Top 4 Best 5 Stage Water Filters – Compared

The most effective and economical way to get pure and healthy water for drinking purposes is to install an under sink water filtration system. A 5-stage water filtration unit offers you just what you need: Pure and healthy drinking water.

Picking the right unit can be a very confusing task. We have solved this confusion for you and selected the top 5-stage water filtration systems. We will critically evaluate all these systems in the following article.

Also See: Best 3-stage Whole House Water Filtration Systems

Best 5 Stage Water Filters (Comparison)

 Best 5 Stage Water Filters 
Editor's ChoiceiSpring RCC7 Under sink water filter
  • Filtration capacity of 75 gallons/day

  • 2-3 years filter life

  • 0.0001 microns filtration limit

APEC Top Tier 5-Stage Ultra Safe Water Filter
  • 50 gallons per day filtration capacity

  • 100 percent lead-free faucet

  • FDA certified

Olympia Water Systems OROS-50
  • 50 gallons per day filtration capacity

  • RO Filtration System

  • Easy installation

NU Aqua Platinum Water Filter System
  • 100 gallons per day

  • 5 years warranty

  • Easy installation


1: iSpring RCC7 High Capacity Under Sink 5-Stage Reverse Osmosis Drinking Water Filtration System and Ultimate Water Softener

  • Filter life: 2 – 3 years
  • Filtration power: 0.0001 microns
  • Capacity: 75 gallons/day

More Features: This water filter removes more than 1000 contaminants from water. The installation process is super easy.

iSpring Reverse Osmosis water purifier

Filtration Capacity: The RCC7 model has a filtration capacity of 75 gallons per day of drinking water. It is enough for any family size for drinking, washing eatables, cooking, and drinking water for pets.

Filtration Capabilities: The 5 stages of water filtration ensure that you get 99 percent pure water. It can filter over 1000 contaminants like chlorine, fluoride, arsenic, lead (up to 98 percent), calcium, sodium, bacteria, viruses, industrial solvents, sediments, and much more.

The first filter is the sediment filter, and it needs to be changed after a year. The second and third filters are granular activated carbon filter and carbon block filter, and they remove chlorine, odors, cloudiness, volatile organic compounds, and harmful compounds.

Both of these filters also need to be changed after a year. The fourth stage of filtration is the RO membrane; it produces around 75 gallons of water with the same quality as bottled water and can last or 2-3 years. The RO membrane can track down particles to 0.0001 microns.

The last and fifth stage is the post-carbon stage; it ensures that any residual chlorine is filtered from the water source.  You do not get to enjoy pure drinking water; you will also notice a visible taste improvement in your tea, coffee, and food.

Installation: All the items needed to install the unit comes along the system. It can fit under a standard kitchen sink. You need to read the instruction manual before installing it. For a leak-proof installation, insert the tubing ½ inches in the connector pipes and lock them up.

Technical Details: The pressurized tank has a capacity of 3.2 gallons. The feed water adapter fits both 1/2″ NPT & 3/8″ components.

Our opinion and Verdict: A very effective and functional 5-stage filtration unit. The unit comes with a 1-year warranty and an excellent customer service helpline for a lifetime. We recommend this system for pure and healthy drinking water.

2: APEC Top Tier 5-Stage Ultra Safe Reverse Osmosis Drinking Water Filter System (ESSENCE ROES-50)

  • Tank size: 4 gallons
  • Water pressure: 50 Psi
  • Filtration Capacity: 50,000 gallons/day

More Features: It remove rust, dirt, sand, and other particles. It also removes chlorine, bacteria, viruses, and insecticides. The 5-stage water filter also improves the taste and removes odor from water.

APEC high-tech water filter

Filtration Capacity: APEC offers a maximum of 50 gallons per day of water filtration. It depends on the supply pressure of your water. If the pressure is around 50 PSI, the system will filter approximately 30 gallons per day. The pressurized tank has a capacity of 4 gallons, which is higher as compared to the model listed above.

Filtration Capabilities: The first filter removes sediments; the second and third filter removes chlorine, bacteria, viruses, harmful organic compounds from your water.

On the fourth stage, the RO membrane ensures that nothing dangerous remains in your water. It acts on heavy metals like arsenic, lead, chromium, cadmium, radon, fluoride up to 99 percent. At the fifth stage is the pressurized tank with a coconut carbon filter which removes any harmful residual from your water and eliminates odors from it.

Technical Details: The faucet is 100 percent lead-free. All the components are 100 percent FDA certified and do not contain any harmful materials. The pipe size is ¼ inches.

Installation: All the tools needed to install the system like a housing wrench, tubing, water adapters, and connectors come along the package. All you need to do is to arrange the equipment and material, go through the installation guide and you will be done within a couple of hours.

Our Opinion and Verdict: It offers a slightly less amount of water filtered per day as compared to other models. Other than this, it is a fully functional unit and is recommended by our side.

3: Olympia Water Systems OROS-50 5-Stage Reverse Osmosis Water Filtration System with 50GPD Membrane – NSF Certified

  • Flow rate: 3.5 gallons per minute
  • Best for: 3/8 inches supply line
  • Filtration Capacity: 50,000 gallons/day

More Features: Olympia RO water filter is super easy to operate even for a teenager. It’s easy to install as you don’t need extra instruments for installation.

Olympia water purifier

Filtration Capacity: With this unit, you can get a maximum of 50 gallons per day of pure water. The storage tank is 3.2 gallons, which means that you can access 3.2 gallons of water in one go with maximum speed.

Filtration Capabilities: This model has identical filtration qualities to the one discussed above, and it can also remove 99 percent of all the harmful contaminants from water.

The sediment stage removes sediment. The next two filters are carbon filters to remove chlorine and other unhealthy substances from your water. The RO membrane tracks down any residual elements and stops particles as small as 0.0001 microns. The last filter further removes chlorine and provides you with purest drinking water.

Installation: All the stuff needed to install the system is included in the box. You get housing wrench, Teflon tape, drain saddle valves, adapters, and a user guide to walk you through the installation process.

Technical Details: It is NSF certified model. The unit fits with 3/8 inch supply lines and comes with different color tubing to make the connections easy.

Our Opinion and Verdict: A simple, easy to operate, and functional machine. Some users have reported issues with their customer helpline service, but it is not something that can deduct marks for the overall performance of this unit.

4: NU Aqua Platinum Series Deluxe High Capacity 100GPD 5-Stage Under Sink Reverse Osmosis Ultimate Purifier Drinking Water Filter System – Bonus PPM Meter and Installation DVD

  • Tank capacity: 4 gallons
  • Best for: Heavy metals, sodium sulfates, and chlorine
  • Filtration Capacity: 100 gallons/day

More Features: The installation process of this water filter system is very easy. It comes with 5 years warranty and a free lifetime support.

NU Aqua water filter

Filtration Capacity: The NU Aqua offers 100 gallons per day filtration capacity with a pressurized tank of 4 gallons. 100 gallons per day is enough to meet the water requirements of a large family, a small restaurant, or a medium-sized business facility.

Filtration Capabilities: The 5 filtration stages work together to provide you with purest drinking water. The first stage is the sediment filter and filters particles like dust, sand, dirt, and rust. The second and third stages are carbon filtration. The filters on these stages ensure that chlorine, pesticides, insecticides, herbicides, bacteria, viruses, pharmaceuticals, and industrial solvents are removed from your water.

On the fourth stage, the RO membrane tracks down heavy metals, sodium sulfates, and any residual chlorine from your water source. The fifth and final stage further reduces and captures any residuals left.

Installation: You do not need to contact any professional plumber for installation. All the tools required and instructions for installing the plant come with it. The company provides a DVD to guide you in a step by step installation and ensuring a leak-proof installation.

Our Opinion and Verdict: It comes with a 5-year warranty and lifetime support for any problem. The system results in 99 percent pure water. If you are looking for a filtration system with an extended warranty, this one is the most suitable filtration system for you.


We are sure that after reading this article, you have made your mind to buy your favorite 5-stage installation unit from our list. All the systems included in the above list are highly-functional, effective, and economical.

A 5-stage system may look expensive, but it is very economical in the long run as compared to water dispensers or other filtration options for drinking water.

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