10 Best Reverse Osmosis Systems of 2021

Reverse osmosis water filtration systems are considered as the best and most efficient as compared to other filtration systems. They are capable of removing a whole range of contaminants up to 95 to 99%. Therefore, it is necessary for you to install an RO system in your house to get the best-filtered water every day.

But the selection of these systems is not easy as there are different types of RO systems available in the market. Also, many manufacturers claim that they make the best RO systems. Therefore, to make things simple for you, we have reviewed the ten best reverse osmosis systems of different types, including whole house, countertop, Undersink, and portable.

Also, there is a buying guide to let you know about what things that you must look at before purchasing your ideal RO system.

Best Reverse Osmosis Systems (Comparison)

	Best Reverse Osmosis Systems
	Editor's ChoiceAPEC Top Tier Alkaline Mineral 6-Stage Reverse Osmosis System Easy Installation 75 gallons/day 40 - 85 PSI filtration	LATEST PRICE →
	iSpring RCC7AK-UV Carbon KDF Filter Up to 99% efficient up to 0.0001 microns filter	LATEST PRICE →
	APEC Portable Countertop RO Water Filter System JG quick connect fitting 40-80 PSI filter 99% efficient	LATEST PRICE →
	Olympia Water Systems 5-Stage Reverse Osmosis Water Filter 50 gallons/day 5 microns PP filter Coconut shell carbon filter	LATEST PRICE →
	Home Master TMULTRA-ERP Undersink RO Water Filter filters up to 98% percent Advanced UV filter Economic Price	LATEST PRICE →
	Brondell RO Circle Water Saving RO Water Filter LED light for filter replacement 50 gallons/day Filter life 2 years	LATEST PRICE →
	Countertop Portable 5-Stage RO Purification System filters up to 99.6 percent 75 gallons/day 5 micron PP sediment filter	LATEST PRICE →
	AquaTru Countertop Water Filter Purification System filters up to 99.6 percent Quick filtration Easy setup	LATEST PRICE →
	Zero Installation Purifier Countertop RO Water Filter filters 0.5 gallons/second Coconut-based carbon shell BPA-free material	LATEST PRICE →
	Hydro-Logic 100-GPD Reverse Osmosis Filter 98% efficient RO Membrane life 2 years 100 gallons/day	LATEST PRICE →

1. APEC Top Tier Alkaline Mineral 6-Stage Reverse Osmosis Drinking Water Filter System – Top Rated Reverse Osmosis System

One of the best reverse osmosis systems that you can purchase for your homes is the APEC Top Tier. It is a 6-stage drinking water filtration system that removes various impurities from water to make it safe and healthy for drinking.

The product is made in the USA, so there is no need to worry about product quality. It provides 75 gallons of filtered water per day, which is sufficient for many houses or families.

APEC Top Tier requires 40 to 85 psi feed water pressure to eliminate 99% of different impurities from water. It removes various harmful chemicals, viruses, bacteria, cysts, and more.

The first stage of water filtration features a PP sediment filter that is responsible for eliminating sediment, dust, and rust from water. The second and third stages carry carbon block filters that improve the water taste, odor, and color by eliminating chlorine. Also, they take part in removing some chemicals and VOCs from water.

The TFC RO membrane is the part of the 4th stage of filtration where TDS and other contaminants are removed from the tap water. The fifth stage has a coconut shell refining carbon filter that filters any possible residual taste. And the last stage features an alkaline filter that adds calcium carbonate into the water for increasing the pH level to make it alkaline.

This RO system includes high capacity filters, TFC membrane/ post-filter, calcite acidic water neutralizer, Lead-free faucet, JG food grade tubing, storage tank, wrenches, and feed water adapter.

2. iSpring RCC7AK-UV Deluxe Undersink RO Drinking Water Filtration System – 7-Stage Undersink Reverse Osmosis System

Another high-quality RO filtration system is the iSpring RCC7AK-UV that you can installed under your sink to get the best-filtered water. It can treat both the tap and well water through seven different stages to make it clean, pure, and healthy for drinking.

The filtration system can eliminate various contaminants and pollutants from the tap or well water up to 99%. It possesses the ability to remove more than 1000 contaminants, including microorganisms, bacteria, viruses, chlorine, arsenic, fluoride, sodium, asbestos, calcium, and more.

The first three stages of filtration feature three pre-filters: One is the PP sediment filter. The second one is the Carbon KDF filter, and the third one is Carbon block filter. All these pre-filters are responsible for protecting the RO membrane from different chemicals and removing various large particles. Then the RO membrane removes all the other contaminants as small as 0.0001 microns. After that, the fine GAC filter checks any remaining impurity found in the water.

But here the filtration process not ends; an advanced and powerful 11 watt UV sterilization stage keeps an eye on microorganisms that might get passed the RO membrane. And in the end, an alkaline remineralization filter makes the water alkaline by restoring healthy minerals to make the water tastier.

The first stage of housing is transparent so that you can keep an eye on the condition of the filter. The product also offers easy installation, and the high-quality components require less maintenance. Other than this, live phone support allows you to call for any assistance.

3. APEC Portable Countertop RO Water Filter System – Best Countertop Reverse Osmosis System

APEC Water Systems offer a countertop RO water filtration system that can fit most of the standard faucets without any inconvenience. But if you have a sprayer faucet, pull-out faucet, or a special size faucet, then you can’t connect the filtration system with it.

This unit is also portable as it is quite light in weight. The best thing about this RO system is that there is no need to install it; all you need is to plug the unit and get the filtered water on the go. This 4-stage RO system is ideal to use in apartments, RVs, and mobile homes or students and travellers can also use it with convenience.

The filters used are of high-capacity and offers long-lasting and excellent performance. All the components used are made in the USA so that you can trust the unit without any hesitation. The unit requires 40 to 80 psi water pressure and can produce 90 gallons of filtered water per day.

This APEC portable countertop unit can remove various harmful contaminants from water up to 99%. It eliminates chlorine and improves water taste and odour. Moreover, it makes the water free from barium, chromium, fluoride, copper, lead, cadmium, and more.

4. Olympia Water Systems 5-Stage Reverse Osmosis Water Filtration System – Cheapest Reverse Osmosis Filtration System

Another quality RO filtration system on the list is from Olympia Water Systems. It is a 5-stage unit that can produce 50 gallons of filtered water per day. It is designed to fit under the sink, so it is ideal for installing it under your sink cabinet to get fresh and clean water every time you turn your faucet on.

The best thing about this RO system is that it is NSF certified. Also, it is a BPA and Lead-free product. The quick-connect fittings make the installation process easier. Moreover, it requires less maintenance, which is also a plus.

The first stage of filtration has a 5 micron PP sediment filter that makes the water free from sand, rust, dust, and silt. The carbon block filter works in the second and third stages of water filtration to reduce chlorine and improve the water taste and odor. Also, it targets different chemicals, VOCs, insecticides, and pesticides.

RO membrane is the part of the fourth filtration stage that filters chromium, arsenic, copper, fluoride, barium, and others. And the last filter is the coconut shell post carbon filter that further reduces chlorine, its taste, and odor.

5. Home Master TMULTRA-ERP Undersink Reverse Osmosis Water Filter System – Best RO System for Well Water

Another Undersink reverse osmosis water filtration system on the list is from the Home Master. The unique thing about this filtration unit is that it doesn’t have the canister filter housing design that is common in traditional RO systems. Instead, it has a modular filter design where the entire filter is disposable since the filter is integrated into the filter housing.

The advantage of this design is the fast filter replacement. Also, it prevents leakage and cuts down microorganism and biofilm build-up. Other than this, six water filtration stages remove sand, dust, rust, various chemicals, heavy metals, iron, and other impurities up to 98%.

This RO unit is also best for the well water. Iron is also found in the well water, so this product features an iron pre-filter that removes iron from the water with the help of advanced redox media KDF85. It is necessary to stop iron from reaching the RO membrane to save it from damages. Therefore, iron pre-filter is installed to secure the RO membrane.

Other than this, an advanced UV filter kills various bacteria, viruses, and microorganisms from well water to make it clean and pure for drinking.

6. Brondell RO Circle Water Saving Reverse Osmosis Water Filter System – Comes with Smart Water Saving Technology

This four-stage water filtration system from Brondell is another quality Undersink unit that you can use to get clean and pure water. It features a smart water-saving technology that saves ten times more water as compared to the traditional RO units.

It has a compact and space-saving design that saves a lot of space under your sink. Also, the filtration system meets the NSF/ANSI standards 42, 53, 58, and 372. It is also quite easy to install and can produce 50 gallons of filtered water per day.

The RO Circle is quite an effective filtration unit that filters various contaminants, including fluoride, chlorine, arsenic, copper, lead, chromium, cysts, and more.

The best thing about this product is that it features a flexible reservoir that offers consistent flow rate. The expansion and contraction of this system boost the overall efficiency without needing a pump or electricity. Moreover, the auto RO filter flushing extends the filter life by two years by automatically flushing the RO membrane.

Overall the filter unit is good, but the bad thing is that the replacement filters are hard to find. You can only buy them from the official site of the company by paying the shipping taxes along with the product price.

7. Countertop Portable 5-Stage RO Purification System – Connects with all Types of Faucets

Reverse Osmosis Revolution offers one of the best countertop reverse osmosis filtration systems that is made in the USA. It is a quality product that filters water through 5 different stages to provide you clean and pure water. You can use this portable purification system in your homes, apartments, RVs, and for traveling.

The high-quality RO membrane filters 75 gallons of water per day and 3 gallons per hour. The best thing about this unit is that you can connect it to any faucet, no matter whether it is a standard kitchen faucet, pull-down kitchen faucet, bathroom faucet, or the bathroom handheld hose.

This water purification system is capable of removing more than 600 contaminants from water. The 5 micron PP sediment filter removes dust and rust. The coconut activated carbon filter eliminates chlorine, VOCs, and different common chemicals. It also improves water taste, odor, and color.

The third filtration stage features TFC type RO membrane that removes many TDS, other elements, and various other harmful contaminants. The fourth stage has a mixed bed polishing filter, further cleans water, and removes radiation. And the last stage carries a T33 type coconut carbon filter that filters any remaining contaminant.

The life of each filter is around 8 to 12 months, but the RO membrane can work up to 3 years without a need for replacement.

8. AquaTru Countertop Water Filter Purification System – More Effective than Pitcher Filters

This BPA free reverse osmosis water purification system filters water through 4 different stages before reaching you. It is a countertop unit that removes 15 times more contaminants from water as compared to leading pitcher filters. It takes around 12 to 15 minutes to purify one-gallon tap water.

The mechanical pre-filter starts the filtration process by removing sediment and turbidity. Then the RO pre-filter comes into action to eliminate chlorine and chloramine. The third filtration stage features the RO membrane that is tested and certified to eliminate fluorine, lead, chromium hexavalent and trivalent, selenium, and more. And the last activated carbon VOC filter eliminates industrial solvents, chemicals, pesticides, herbicides, and other contaminants along with enhancing the taste of water.

The product is also easy to set up. There is no need to install it, nor does it require plumbing. It will take only your 3 minutes to start filtering water. Also, the on-off twist design of the filters makes replacement easier.

The drawback of this system is that it is not as durable as it could be. It doesn’t last for long. Also, some users have complained about water leakage.

9. Zero Installation Purifier Countertop Reverse Osmosis Water Filter – Best Countertop RO System for Homes/Apartments

This compact design and stylish RO water filtration system from PuricomUSA is ideal for apartments, codons, and RVs. This BPA free product offers clean, tasty, and healthy alkaline drinking water to meet the needs of its users.

The best thing about this unit is that it uses very less power that is only 24W. Also, it is quite easy to use. There is no need for installation or plumbing. All you need is to use your kitchen faucet for filling the bottom storage tank and press button to start the filtration process. After 15 minutes or so, it will convert 0.5 gallons of tap water into filtered water.

The first stage of filtration uses a sediment filter to remove sediment and rust. The second stage has a coconut-based activated carbon block filter to eliminate VOCs, pesticides, THM’s, and chemical residues. The third stage features the RO membrane that removes all harmful contaminants. And the last one uses alkaline post filter that restores essential minerals and makes the water alkaline.

The unit also notifies when you need to replace the filter through a red blinking light.

10. Hydro-Logic 100-GPD Reverse Osmosis Filter – Highest Water Production Capacity

The last RO filtration system on the list is the Hydro-Logic 31035 that can produce 100 gallons of filtered water per day. The best thing about this product is that it wastes 25 percent less water as compared to other RO filtration units.

This 2-stage water filtration unit can remove chlorine and other contaminants from tap water up to 98%. It is featured with Stealth RO100 reverse osmosis filter that is quite effective in eliminating various harmful impurities.

The RO membrane can last up to 2 years, but it is recommended to replace the filter every six months.

The bad thing about this filtration unit is that it does affect the water pressure. Also, cheap customer service and leakage problem are big concerns.

Buyer’s Guide

There are various things that you need to look at before selecting a particular reverse osmosis system. So, what are those things, take a look.

RO System Type

First of all, it is necessary to make sure what type of RO system you want to purchase. If you have a lot of space under your sink, then you can go for Undersink RO units. If you want to purchase a unit for your whole house, then there are whole house RO units available as well. Moreover, you can also go for countertop filters as they take less space and perform well. Furthermore, you can also have portable RO filtration units that are excellent for travelling.

Filtration Stages

The higher the number of filtration stages is, the more effective the product will be. This thing you must have to keep in mind before purchasing your product. The number of filtration stages also depends on the type of RO system you choose. But always make sure that the RO system has a maximum number of filtration stages according to its type.

Some of the reverse osmosis units have seven filtration stages whereas some are featured with 4. So, it is mandatory to go for those systems that feature at least 4 to 5 stages to filter your water. A good and effective RO system contains a sediment filter, carbon block filter, RO membrane, and a coconut shell post carbon filter.

NSF Certifications

Another important thing that you must look at is the NSF certifications. These certifications are important to make sure that that product you are buying is constructed with safe and quality materials and the water it produces is safe and healthy to consume.

These certifications include NSF Standard 42, 53, 58, 372, and 401.

NSF Standard 42: It ensures that the materials used in the construction of the system are safe. Also, it ensures structural integrity. Moreover, it also assures that the unit is capable of removing chlorine taste and odor from water.

NSF Standard 53: Along with the material safety and structural integrity of the filtration system, this NSF Standard 53 guarantees that the unit is for the reduction of various contaminants regulated by the EPA including VOCs, heavy metals, and cysts.

NSF Standard 58: This NSF Standard 58 is only for the RO system that ensures that the product can remove all types of contaminants from water.  

NSF Standard 401: This is for the removal or reduction of various pharmaceuticals and chemicals.

Water Production

Another factor that you should consider is the water production. How many gallons of water per hour or the day your filtration unit produces is necessary to find out before the selection. Some units can produce 100 gallons per day, whereas some can only produce 50 gallons of water. So, it all depends on your water consumption to select a particular product.

Ease of Installation

Generally, RO filtration units are quite easy to install. Also, the filter replacements are easier as compared to other filtration units. But if you want yourself to get free from any kind of installation, then it is ideal to go for the countertop RO units.