 11 filtration stages, some of which remove over 99 percent of contaminants, odors, and tastes with alkaline, ultraviolet (UV), and/or deionization systems. We also made sure that our top picks came with National Sanitation Foundation (NSF) certifications for reliability and peace of mind. Some picks are capable of adding healthy minerals and vitamins as they filter, including magnesium and calcium. For added ease of use and effectiveness, select options include LED displays and easy-to-change filters. 

Our Top Picks

The products below represent the top standard, countertop, and tankless reverse osmosis water treatment systems from the industry’s leading manufacturers. These units feature high output and efficient wastewater-to-purified-water ratios, our own insights from hands-on testing, and thoroughly vetted pros and cons. 

Best Overall

Apec Water ROES-PH75 Essence Reverse Osmosis System

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Product Specs 

• Tank size: 4 gallons 
• Water output: 75 gallons per day 
• Number of filtration stages: 6

Pros

• High-flow system designed to provide fresh drinking water for busy homes
• Filters last for up to a year removing 99 percent of contaminants and adding beneficial minerals
• Straightforward to install; includes faucet, and is Water Quality Association Gold Seal certified

Cons

• Although complaints are rare, some users feel the filters need changing more often than expected

With easy installation and high-capacity filters that last much longer than those of other systems, Apec’s RO system is an excellent option for purifying your home’s water. Whereas filters on other systems may last for only a few months, the filters on this six-stage system will last for a full year before needing replacement. 

The system’s six stages remove contaminants and 99 percent of bacteria while also adding essential healthy minerals and calcium. This system produces up to 75 gallons of treated water each day. A flow restrictor and automatic shut-off valve keep wastewater production to 3 gallons for every 1 gallon of treated water. This system does use a 15-inch long by 11-inch wide 4-gallon tank, so make sure you have plenty of space under your kitchen sink. 

Get the Apec Water ROES-PH75 reverse osmosis system at Amazon, Lowe’s, The Home Depot or Wayfair.

Runner-Up

Bluevua RO100ROPOT Countertop Reverse Osmosis System

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Product Specs 

• Tank size: Pitcher holds 1,700 milliliters (0.45 gallon)
• Water output: 100 gallons per day
• Number of filtration stages: 4

Pros

• High-quality, compact, and portable RO system ideal for home, office, or RV use
• 4-stage filter removes contaminants and reduces TDS for improved water taste
• LED display provides precise water-quality information and filter change alerts

Cons

• Competitively priced for a countertop model but still expensive compared to many under-sink units

The Bluevua countertop RO system has one major advantage over under-sink models: There is zero installation required. Not only is this convenient, but it’s also ideal for those who want the advantages of reverse osmosis in the office or their RV. It isn’t necessary to buy several units; this model can be unplugged and moved.

The four-stage filtration removes harmful contaminants and reduces total dissolved solids (TDS) to improve the taste of the water. Filters last anywhere from 12 to 24 months and take just a couple of seconds each to change. Unusually, the pitcher is high-quality glass rather than plastic.

Output is impressive at up to 100 gallons per day capacity, though the pitcher only holds 0.45 gallons, so regular refilling would be required in busy environments. 

Get the Bluevua reverse osmosis system at Amazon.

Best Bang for the Buck

Express Water RO5DX Reverse Osmosis System

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Product Specs 

• Tank size: 4 gallons 
• Water output: 50 gallons of water per day 
• Number of filtration stages: 5

Pros

• An efficient 5-stage system that removes dangerous contaminants at a budget-friendly price
• The easy-to-understand design allows for money-saving DIY installation
• Certified by specialist food-safety organization National Sanitation Foundation (NSF) to American National Standards Institute’s (ANSI) 58 requirements

Cons

• While most units appear trouble-free, a few owners have reported leaks

With its low price tag and 50-gallons-per-day capacity, this RO system from Express Water is an excellent option for shoppers on a budget. This five-stage system includes alkaline, UV, and deionization treatment and removes dangerous contaminants such as lead, arsenic, and chromium. A fifth stage removes taste or odor.  

It’s also customizable, with the ability to add additional filtration attachments. Other features include a leak-detection system. The Express Water RO system offers a simplified installation process designed specifically for DIYers. Express Water also has on-demand support from experts who are ready to walk you through the installation process. 

Get the Express Water RO5DX reverse osmosis system at Amazon, Lowe’s, The Home Depot or Walmart.

Best Under-Sink

iSpring RCC7AK 6-Stage Reverse Osmosis System

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Product Specs 

• Tank size: 3.2 gallons 
• Water output: 75 gallons per day 
• Number of filtration stages: 6

Pros

• An affordable system with an alkaline remineralized filter for healthier, better-tasting water
• Removes lead, arsenic, asbestos, and other contaminants to NSF/ANSI safety standards
• Includes a solid-brass nickel-plated faucet and push-fit connectors for rapid installation

Cons

• Filtration always reduces pressure, but some owners feel this model is more restrictive than necessary

Capacity is often an issue when it comes to under-sink RO systems; a typical customer complaint is that their RO system just doesn’t produce enough water. That’s not the case with this system, which produces up to 75 gallons of purified water each day—more than enough for most households. 

And while many RO filter systems stop at five stages, iSpring adds a sixth stage, which includes a remineralization filter that adds healthy minerals removed in the previous stages back into the water. In addition to its capacity and filtration system, owners also love the modern brushed-nickel look for the faucet, which adds both elegance and purified water to a kitchen. 

Get the iSpring RCC7AK reverse osmosis system at Amazon, Lowe’s, The Home Depot or Walmart.

Best Tankless

Waterdrop G2 Tankless Reverse Osmosis System

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Product Specs 

• Tank size: Tankless 
• Water output: 400 gallons per day 
• Number of filtration stages: 7

Pros

• Compact tankless system requires less space than typical alternatives and is easy to install
• High filtration combined with very high flow rate and low wastewater ratio
• Requires just 2 filters that are quick and easy to remove and replace 
• Excellent longevity; included filters last for either 12 or 24 months

Cons

• Both the main unit and replacement filters come with relatively high price tags 

Two of the biggest complaints about RO systems are the massive tank that takes up a lot of the space under the kitchen sink and the limitations in purified water capacity. Reclaim that space and multiply your purified water output with this tankless RO system from Waterdrop. This system takes up 70 percent less cabinet real estate while boosting your purified water to a whopping 400 gallons per day. 

The Waterdrop also produces faster water flow, filling a cup with filtered water much faster than a standard system. The system includes compact filters that remove multiple contaminants, resulting in a unit that takes up less space. The filter design also means the filters will last much longer than the standard 6 months. When it is time to replace them, removing the filters is an easy twist-and-pull process. 

Get the Waterdrop reverse osmosis system at Amazon, Walmart or Waterdrop.

Best Countertop

AquaTru Classic Countertop RO Water Purifier

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Product Specs 

• Tank size: 1 gallon  
• Water output: 1 gallon every 12 to 15 minutes 
• Number of filtration stages: 4

Pros

• Doesn’t take up any valuable space under the sink and requires no DIY installation
• Patented 4-stage purification technology has been tested to NSF certification standards
• Smart connectivity option with app to monitor water consumption, filter status, etc. (extra cost)

Cons

• It’s expensive and needs regular refilling rather than providing constant water at the faucet 

The AquaTru countertop water filtration system allows for filtered water without taking up space under the cabinet and eliminates the need for DIY installation. 

This self-contained system is ready to go out of the box. The four-stage system removes 83 contaminants, including lead, chromium, copper, radium, and chlorine. Its quick-installation twist-and-seal filters last up to 2 years. Fill the gallon tank and wait 12 to 15 minutes for the system to purify the water. And at just 14 inches wide, this system won’t take up much real estate on your counter either. 

Get the AquaTru reverse osmosis system at Amazon, The Home Depot, or AquaTru.

Best For Apartments

RKIN AlcaPure Zero Installation Purifier Water Filter

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Product Specs 

• Tank size: ½ gallon 
• Water output: 75 gallons per day 
• Number of filtration