Water Filters

Aquasana AQ-4000W Countertop Drinking Water Filter Review

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Who doesn’t want to drink purified water without the stress of any health risks? If you are on a continuous search for a reliable countertop water filter system, then you must have come across Aquasana filters.

Aquasana is a renowned company proving its worth around the globe with its highly efficient and credible products. Everyone is concerned about the health of their family as it depends highly on the quality of water we drink.

Water is used not only for drinking, but for our daily needs like preparing baby food, cooking, brewing coffee, and making beverages. With such widespread use, we can never estimate the number of contaminants we can intake through dirty and impure water.

Aquasana has taken a step ahead on its mission to help its customers drink clean and stay worry- free by introducing the Aquasana AQ-4000 countertop filter. There has been a frequent increase in cases of diarrhea, digestive issues, and other health-related problems.

We have tested and researched the Aq-4000 and the tests resulted that the people using this water filter have not yet reported any issue or health concern. We know that only words cannot prove the credibility of Aquasana Aq-4000 to make you bring it home.

For that, we have done extensive research and rigorous testing on the filtration system after which we have compiled this detailed review for you.

We have divided this review into different parts including the key specifications, possible pros and cons, major features, major drawbacks, and what the general public thinks about the product. A detailed buying guide is also crafted for your ease to choose the best.

Aquasana Aq-40000 Review

Get extraordinary in an ordinary price by bringing home the most economical solution to all your water purification needs. Aquasana Aq-4000 is the countertop water filter that will never disappoint you in terms of quality and longevity.

The filter has more to offer than it promises and this is why it has the hearts of its users. Let’s see what’s so special about this filter:


Aquasana Aq-40000  - Key Features
836 Reviews
Aquasana Aq-40000 - Key Features
  • Removes over 97% of chlorine and reduces 76 other contaminants - NSF certified to remove...
  • No waste water or harmful contaminants added to your drinking water during the filtration...


Certified by NSF/ANSI Standard 42, NSF/ANSI Standard 53, NSF/ANSI Standard 401, NSF/ANSI Standard P473 | 40-90 Degrees Fahrenheit | 0.4 GPM | removes 97.4 of chlorine, 99.95 of particulates and cyst live, cryptosporidium and giardia, 96.6% of mercury 99.35 of lead 81.8% of methyl tertiary butyl ether (MTBE), 99.0% of turbidity, 99.475 of volatile organic compounds (VOCs) by surrogate, and 99.0% of asbestos | 2-stage filtration with 4 steps | 1-year warranty
  • Optimal hydration
  • Economical
  • Easy installation and set up
  • Convenient to use
  • Value of money
  • Fully tested and certified
  • Removes 76+ contaminants
  • Easy replacements
  • No water wastage
  • Retains healthy minerals
  • Lightweight and portable
  • 90 days money-back guarantee
  • Not ideal for well water
  • Expensive maintenance

Key Feature of Aquasana Aq-40000

Aquasana Aq-4000 water filter is the best thing you will read about today. This countertop filter is known for its portability, ease of use, and efficient filtration.

The filter is a small lightweight unit that is simply designed to enhance your drinking experience and provide better hydration to your body. With this filter attached to your faucet, you will feel a clear difference in the quality and taste of the water.

The filter is capable of turning contaminated water into spring water with its high-end technology. To provide you with a deeper insight into the product, we have categorized the performance of the filter according to the main features detailed below.

Filtration Quality

Every filter is designed for water filtration, but not all the filters are designed equally. Only a few of them reach such perfection to purify the water to the core. Aquasana Aq-4000 water filter is one among them.

The filter has such a powerful tendency to turn even to most contaminated water into crystal clear. Not only does it improve the taste, color, and odor, but it also removes more than 76 contaminants from the water.

The system includes a 2-stage water filter that further consists of 4 filtration steps with the help of Claryum technology. The four steps include:

  1. Activated Carbon: the activated carbon removes pesticides and other organic chemicals.
  2. Catalytic Carbon: reduces chlorine and chloramines up to 98%
  3. Ion-Exchange: removes lead and mercury
  4. Sub-Micron Mechanical Filtration: cyst, asbestos, and leftover chlorine particles are captured

Filter Life And Capacity

When we talk about the filter life and capacity of the Aquasana Aq-4000 filter, it has some surprising features in it. The filter doesn’t require a specific period of time to be replaced.

You have to replace the filter once you have used 450 gallons of filter water. This makes the filter more reliable because the quality of filtration will remain the same for 450 gallons without any dropping in the flow rate or else. The average usage time for 450 gallons is estimated to be 6 months.

The filter can effectively remove 97.4 of chlorine, 99.95 of particulates and cyst live, cryptosporidium and giardia, 96.6% of mercury 99.35 of lead 81.8% of methyl tertiary butyl ether (MTBE), 99.0% of turbidity, 99.475 of volatile organic compounds (VOCs) by surrogate, and 99.0% of asbestos along with 76 other contaminants.

Flow Rate

While the flow rate of this water filter is slow, it can easily meet your daily water requirements. The average flow rate for any filter is 0.5GPM whereas Aq-4000 has a flow rate of 0.4GPM.

You don’t need to worry about it a lot because the filter will be attached to your faucet and will balance its flow so that you won’t need to wait longer. The best part is that not a single gallon of water is wasted during the filtration process that makes you save on your water bills as well.

Installation & Maintenance

Because it is a countertop filter that attaches to your faucet, you don’t need to put a lot of effort into its installation and attachment. The system comes with everything you need. It requires no additional tools or a plumber.

The unit includes a faucet-Attached Diverter, Filter Elements, Countertop Filter, and adapters for 13/16” and 15/16” faucet. Simply screw the filter along with the faucet and run water through it.

You can also read the user instruction manual or watch the installation tutorials. As for the maintenance, the replacement cartridge for this filter is quite expensive that might concern you a bit.

No other maintenance is needed apart from the cartridge replacement on time.


It is a general perception that the filters that are certified and approved are more reliable than the ones that aren’t. The certifications of a filter prove that it is tested by higher water quality authorities. Aq-4000 fulfills the criteria of a dependable water filter after getting all the certifications from NSF.

The system is fully certified according to the  NSF/ANSI Standards 42, 53, 401 + P473 to reduce 77 contaminants including lead, mercury, herbicides, pesticides, pharmaceuticals, and more. The test results of the filter are also available on their website that makes it unbeatable.


What is better than getting a money-back guarantee along with a warranty? Well, the Aquasana Aq-4000 countertop water filter gives you with this plus.

The filter is backed up with a 1-year limited warranty along with 99 days money-back guarantee so that you can test it to your satisfaction.

This offer is great for you if you happen to have previous experience of receiving a false delivery of broken products through the mail. Aquasana takes full responsibility for their products and knows how to make the customers happy.


While there are a lot of breathtaking features we have been discussing about, we can’t deny the fact that nothing is perfect. Just like that, the Aq-4000 filter also has some limitations and drawbacks you should know about.

Firstly, the maintenance cost is way too much. If you can afford to spend a heavy amount every six months on your filter, you are good to go. However, people with tight budgets can give it a second thought.

Secondly, it doesn’t work as effectively with well water as it does with tap water. So, if you have well water coming through your pipelines, this one might not be the best choice.

What Customers Are Saying

The only problem that some customers have faced is with the replacement cost and flow rate. Other than that, people who have used this filter for once have made this their permanent solution to water filtration.

Some have said that it is a “little slow to dispense” but works as it should. Some have reviewed that the “filter works great” for as long as it is timely replaced. The customer satisfaction rate may not be impressive on this one, but you should try before making up your mind.

People are loving the taste of their water and the fact that it is easy to install and
use. Its portability allows them to use it with any faucet in their house to get clean water for everything.

What We Liked The Most

Almost everything about this water filter is to die for. However, our experts are really impressed with the quality of filtration that this little portable system is able to provide.

This filter is unbeatable and unsurpassed when it comes to the filtration technique and capabilities that it has.

There are a lot of more advanced filters in the market, but you won’t find one like the Aquasana Aq-4000. This filter purifies your water, improves the taste, reduces the bad odors, andeliminates more than 76 harmful contaminants including lead, mercury, turbidity, and other VOCs.

Try it for yourself and you will clearly see the difference in the quality of the water filtered with Aq-4000.

Buying Guide for Countertop Water Filter

We have carefully compiled up a comprehensive buying guide so that you will make an informed and confident decision while buying a water filter for your home.

Why Do You Need A Filter

The first thing to determine is the need of buying a water filter. Ask yourself why you need one. What made you think that your water quality is poor and needs to be improved.

No doubt that the answer would be simple. Every household needs a water filter because no matter how clean the water looks, you never know how many contaminants are floating in it.

There are hundreds of chemicals, sediments, and contaminants that aren’t visible to naked eyes but their presence cannot be denied. A water filter will keep you safe from getting sick by drinking dirty and contagious water.

Countertop Or Faucet Filter

We will highly recommend that you look up for countertop water filters instead of faucet mount filters.

The main reason is that countertop filters come with a diverter that allows you to switch between filtered and unfiltered water. Whereas faucet mount filters need to be removed every time you need to switch to unfiltered water.

Another reason is that they are portable and you can attach them with any of your home faucets with the right adapters. The only thing you need to take care of is to avoid using too hot water for countertop filters.

Do Your Research

Before you start making up your mind to buy a water filter for your kitchen countertop, keep some options to choose from.

Never settle for anything less just by looking up for 2 to 3 products. You will think that it will save you time, but you’ll only regret it later on. Do extensive research even if you have listed down 2 to 3 products.

Ask people about their experience with the filter, go to their website, and check the product rating, read customer reviews, check out details about the features and other specifications. Doing thorough research on each product will help you greatly in making the right choice.

Filter Life

The maximum average life of a countertop filter is 3 to 6 months. Some of the best ones can also last for a year. So, if you are not the type of person to constantly maintain your filter, go for the highest filter life.

Make sure that the filter you are choosing has a proper replacement indicator so that you know when the filter life has reached its limit.

Easy Replacement Should Be Focused

The next important thing that should never be compromised is the setup and replacement of the filter. No one has the time to waste a whole day just to replace a filter cartridge. Not only that but also consider the ease of availability of the cartridges in the market.

What Does It Remove

Not every filter removes everything. Some water filters are designed for chlorine reduction, fluoride removal, or lead removal. Only a few water filters have a wide range of contaminant removal abilities.

The best ones can also remove bacteria, viruses, and other harmful chemicals. You should always be careful about choosing a filter according to your filtration requirements.

If you buy a filter that doesn’t remove lead and you want lead removal filter, it is of no use for you.

Warranty & Certifications

Always ask for the manufacturer’s warranty and check the proof of proper certifications and test results approved by renowned authorities like NSF, ANSI, or WQA. A 1-year warranty is an average warranty that comes with a countertop water filter.

However, some of the best ones also offer satisfaction trials and money-back guarantees along with the warranty.


Last but not the least; you must consider your budget before buying a water filter. Countertop filters come in a wide price range. You can easily get a nicely working and reliable filter even if you are on a tight budget.

All you need to do is search according to all the considerations we have talked about and you’ll ever be disappointed.

FAQS (Frequently Asked Questions) for Aquasana Aq-40000

  • How to know when the filter needs replacement?

You don’t need to know that because the filter will provide you the same quality water for 6 months. Just not the time and replace it after every 6 months of 450 gallons.

  • What are the dimensions of this filter?

The Aq-4000 is measured to be 12 x 7 x 4 inches. It is quite small and lightweight.

  • Does it remove fluoride?

No, unfortunately, you will have to buy an RO filter for the removal of fluoride.

  • Can I switch from filtered to unfiltered water with this one?

Yes, the diverter on the valve helps you to switch between filtered and unfiltered water.

Installation Guide Aquasana AQ-4000W


We hope that this detailed version of the Aquasana Aq-4000 review has provided you with every bit of factual and genuine information you needed to make up your mind.

This water filter is not only easy on the pocket but also gives you great convenience in drinking crystal clear water; just like you expect.

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Last update on 2023-01-12 at 10:25 / Affiliate links / Images from Amazon Product Advertising API

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