10 Best Reverse Osmosis System Reviews We've Tested

Certified to NSF/ANSI 58, 6-Stage Alkaline Remineralization Layered Filtration - Exclusively designed to restore the natural alkalinity and mineral balance of water; this reliable and ultra-safe Reverse Osmosis (RO) water filtration system converts your water into clean, pure and healthy drinking water by removing up to 99% of over 1,000 harmful contaminants like chlorine, fluoride, lead (removes up to 98%), arsenic, asbestos, calcium, sodium and more.

GREAT-TASTING MINERAL WATER - A standard 5 stage RO system produces slightly acidic water with a pH of 7. 0 or below because the RO membrane removes not only harmful pollutants but also a few helpful minerals. The iSpring RCC7AK Reverse Osmosis water filter includes an additional 6th stage - an Alkaline Remineralization filter which restores healthy minerals and produces a balanced alkalinity, which gives your water a more natural taste than regular 5 stage RO water filter.

LOW MAINTENANCE - Transparent 1st stage housing for easy visual inspection. Three extra long life pre-filters to remove large contaminants and protect RO membrane. Ultra fine (RO) filter to remove contaminants down to 0. 0001 microns; fine GAC filter to provide final polishing to the purified water and (AK) filter to finally restore just the right proportion of healthy minerals and a natural alkaline balance. The end result is great-tasting bottled-water quality.

EASY TO INSTALL & NO LEAKS - The water purifier is designed for do-it-yourself installation and all necessary parts for installation are included. Backed by clear installation manual, instructional videos, and access to life-time technical support. The entire alkaline water filter fits nicely under a kitchen sink. For leak-free installation, simply push tubing ½ inch deep into quick-fitting connectors and lock; no threading pipes needed.

100% SATISFIED CUSTOMERS - RCC7AK from America’s favorite brand of under sink water filter is the highly rated reverse osmosis systems. Comes with 1-year limited manufacturer warranty upon registration and lifetime personalized support from GA, USA, combined with premium quality components, this water filter is to deliver endless bottled quality drinking water right in your home for many years to come, eliminating plastic waste.

Supreme quality - designed, engineered, and assembled in USA to guarantee water safety & your health. WQA certified to provide unlimited clean, refreshing crisp tasting water superior to bottled water

Premium long-lasting filters remove up to 99% of contaminants such as chlorine, taste, odor, VOCs, as well as toxic fluoride, arsenic, lead, nitrates, heavy metals and 1000+ contaminants. Max Total Dissolved Solids - 2000 ppm. Feed Water Pressure 40-85 psi

America's No.1 rated water filter brand with 20 years of success guaranteeing trouble free, noise-free system for long lasting, dependable, pure drinking water. 2 year extended manufacturer warranty is available upon registration

System comes with 100% lead-free designer faucet, plus certified JG food grade tubing and parts to provide safe, contamination-free pure water. Pipe Size: 1/4 inches.

High quality leak-free quick connect fittings require no extra lock clips to seal leak - not relying on water leak detector to protect your home like other brands. Comes with all parts and industry's best instructions and videos for an easy DIY experience.

Reverse Osmosis Water Filter: Experience what water should taste like with the Express Water reverse osmosis water filtration system reducing up to 99.99% of Lead, Chlorine, Fluoride, Nitrates, Calcium, Arsenic, and more.

Water Purification System: Drink the healthiest water on Earth. All our water filters are specially engineered to work together, producing the safest and best tasting water you’ll ever drink

Under Sink Water Filter: Don’t waste money on professional installation. Express Water’s quick and easy-to-understand design means you can install and understand everything about your new water filtration system

Under Sink Water Filter System: No need to mess with refilling or activating your water filter, Express Water’s water filtration systems automatically fill your water tank with high quality drinking water

Leak Detection: Each under sink water filter includes an emergency leak stop detector that shuts off water flow when it detects unwelcomed moisture

Customizable RO Water Filter System: Express Water home water filtration systems are fully upgradable and customizable with quick connecting fittings. Try additional filtration attachments including UV Water Filter, Alkaline Water Filter, Deionization Water Filter, and more

On Demand Support: Support from experts who can answer any of your questions about your new water filter

Help Has Arrived - Support from experts who can answer any of your questions about your home’s water

Love your water - Environmentally friendly coconut carbon filters give unequalled quality and a clear natural taste

Enjoy unlimited ultra-fresh, clean, great tasting water right at home. Save money, time and hassle of buying costly, bottled water

Designed, engineered and assembled in USA, RO-90 is the most durable system in the industry to guarantee water safety & your health

Tested and certified by WQA to remove up to 99% of contaminants including arsenic, chlorine, lead, fluoride, heavy metals, virus and 1000+ contaminants

Large super capacity filters deliver 2X contaminant removing capacity for fewer filter change outs compared to smaller all-in-one filters that clog up quickly

Comes with 100% lead-free designer faucet, plus JG Food grade tubing to provide safe, contamination-free pure water. The original, top-notch JG Quick Connect fittings for easy and secure leak-seal

Simple and organized, RO-90 is designed to make identifying and replacing filters intuitive and easy

Provides you the ultimate satisfaction and peace of mind with our lifetime support and 2 year manufacturer warranty with registration

Three filters are included in the package. Search "Waterdrop WD-G3-W Filter" for replacement filters

[NSF Certified performance]: The system is certified against NSF 58 for TDS reduction. Using reverse osmosis filtration technology with a filtration accuracy of 0. 0001μm, the system can effectively remove most contaminants including fluoride, TDS, limescale, and heavy metals in your tap water. System is also NSF 372 certified for lead free material

[Smart, easy-to-install design]: Waterdrop RO water filtration system is an innovative, all-in-one intelligent water purification system. In just a few minutes, Waterdrop RO system can be installed completely, and in just three seconds, the filter can be changed with one single turn. Installation is that easy

[The first composite filter element]: It is the first smart RO system with composite filters and tankless design in the U. S. market. The three filters provide seven stages of filtration. The pre-sediment and carbon block filter is a 3-in-1 filter that functions as that of three filters combined. The Reverse Osmosis membrane filter adopts an innovative design, and the efficiency of the filter equals more than three stages of filtration. Additionally, the activated carbon block filter uses high-precision activated carbon granules made from natural coconut shell, which will also improve the water taste

[No-tank design]: Use new composite filter element technology to more efficiently filter out harmful substances. The tankless design helps you avoid secondary pollution and enjoy more storage space in your kitchen

[No waiting for clean water]: Thanks to its internal pump, the RO system offers faster water flow (400 gallons per day). The system can filter a cup of water in about 12 seconds. It can produce pure water quickly, thereby meeting the needs of your whole family and even small companies

[1: 1 low drain ratio]: Compared to traditional RO systems, Waterdrop Reverse Osmosis Water Filtration System saves water waste by 300%. Save money on your water bills while running the RO system

[Special notice]: You must fully turn on the faucet and flush the RO system for 30 minutes after installation. The light on the faucet will flash blue during flushing, but once completed, the blue light will stop flashing. The total water capacity will be about 8. 5 gallons and the water will be undrinkable during flushing. To save water, be creative and collect the water for other purposes, such as watering plants

A better RO system | Home Master Artesian Full Contact’s innovative design solves most common problems associated with canister and tankless RO systems

Increased Luxury & Performance | Loaded model includes brushed nickel RO Faucet, Fridge Connection Kit, and Dow Filmtec High Performance High Hardness RO Membrane (0.0001 micron, 75GPD)

Mineral Water on Tap | Patented remineralization system adds calcium and magnesium twice during the purification process for reduced storage tank degradation and great tasting, highly pure Mineral Water on Tap

NSF Certified Components | meets or exceeds NSF standards for material safety and performance. NSF listed company. Made in USA

Faster Flow Rate | Included Fast Flo RO! Kit has larger fittings and tubing to provide twice the flow of traditional RO systems

Reduced Water Waste & TDS Creep | Built in non-electric permeate pump reduces TDS creep and water waste up to 80%, increases water production up to 50%, for about a 1:1 waste ratio. No electricity required

Modular design | Easy to upgrade and service. Filter changes once per year or 2000 gallons with no wrenches required

In the box: Assembled purification unit w/ filters & DOW membrane (0.0001 micron, 75 gpd), Tank, 3/8 in adapter w/ shut off, chrome faucet, drain saddle. DIMENSIONS: Purification cluster - 16” high x 15” wide x 5” deep, Tank - 15” high x 11” diameter

Catalytic Carbon | Home Master catalytic carbon outperforms ordinary activated carbon in removing stubborn chloramines, chlorine and other chemicals

Supreme quality - designed, engineered and assembled in USA to guarantee water safety & your health.

This 75 GPD 6-stage system ROES-PH75 is guaranteed to remove up to 99% of contaminants such as chlorine, taste, odor, VOCs, as well as toxic fluoride, arsenic, lead, nitrates, heavy metals and 1000+ contaminants. Max Total Dissolved Solids - 2000 ppm. Feed Water Pressure 40-85 psi

US made cartridge uses food-grade calcium from trusted source for safe, proven water pH enhancement. Enjoy ultra-pure drinking water with added calcium minerals for improved ALKALINITY and great taste.

WQA certified system. Premium long lasting filters used to treat tap/well water. Provide unlimited clean drinking water.

America's No.1 rated water filter brand with 20 years of success guaranteeing trouble free, noise-free system for long lasting, dependable, pure drinking water.

2 year extended manufacturer warranty with registration. System comes with all parts and industry's best instructions and videos for an easy DIY experience.

System comes with 100% lead-free designer faucet, plus JG Food grade tubing and parts to provide safe, contamination-free pure water. High quality leak-free quick connect fittings require no extra lock clips to seal leak, and does not rely on water leak detector to protect your home like other brands.

This countertop RO system filters up to 4 gallons of water an hour; for a higher production rate, consider our undersink RO systems; the countertop RO only works with faucets that use a threaded removable aerator; not compatible with sprayer faucets

Easy to Install Countertop Filter: Express Water’s countertop reverse osmosis systems only requires minutes to install and is designed for an easy 4-point installation that fits most standard faucet types

Low Maintenance Water Filter: Once set-up, the reverse osmosis countertop filter requires little maintenance. Quick-connect and replaceable water filter cartridges make it easy to keep your water fresh

4 Stage Water Filters: Express Water 4 Stage Countertop Water Filter Systems include Sediment filter, Granular Carbon filter, Reverser Osmosis Membrane, and Post Activated Carbon filter to remove 99.99% of major contaminants in your drinking water

Countertop RO Water Filter System: Enjoy fresh and clean drinking water from the easy install Express Water countertop water filters. On Demand Support: Support from top rated customer service team who can answer any of your questions about your Express Water countertop filtration system. Backed by 1-Year limited warranty

EASY INSTALLATION: Simply follow the instructions manual and connect fittings and colored tubings into your sink plumbing to quickly set up and install the reverse osmosis unit. The ease of installing this water purifier will help save you money on hiring a plumber!

TANKLESS/WATER SAVING: Tankless design saves space and prevents the potential breeding of harmful contaminants in tanks. Multi-stage water filter is 600% more efficient than most RO systems with a pure to drain ratio of 2:1.

600GDP HIGH FLOW: Bluevua is a drinking water specialist who understands the value of a fast fill-up. Highly efficient pure water flow of 600GDP allows you to fill a cup of water in just 8 seconds!

SERVICE LIFE & MONITOR: Filters have a long service life of between 12-24 months to provide up to 2 years of clean drinking water before replacement is necessary. Smart filter life monitor also lets you know when filter replacement will be needed.

FULLY EQUIPPED: Water filter under sink system comes with everything you need including a premium stainless steel drinking water faucet, leakage protector, drain saddle, feed water adapter, and an adjustable wrench. You'll install your reverse osmosis drinking fountain at home in no time at all.

5-STAGE FILTRATION: Micron Melt-blown Polypropylene Sediment removes large and fine particles such as sand, dirt, silt, and rust particles.

GAC ACTIVATED CARBON FILTERS: Removes chlorine, odors and tastes of many organic compounds

THOROUGH FILTRATION: Removes chlorine, tastes, odors, sand, dirt, silt, and more! Provides fresh water without slowing flow rate!

HIGH QUALITY WATER: Provides clean, great tasting water for your entire house

COMPATIBLE DESIGN: Great for point of use water filtration applications