Watts Premier 4-Stage Undersink Reverse Osmosis System Review

The Tap water is not clean enough to drink. How much tap water travels before reaching your faucet, might be 1 mile or 2 miles, who knows?

All the contaminants and chemicals in the pipelines join the race to reach your home. These contaminants cause odor and unpleasant taste of water.

Watts premier 4 stages reverse osmosis system is one of the best and affordable under sink systems to produces safer and healthier water. It is capable of removing 99% of contaminants from your Tap water.

You may not want to compromise on the health of your family. The purification process of this premier water system will reduce your visit to the doctor.

Interested to know more?

Let’s Dive into detail

Watts premier 4-Stage Reverse Osmosis System Review


Features of Watts Premier 4-Stage Reverse Osmosis System


The efficiency of the system is determined by the water waste ratio.

Water waste is common in all RO water filters. You can’t expect the purified water from the Reverse osmosis system without some wastage. Although, the ratio of water waste varies from system to system. It also depends on the feed water pressure & temperature.

For the Watts premier 4-stage RO-system, we don’t have any authorized water waste ratio from the manufacturer. But the tests have shown that this system waste between 3-4 gallons for producing a gallon of purified water.

Water Production

Water Production may change due to the feed water pressure and water temperature. But, at the standard pressure and temperature, it is capable of producing 50 gallons per day.

It is ideal for a small and medium-sized families. This water production may not be enough for larger sized families. You can check APEC RO-90 which is best for larger families.

While with the water pressure of 40 psi it can work effectively. The pressure below 40 psi can reduce the performance of your Undersink RO system. It is the standard pressure that every household usually has.  So, you don’t have to take tension about this.

If you want to confirm, you can check the water pressure at your home using this Simple Method

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Filtration Process

Watts premier has the 4-stages of the filtration process. It removes 99.9% of contaminants form feed water.

All 4 stages of the process have their own task to do.

Check this out:

Stage 1: This stage ensures that the passed water must be free from rust & dust. In short, this stage has the charge to remove all the sediments and particles from water that has an impact on the watercolor and taste.

Stage 2: There are many particles that cause the odor in your water and change the taste of water to be more undrinkable. Stage 2 works to remove all these particles from water.

“Filters work at stages 1 and 2 is known as pre-filters. Their performance has a direct impact on stage 3 filter that is RO-Membrane.”

Stage 3: At this stage, RO-Membrane gets into action. It removes up to 99% of all the possible harmful contaminants and TDS from the water. The contaminants include arsenic, viruses, fluoride, cadmium, bacteria & many more. Reduction in nitrites and nitrates also occur during this stage.

“The filters that work after RO-Membrane are called as Post filters. They give final touches to water treatment

Stage 4: This stage is installed to ensure that you are drinking completely pure water. When you turn on the faucet, this stage of the process eliminates all the rest of the particles and contaminants that previous stages may leave in water.


We have reviewed only convenient, trustworthy, durable, and well-performed RO systems. There are many Osmosis water filters that cause a headache and frustration instead of making your life more convenient. But it is not the case with watts premier RO pure system. 

The mounting process of this filtration system is straight-forward. You are not supposed to have some professional assistance for this task. 

Instructions manual

If you are new to the reverse osmosis system you can use the Instructions manual that comes along with the system. The instructions Manual is Concise, easy to understand, and well-written.

Before starting the process you must spend some time reading the instructions manual, to reduce the installation duration and the damages. 

Faucet installation

Air Gap faucet installation in the only step in your installation process that may take a little bit more effort. The faucet needs to be installed in your kitchen sink before having purified water. The faucet installation requires a hole of 1 ¼” diameter in your sink.

Your installation process might be more effortless if your sink already has a hole. Otherwise, you have to drill the hole to set up the faucet. Drilling the hole is not that difficult, but it usually increases the installation process duration.


Filter replacement

Watts premier Filter replacement is essential for keeping the performance at the maximum level. If you have done the installation of the system by yourself, then the filter replacement will not be an issue for you.

Filter Replacement Process
The filter Replacement of this Under sink water system is a piece of cake.

Let’s have a quick look at the filter replacement process

  • Lift-filter, Press button
  • Pull filter down
  • Remove Cap from the new filter
  • Push in the new filter

This undersink osmosis system has an LED light that indicates the time when filters need to be replaced. TDS meter is also an important tool to check when filter replacement is required.

The Standard lifespan told by the manufacturer is below. Although, the lifespan of filters also gets affected by the quality of feed water.

  • Filter 1 & 2 has to be replaced after 6 months
  • Filter 3 has a duration of 2-5 years
  • Filter 4 has to be replaced after 1 year

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What’s more?


unlike other RO systems, it is one of the affordable systems that we have previously reviewed. Both the initial cost and the maintenance cost is reasonable. They had set the cost according to the feature of the system.

High-Quality Components

The quality of components impacts the maintenance cost. All the components are certified, which ensures that you will not busy all the time changing filters and fixing leakages or damages.

Shut off valve

Watts Premier RO pure 4-stage system has a shut-off valve to avoid water wastage. It automatically stops the water flow when the storage tank is full. You don’t have to monitor the water flow or storage tank.


This system has the 3 Year limited warranty. It indicates the confidence of the manufacturer in the quality. You can consider it the best risk-free investment in your kitchen & health.

Better than bottled water 

You will have a minor water filtration plant right in your kitchen. You don’t have to go after bottled water after having this system. Watts premier knocks down the use of bottled water from many customers’ homes.

Satisfied Customers

Customers are too much satisfied. They are appreciating the performance of this system out there on Amazon. Few may have a little bit of confusion and the problem with the system. But those problems can be solved within no time after doing some research. 

Few customers are giving it negative feedback because it makes a little bit sound during operation.

But i don’t think it’s a deal breaker. Does it?

  • Taste better than Bottled water
  • Premium Quality Components
  • Ease of Installation
  • Quick and relatively easier filter replacement
  • Does not consume even a single unit of electricity
  • 3 years limited warranty
  • Affordable filters
  • Faucet installation seems difficult for many users
  • Users claimed it produces little bit sound during operation

Final Thoughts

This undersink reverse osmosis system ensures that you will have the value for which you have paid. Watts premier does not have the advanced stages of filtration, that’s why It might not work better with the well-sourced water.

Although, it has all the basic features to serve you in a better manner. It is capable of producing fresh taste purified water for you. The system is more suitable for medium and small-sized families with municipal water. 

The cost of this RO water system does make a dent in your pocket. You will forget about the bottled water after having this system. 

It is recommended due to its competency, affordability, design, high-quality components, and efficiency.

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Similar Products

It’s not mandatory to have a large number of filtration stages to purify the water completely. There are many 4 Stages reverse osmosis systems are also available that are really worth considering.

Like watts premier, Brondell H2O+ Circle and APEC RO-CTOP Reverse osmosis systems are also removes the contaminants effectively from the water to produce the purified fresh-tasting water.

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