Best whole house reverse osmosis system 2020 (reviews & buyers guide)

One of the best ways to make sure contaminant presence in your water are removed is installing the whole house reverse osmosis system.

I hope everyone will agree with me the water we get from our tap is not healthy/safe for human consumption. That’s why every home needs to install the water filter to remove water contaminants found in water. 

whole house reverse osmosis system

Before we provide the list of best whole house reverse osmosis system lets understand this technology.

Comparison table of the best whole house reverse osmosis system

product name

filtration stage
where to buyadditional features
APEC Top Tier 5-Stage511” x 11” x 15
150Buy from Amazon
APEC Top Tier Supreme Certified High Flow

515 x 7 x 18
190Buy from Amazon
APEC Top Tier Alkaline Mineral pH616 x 5.25 x 17.5
75Buy from AmazonUltra-Safe pH+ Alkaline Re-Mineralizing Calcium Filter
iSpring RCC7517.5 x 14.5 x 5.25
175Buy from Amazon
iSpring RCC7AK
iSpring RCC7AK
618 x 14.5 x 5.25
175Buy from AmazonAlkaline Remineralization Filter
iSpring RCC7AK-UV714.5 x 5.2 x 19.5
175Buy from AmazonAlkaline Remineralization Filter and UV Sterilizer
Express Water 5 Stage516 x 18.25 x 19
150Buy from Amazon4 extra set of replacement filter
Home Master TMAFC-ERP-L7575Buy from Amazonnon-electric permeate pump,catalytic carbon filtration
Global Water RO-505514 x 5 x 16
Buy from Amazon4 extra set of filter
Watts Premier RO-Pure 531411412 x 4 x 12
50Buy from Amazon

What others are reading 

What is Reverse Osmosis Water System?

 Reverse Osmosis is a water purification method which uses a semipermeable membrane to remove water contaminants such as heavy metal, dead bacteria, dissolved impurities, and large particles. In short, is called RO.

The method involves a number of filtration stages. Each stage removes specific contaminant in water. Most of the reverse osmosis system comes in four, five or six stages.

The following are some of the contaminants that are removed by Reverse Osmosis system:

  • Lead
  • Chlorine
  • Fluoride
  • Pesticides
  • Mercury
  • Arsenic

It is significantly used to purify water from lakes, river, and tap water (public water supply).

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How Ro water system works

In Reverse Osmosis, water passes through a semi-permeable membrane which has small pores that only allows clean water to pass through and water containing contaminants is blocked.

There are additional filters (like Sediment filter, Granular Activated Carbon, Micron Carbon Filter, Thin Film Membrane RO Membrane, Inline Granular Carbon Filter and Polishing filters) in the process which remove impurities and then you remain with clean, safe drinking water.

Must watch the video how reverse osmosis water system works

5-stage Reverse osmosis system

5-stage Reverse osmosis system

Express Water RO5DX  Reverse Osmosis System 


5-stage Reverse Osmosis Water System

Check latest price here

It Purifies water in 5-stages which have – Sediment filter, Granular Activated Carbon, Micron Carbon Filter, Thin Film Membrane RO Membrane, Inline Granular Carbon Filter and Polishing filters

  • Sediment filter  which removes inorganic particles- this is large particles and fine particles such as sand, mud, silt, and rust
  • It has GRANULAR ACTIVATED CARBON (GAC) Filters and MICRON CARBON FILTER which removes chlorine, odors, organic chemicals, suspended particles, unnatural taste, dirt and other chemicals in tap water.
  • It has a Thin Film Membrane RO Membrane. It’s the main component of any reverse unit which removes viruses, pesticides, bacteria, total dissolved solids and chemical up to 99%
  • It has Inline Granular Carbon Filter and Polishing filters which help in stabilizes water tasting quality and removes traces of bad taste and odor

The system is recommended for water containing maximum TDS of 1000 parts per million (PPM).

System filtration capacity of 50 gallons per day and storage tank capacity of 4 gallons.

Features long-lasting filters of the highest capacity standard meaning you will only change filters after every six months.

When it comes to installation the company has made everything easy all connections are labeled and have Color Coordinated caps to match where each hose must be inserted.

In the box, there are all filters needed for set-up, extra filter set for 1st replacement, storage tank, tank stand and leak stopper (shuts off water flow when it detects unwelcome moisture). The product dimension is 18.2 x 19 x 16 inches.

The material of the system is steel tank, plastic system, and brass faucet.

Best for the house, apartment, residential, well water, industrial, RV, machine, and office use and installed under the kitchen sink.

The Express Water Reverse Osmosis Water Filtration System is certified by an independent laboratory for NSF standards.

This reverse osmosis system operates on 40-80 PSI water pressure.


With all connection labeled and color coordinated caps to match makes installation easier


You may need additional tubing or delivery pump depending on how far you are planning to install.

If water pressure is below or above 40-80 PSI water pressure you may need a booster pump or pressure regulator depending on your water pressure.

APEC Water Systems RO-90- Top Tier

Best Reverse Osmosis Water System for well water

Check latest price here

The system is designed and assembled in the USA.

To guarantee safety and your health the system filters water in five stages which is equipped with super capacity filters (Sediment Filters, Carbon block, Filmtec RO Membrane, refining coconut carbon filter). The filters are NSF certified.

In addition to safety, the system comes with an FDA Certified JG Food grade tubing, lead-free designer faucet, and other parts to provide safe, contamination-free pure water.

With high-quality leak-free quick connect fittings require no extra lock clips to seal leak, and does not rely on a water leak detector to protect your home like other brands.

The premium long-lasting filters used to treat well water and tap water.

It is also WAQ gold seal certified to remove impurities such as chlorine, heavy metals, fluoride, lead, bacteria, copper, cadmium, radium, barium, viruses and arsenic

APEC water system provides refreshing crisps taste, superior to bottled water and good water ideal for drinking and cooking.

System filtration capacity of 90 gallons per day and has the storage tank

For installation, there is step by step online installation video and detailed instruction. The installation is easier just set it and forgets.

The company provides excellent and free technical support for the entire lifetime.

The whole unit size is 15 x 7 x 18 inches which are enough size to fit most kitchen cabinets


The system is capable of producing 90 gallons per day and is a 5-stage water filtration system

Easy to follow installation instruction included in the package and online

It provides water with good taste


When installing if you don’t tighten well you may experience leakages.

Global Water RO-505 Reverse Osmosis System

5-stage reverse osmosis system

Check latest price here

The system filters 1000+ contaminants such as chlorine, fluoride, lead, arsenic, bacteria, and others.

With 24 hours technical support and installation kit makes installation steps easy, convenient and secure.

To guarantee quality, health, and pure water the system has 100% lead-free faucet and steel tank comply with NSF or ANSI standard.

It filters water in 5 stages and product dimension of 14 x 5 x 16 inches.

Stages of the specification include:

1st Stage: Polypropylene 5-micron Sediment filter which removes the particles, dust, mud, sand and other particulates.

2nd Stage: GAC coconut shell activated carbon 10-inch filter helps to remove the organics, bad smell, chlorine, colors, turbidity, and other VOCs chemicals.

3rd Stage: CTO 5 micron coconut shell block carbon filter clears contaminants such as cloudiness, chlorine, VOCs chemical, odor smell, and taste.

4th Stage: RO membrane- High-quality TFC RO membrane that removes contaminants such as chlorine, fluoride, heavy metal, salt, arsenic, bad mineral substance, lead, and other dissolved chemicals.

5th Stage: polishing filters and has Inline filter cartridge quick connects- reduces bad tastes and odors.

In the set includes RO system, 2 sediment filters, 2 GAC activated carbon filters, 2 CTO block carbon filters,1 Membrane, 2 Inline filters, Tank, Faucet, Colored Tubing, Installation Kit and Valves. The system provides four extra set of filters.

7-stage Reverse osmosis system

7-stage Reverse osmosis system

Home Master TMAFC-ERP-L Artesian Full- Undersink Reverse Osmosis Water Filter System

7-Stage reverse osmosis system

Check latest price here

With 7-stages of purification removes 99% of the contaminant such as chlorine, lead, and chloramines.

Except for filtration, the system has patent full contact technology that adds calcium and magnesium mineral twice during water purification process for greater tasting.

The home master system is designed to solve the problem which traditional system was not able. It uses powerful catalytic carbon filtration to treat stubborn chemical disinfectant chloramines but the traditional system uses an ordinary carbon filter.

The system comes with a non-electric permeate pump which improves system efficiency and faster flow rate. The pump reduces water waste by up to 80% and increases water production to 50%.

The product uses a modular all in one filter design where the entire filter is disposed, unlike the old system which uses canister filter design where only the filter is changed. This makes Sediment, microorganisms, and biofilm accumulate in the canisters causing canisters to weaken and begin to leak and ultimately fail.

The filters are changed annually and are easy to change with just push in fitting. You don’t require wrenches to change.

You don’t need a plumber to install the package comes with the installation instruction. Also, installation videos and live support is available

It has a five-year limited warranty and in the box include storage tank, 3/8-inch feed water adapter with shut off valve, RO faucet, RO adapter, drain saddle, fully assembled purification unit with RO membranes and filters.

Additional features Standard Brushed Nickel RO Faucet, Fridge Connection Kit, and Dow Filmtec High Hardness RO membrane

The system has a capacity 75 GPD, 3.2-gallon storage tank and product dimension of 16 x 20 x 12 inches

Express Water Alkaline Ultraviolet Reverse Osmosis Filtration System 

Alkaline Ultraviolet Reverse Osmosis Filtration System

Check latest price here

The 7-stage reverse osmosis system is suitable to remove contaminants such as Arsenic, Lead, Nitrates, Fluoride, Calcium, Chlorine, and Bacteria.

It has Powerful UV Sterilization, which eliminates viruses, coliform, E. Coli, bacteria, and microorganisms.

Features actives mineral technology which makes Express Water Alkaline Ultraviolet Reverse Osmosis Filtration System adds Calcium, Potassium, Magnesium, and other minerals your body needs right in your water.

This system comes with clear filter housing that helps easily monitor the cartridge condition and pressure gauge that monitor the incoming water pressure to the Reverse Osmosis system. The pressure gauge help prevents the problem with low and high pressure up to 160 Psi.

The membrane element purifies 100 gallons per day.

It filters water in 7-stages:

1st Stage: 5 Micron Sediment Filter – removes silt, dirt, rust, sediment, sand, and scale.

2nd Stage:  The Granular Activated Carbon filter cartridge (G.A.C.)- Removes chlorine, organic chemicals, suspended particles, unnatural tastes and odors, dirt and other chemicals found in tap water

3rd Stage: Carbon Block treats organic chemicals, chlorine, suspended particles, unnatural tastes and odors, dirt and other chemicals found in tap water

4th Stage: Reverse Osmosis Membrane (100 GPD) -Removes Bacteria, Viruses, Pesticides, Ai, Pb, Cd, Hg and Total Dissolved Solids including many other unhealthy contaminants.

5th Stage: Alkaline Remineralization – The water is Naturally Mineralized and Alkalinized pH+

6th Stage: UV Ultraviolet Light – The Ultraviolet Light sterilizes and sanitizes the water to effectively eliminate up to 99.99% of cysts, viruses, micro-organisms and harmful bacteria like E. Coli, Fungi, Algae, etc.

7th Stage: Post Carbon filter – It is also called Polishing Filter because it is the final stage of any standard reverse osmosis system. Made from high-quality coconut shell carbon, the inline filter stabilizes the water taste, quality and further removes any traces of bad tastes and odors.

6-stage Reverse osmosis system

Best 6-stage Reverse osmosis system

iSpring RCC7AK – Under-Sink Reverse Osmosis

6-stage Reverse Osmosis System

Check latest price here

This reverse osmosis system is mounted under the sink which is best for removing contaminants such as chlorine, asbestos, fluoride, arsenic, viruses, calcium, sodium, bacteria, giardia, hormones and lead.

The iSpring RCC7AK adds a special alkaline re-mineralization filter to remineralize water. After the reverse osmosis process and before the faucet, water passes through the alkaline re-mineralization filter. This filter is made up of two parts half red mineral stone and half calcite.

The half red mineral stone adds back mineral that was removed during the purification process. Such minerals include ionized calcium, magnesium, sodium, and potassium.

The half calcite neutralizes PH.

For quality guarantee, the system filters water into 6 stages, has WQA gold seal, 1-year warranty and lifetime technical support.

All filters, tanks, tubing, and other water-contacting parts are manufactured to comply strictly with FDA and SDF/ANSI standards for safety and water quality.

The system has a size of 18 x 14.5 x 5.25 inches and the holding tank measures 16 x 11 inches which make both tank and body fit nicely at the under- sink cabinet.

In the box there is an RO machine, transparent pre-filter housings, filter packs including alkaline PH filter, house wrenches, 4-color tubing, feed water adapters, 3.2 gallons pressurized tank, drain saddle, spare fittings, O-ring, lead-free solid brass body faucet with a brushed nickel finish which is mounted on the counter as the main output for the RO water.

The long-lasting multi-layer membrane filters 75 GPD and 2.5 gallons holding capacity.

With written installation procedure, video and technical support make the installation process easier. For leak free installation simply push tubing ½ inch deep into quick-fitting connectors and lock – no threading pipes needed.

4-stage Reverse osmosis system

4-stage Reverse osmosis system

Watts Premier RO-Pure 531411 4-Stage Reverse Osmosis System

4-stage Reverse Osmosis System

Check latest price here

The watt premier is a 4-stage water purification system which removes contaminants such as sediments, chloramines, lead, arsenic, perchlorate, chromium, copper, radium, chlorine, cysts (such as Giardia and Cryptosporidium), bacteria, and viruses.

The 4-stage water purification system includes:

  • 5-micron Sediment Pre-Filter which traps sediments, dirt, and rust.
  • 5-micron Carbon Block Pre-Filter help in reducing chloramines, chlorine, unpleasant taste and odors
  • RO membrane- treats total dissolved solids (lead, arsenic, perchlorate, chromium, copper, and radium), cysts, bacteria, and viruses.
  • Carbon Post-Filter- it is polishing filter

It treats 50Gallon per day, maximum operating pressure 100 psi, product dimension of 12 x 4 x 12 inches and 3-gallon storage tank.

The watt premier Reverse Osmosis System has check valves fixed between cartridges to put a stop to back-flow and shut off valves in each filter head that shuts off the water flow when cartridges are removed.

The cartridges have double O-ring to prevent leakage and the unit has a compact design that requires small space undersink.

The Global water reverse osmosis system filter change is easy it has electronic monitor lets, you know when to change the filter and filter change is just a push of a button. Also with contained filter snaps into place, including the RO membrane and auto-shutoff valves built-into each filter head, you do not need to turn off the water supply to the system and there’s no waiting for the system to depressurize.

The system is tested and certified by WQA, NSF/ ANSI, and the package has an RO Pure Reverse Osmosis module (complete with filters), storage tank and faucet.

Make sure the system is properly installed and maintained in a minimum incoming water pressure of 40psi for it to operate as designed.

4-stage Portable Reverse Osmosis RO Revolution Water Purification System

4-stage portable reverse osmosis system

Check latest price here

The system easily attaches to your kitchen faucets without the need of a plumber.

This RO system delivers 3 gallons per day and has 75 GPD RO Membrane.

If you are looking for a portable Reverse osmosis System, the revolution system ideal portable solution for aquarium, RVs, home, apartment and during travel time.

It comes with chrome metal 2-way diverter for the kitchen faucet and fits almost all kitchen faucet. But if you need a garden or laundry diverter the company can exchange the 2-way diverter garden/laundry hose diverter.

The Reverse Osmosis Revolution is best for removing arsenic, aluminum, chloride, calcium, bicarbonate, cyanide, sodium, sulfate, potassium, barium, iron, nitrate, mercury, zinc, selenium, lead, phosphate, magnesium, fluoride, nickel, cadmium, detergent, herbicides, insecticides, and strontium.

It filters water in 4-stages. This includes:

1st stage: 5-micron sediment filter- it helps to remove rust and dust particles, therefore, help in extending the life of the system and membrane.

2nd stage: Premium Quick-Connect T28 coconut activated carbon filter- it assists in reducing volatile organic compound (VOC), chemicals, chlorine, cloudiness, offensive odors, colors, and unpleasant tastes.

3rd stage:  Reverse osmosis membrane-eliminates total dissolved solids (TDS), Arsenic, viruses, fluoride, chromium, lead, radium, and bacteria.

4th stage: post filter.

The system has replacement filter available online Universal 3 Filter Set for 4-stage Portable (Countertop) Reverse Osmosis Revolution Systems.

10-stage Reverse osmosis system

10-stage Reverse osmosis system

Global Water ROPH9 10-Stage ALKALINE Reverse Osmosis System 

10-stage reverse osmosis system

Check latest price here

The 10 stage Reverse osmosis system helps reduce chlorine, bacteria, lead, arsenic, and fluoride. The stages include:

1st Stage: PP 5 micron Sediment help in removing the particles, dust, mud, and sand.

2nd Stage: GAC coconut shell activated carbon, which removes the chlorine, odor smell, colors, and other VOCs chemicals.

3rd Stage: CTO 5 micron coconut shell block carbon-removes cloudiness, chlorine, odor smell/taste and other volatile organic compounds (VOC) chemicals.

4th Stage: RO membrane-helps removes contaminants such as heavy metal, chlorine, lead, fluoride, and other dissolved chemicals.

5th-9th Stages(ALKALINE): Raises PH level in the water to keep your body healthy. The alkaline filter contains Bio Ceramic Activate, Tourmaline Vibration, Calcite, Porphyries Andesite Minerals, and Carbon Crystal Negative Potential.

10th Stage: Inline (polishing filter)-removes all possible rough taste/odors.

The system is tested and guaranteed lead-free faucet and steel tank by NSF/ ANSI.

What happens to the water that has contaminant?

One of the disadvantages of an RO system is the amount of water wasted in the process. Domestic RO system uses four gallons of contaminated to produce one gallon of filtered water. Three gallons goes to waste, but you can reduce this by adding permeate pump to reduce water wastage. Some system like Home Master TMHP HydroPerfection Under Sink RO System comes with a pump.
The Home Master TMHP HydroPerfection Under Sink RO System reduces the amount of water wastage to one gallon for every gallon produced.
Other systems have advanced technology like Brondell H2O+ Circle Water Saving that reduces the amount of two gallons for every of pure water produced
All the same, there is the volume of water that will be wasted that is the concern for every person. In the system, there is a drain pipe or waste pipe. You can connect your waste pipe to the normal faucet or have a collection point and use that water for cleaning, flushing toilet or watering crops.

Stages of RO water system

Most Ro water system involves five stages of filtering

  1. Sediment filter– Removes fine and large particles such as sand, silt, and dirt. It also prevents sediment to go through Reverse Osmosis Membrane which is damaged by sediments
  2. Carbon filter– It consists of Activated Carbon, Micron Carbon filter, and Inline Granular Carbon Filter. It helps to remove unnatural tastes, chlorine, odor, suspended particles, organic particles and another chemical that can be found in public water supply.
  3. Reverse Osmosis Membrane– It’s the main component which removes bacteria, viruses, pesticides, chemicals, and other dissolved impurities.
  4. Polishing filters – Its final stages or final filter which stabilizes water taste quality and removes any traces of bad odor.

Extra stages

Stage 6: there are important minerals that are removed by the process. At this stage, you can alkalize water or adjust PH using calcium and magnesium. This stage is called Remineralization

Stage 7: use the UV filter to kill the microorganism

 Read more about Reverse Osmosis (

What impurities does Reverse Osmosis system remove?

Reverse osmosis water system operates in five stages and each stage is meant to remove the particular contaminant.

The sediment filter is meant to remove sand, silt, and large particles. Removes impurities 0.001 microns

The carbon filter is best for removing chlorine, bad taste, and odor

Reverse osmosis membrane which is the heart of the system removes a wide variety of contaminants such as sodium (salt), sulfate, calcium, potassium, nitrate, iron, zinc, mercury, selenium, phosphate, lead, arsenic, magnesium, nickel, fluoride, manganese, cadmium, barium, cyanide and chloride

Read more the percentage RO membrane removes 

What is Ro water purifier or filter?

Ro water purifier or filter is a water purifier which uses Reverse Osmosis (RO) technology to purify water.

Advantages of Reverse osmosis water system

  • The best solution for treating hard water or salt water
  • RO water purifier removes heavy metals such as lead and mercury which is dangerous to the human being.
  • Removes small and large particles thus give clean, purified water
  • Removes bad odor from water
  • It’s easier to maintain compared with other purifiers which require being cleaned every month
  • RO water purifier comes in small sizes, so they are best for home use

Disadvantages of Reverse Osmosis water system

  • Requires electricity to operate- It’s not best product in the areas which has the power problem.
  • Water wastage- a lot of water is wasted in the process of purification. Ro water purifier rejects water which contains dissolved impurities, but this water can be used for cleaning
  • Ro water purifier requires high pressure to purify- If water from public supply doesn’t have high-pressure one needs the motor to increase pressure
  • Water taste is changed in the process- The process of purification some minerals are removed it alters the taste of water
  • In RO water system there is a high chance that some of the microorganism can pass through RO membrane thus doesn’t kill water-borne diseases that are why it is advised you pass RO water through UV purifier to kill microorganisms.
  • Removes natural minerals such as calcium, magnesium, iron, and sodium which are required in water and are essential to the human body. Causing mineral deficiency in the human body.

How much maintenance cost does Ro water system require?

Most Ro water purifiers last for about 10-15 years if they are properly maintained.

Filters and Reverse Osmosis Membrane requires replacement depending on the quality, manufacturer’s instructions, water quality, and usage.

Sediment filters are changed after six months; carbon filter is changed between 6-12months and RO Membrane are changed every 2-3 years

Note that replacement recommendations are listed under each product according to your manufacturer.

Note that replacement recommendations are listed under each product according to your manufacturer.

There are many different RO water purifiers in the market but most of them differ in various ways such as:

  • Numbers of filtration stages– some purifiers purify water in 3 stages others 5 or 4 stages.
  • Storage and system purification capacity – It’s measured in gallon per day (GPD)
  • Quality of their components

What you need to know before you purchase RO system

Where do you need to set up your RO system?
There are two places you can install your RO system under the sink or at the countertop. If you require to set up under the sink make sure there is enough space the whole system will fit properly
The PH level of your water
Test your water and check the level of PH. If your water is acidic buy a system that has an extra stage to balance and stabilize PH level.
Contaminant presence in your water
You need to know which contaminant is the existence of your water so that you can choose the right system to remove them. The system that operates well reduce about 90% of most contaminant found in water

We have researched to find the best RO water purifier in the market and their features.

What to consider before purchasing Reverse Osmosis water system

What to consider before purchasing a Reverse Osmosis water system

Contaminant it removes

You must know what type of the contaminant the system removes effectively. Buy a system that removes most contaminant found in water. You will not worry about the water that you are consuming.

Easy to install, use and maintain

How easy it is to install, use or maintain. Some require professional to install how much will it cost for that. Remember filters needs to be changed every year will it be easier to change and how much will it cost.

Production capacity

The capacity of the reverse osmosis system is measured in gallons per day (GPD) and it depends on the amount of water you use per day. If your usage is small, a System filtration capacity of 50 gallons per day (GPD) is enough but if your usage is heavier something closer 100 GPD is okay.

How much water waste

One of the disadvantages of an RO system is water wastage. You should consider how much water waste will result from the system.

Purification Stages

RO system has seven purification steps. The first three are most important.  The systems you are going to choose to depend on the impurities present in your water source.

Additional features

Some systems come with additional features such as faucet, extra filter, and filter replacement alert

Warranty and customer care service

If the system doesn’t achieve what it should, will the company repair or replace the system?

Where to install the system

Most systems are of the same standard size make sure before you buy you know the dimension of the system and it fits well the place you want to install

Choosing the best replacement cartridges, membrane, parts, and accessories that go well with your RO water system read the following:

Best Reverse Osmosis Parts and Accessories

Components of the RO system

  • Sediment filter
  • Reverse osmosis membrane
  • Carbon filter
  • Storage tank
  • Post-filter
  • Valves
  • Flow restrictor
  • Faucet
  • Drain line

Acquire the best RO water purifier with the help of our guide here

reverse osmosis

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