Aquasana AQ-4000 Countertop Water Filter Review [2022]

aquasana countertop

Water does wonders for your health. You can’t take the importance of water for granted. While tap water is convenient and easy to access, you can’t expect it to be pure all the time. 

aquasana countertop

Fortunately, there is a way to enjoy clean and pure water: a water filter. Aquasana is an internationally acclaimed name known for providing reliable water filters for the last few years. From their wide variety of products, Aquasana AQ-4000 Countertop Water Filter has earned a distinguished position on the market. 

Aquasana AQ-4000 has been built considering the real problems of customers. The white unit features pleasing aesthetics. Manufacturers claim that it can remove 97% of chlorine along with additional pollutants, making it a cost-effective option. 

Being certified by the NSF, there is no question about its reliability. It is capable of removing heavy metals like mercury and lead, herbicides, and other pollutants from the drinking water. One of the best things is the eco-friendly approach behind its design. Since it requires fewer filter replacements, there is reduced plastic waste. 

The installation is just a breeze, and you won’t require any special tools to fix it on the kitchen sink. So, if you are on a water filter hunt, the Aquasana AQ-4000 Countertop Water Filter is hands down the ideal pick. 

Aquasana - AQ-4000 Filter Key Features

Like any high-end product, Aquasana – AQ-4000 is packed with brilliant features that make it a good choice for household use. We’ve detailed some of its prominent features below:

2 Stage Claryum filtration:

The core task a water filter has to do is filtration. This water uses an advanced filter technology called Claryum technology. The whole process includes two filtration stages to ensure clean water for those who want to enjoy purity. These stages are further divided into four segments:

  1. Activated carbon filter reduces pesticides, herbicides, and other organic chemicals from the water.
  2. Catalytic carbon filtration helps in the removal of chloramines and chlorine up to 97%. These are responsible for unpleasant taste and odor in the drinking water.
  3. The ion exchange technology ensures the removal of heavy metals like mercury and lead.
  4. Finally, the sub-micron filter captures and removes cysts. 


The unit features a durable build that is complemented by a user-friendly design. You can attach it straightaway to the faucet and easily replace the filters whenever required.

NSF certified:

Another remarkable thing about this unit is that it meets NSF standards, which means it not only removes the chlorine from water but also reduces the concentration of potential pollutants. 


A warranty serves as the cherry on the top for customers. This Aquasana water filter is backed by a 90-day money-back guarantee as well as a one-year warranty. This enhances the confidence of customers in this water filter.

Installation instructions:

The package includes an instruction manual to help you with the installation. You can refer to the booklet to know all about maintenance as well as filter changes. 

Ease of use:

This water filter is designed to make installation as easy as possible for users. All you need to do is attach the filter to the kitchen sink using the hose and diverter wall for immediate access to clean water.



aquasana countertop

Being a countertop water filter, the installation does not require a significant amount of time and effort. Still, here is a step-by-step guide to help complete the task for those who are confused.

  1. First, twist off the aerator from the faucet.
  2. Attach the diverter valve after checking that the rubber washer is in place. 
  3. Now, screw the brass adapter using the plastic hex wrench tool, which comes in the package.
  4. Look for two holes at the bottom of the unit and insert the hoses into them.
  5.  Make sure the blue and white tips are inserted in their respective caps.
  6. Now, open the faucet and make sure there is no leak. 
  7. Pull over the diverter pin and allow the unit to flush for at least 10 minutes. 

Maintenance and Care

Maintenance is extremely important to make the most of the water filter and ensure it serves you for a long time. Since the capacity of the filter is 450 gallons, you must replace it once it reaches its limit. While it depends on the gallons you filter in a day, it is recommended to replace the filters every six months. 

You don’t need to call for a professional plumber to replace the filter. Just turn the filter cap, remove the cartridge, and fix the new one. 

Pros and cons of the Aquasana AQ-4000 Countertop Water Filter

Investing in a water filter is crucial, especially for those who are serious about their health and want to enjoy clean water. To help you determine whether it is the right purchase, we’ve listed the pros and cons of the water filter below. 


Impressive flow rate:

One of the major benefits of this filter is its great flow rate. With a flow rate of 0.4 gallons per minute, it is capable of producing 30 gallons of purified water in an hour.


The compact size is the reason why this water filter is extremely portable. You can take it with you anywhere, even if you are moving to a new house, making it a long-term investment.

Easy to install

Since there is no permanent fixture needed, the installation literally takes only five minutes. You can refer to the instruction manual and do it yourself without any problem. 


With a fairly good enough filter capacity, this unit does not require frequent filter replacements, which ultimately reduces plastic waste. This makes it an eco-friendly option. 


Expensive maintenance:

The maintenance of this unit costs much more than other filters on the market. Since cartridges are very expensive, the annual replacement cost can be heavy on the pocket.


Some users complained about the leakage from the bottom of the unit. However, manufacturers compensate for the loss with free replacement parts.

How is Aquasana - AQ-4000 different from Aquasana Active Clean Machine?

Aquasana has introduced many water filters to improve people’s lifestyles. Both the AQ-4000 water filter and the Active Clean machine from Aquasana have their good and bad. While both serve the same purpose – cleaning water – there are many underlying differences. These include: 


One of the major issues with the Aquasana active clean machine is its loud operation. On the other hand, Aquasana AQ-4000 is silent. In fact, you won’t even notice it working! 

Flow Rate:

Another difference between these two units is the flow rate. While the flowrate of Aquasana AQ-4000 is around 0.4 GPM, the Active Clean Machine has a fairly high flow rate of 0.5 GPM. 


The Aquasana Active Clean machine requires filter replacements every three months, even if you don’t use the machine too much. Contrary to this, the filter in AQ-4000 tends to last for at least six months, making it a cost-effective option. 

Where to buy the Aquasana AQ 4000 Countertop Water Filter

Given its features and benefits, the Aquasana AQ-4000 makes for a great option if you want to enjoy clean and pure water. You can buy it from here

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