Drinking Water Filter
3-stage Under Counter

The best performing water filter plus an increased capacity pre-filter.

5300 Plus under counter faucet

Get 44% faster water flow plus 200 more gallon capacity
& Bluetooth filter tracking! Shop Now

Select a faucet finish: Brushed Nickel
  • all-metal brushed nickel faucet
  • all-metal chrome faucet
  • oil rubbed bronze faucet
3-Stage Under Counter Water Filter - Brushed Nickel is rated 4.6 out of 5 by 1605.
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50% OFF 3-STAGE UNDER COUNTER SYSTEMS until Oct 14
  • MSRP: 285.70
  • Sale: 142.85

Save 50% + free shipping with Water for Life $142.85

Questions? We can help

  • 866-662-6885
  • MON–FRI: 8AM–7PM CDT
  • SAT: 9AM–5PM CDT

Whole Health

Ultimate Purity*

Instantly transform ordinary tap water into clean, extraordinary water.

NSF Certified Claryum® filtration technology independently tested and proven to remove over 97% of chlorine and chloramines. Also reduces:

  • Heavy metals like lead and mercury
  • Chlorine resistant cysts like giardia and cryptosporidium
  • Organic chemicals like herbicides, pesticides and VOCs
  • Pharmaceuticals like estrone and ibuprofen

For a complete list of contaminants reduced please see our Performance Data Sheet.

Aquasana filters 10 times more contaminants

Whole Health

Ultra Delicious

Claryum®'s selective filtration technology retains naturally occurring beneficial minerals in your water like Calcium, Potassium and Magnesium for healthier, more delicious water!

Whole Health

Eco Friendly

Designed with the environment in mind! Intelligent system design reduces plastic waste by minimizing disposable plastic parts.

Pure Performance

Claryum® Technology

Activated Carbon Reduces pharmaceuticals, herbicides, pesticides, VOCs and MTBE.

Catalytic Carbon Targets chlorine and chloramines.

Ion-Exchange Filters heavy metals like lead and mercury.

Absolute Sub-Micron Mechanical Filtration Captures asbestos and chlorine resistant cysts like cryptosporidium and giardia.

The result: 10x more contaminants reduced than the leading pitcher plus healthy minerals retained for purely delicious filtered water.

Pure Performance

Easiest filter Replacement

Replacements engineered for ease. No need to disconnect hoses or water lines. Eco-friendly filter housing easily twists off so replacing your filters is a snap!

Pure Performance

Convenience & Value

Fewer filter replacements. More clean, great-tasting water.

One Aquasana Claryum® filter gives you 15x the capacity of the leading gravity-based pitcher at only 9¢ per gallon with Water for Life.

Pure Performance

Increase Performance

Extend the life of your system. Improve effectiveness.

Three Stage System features a 20 micron pre-filter to capture rust, sediment and silt that can clog your system. Extends filter life capacity to 600 gallons!

Pure Performance

A Smarter System

The Aquasana AQ-5300 alerts you when it's time to change your filters. No more guessing if and when you need to replace your old filters.

Pure Performance

Stylish
Designer Faucet

Match your kitchen d├ęcor with a designer faucet featuring all metal construction.

How It Works

Superior Filtration

Selective Claryum® Filtration

Reduces 77 contaminants while retaining beneficial minerals for optimal hydration.

Easy to install, replace & maintain

Filter lasts up to 6 months and features easy twist-off design.

certified by NSF

NSF Certified

Full system tested and certified to NSF/ANSI Standards 42, 53, 401 + P473 for the claims specified on the Performance Data Sheet.

  • 600 gallons
  • 6 month filter life
  • 1 year warranty
  • 90 day guarantee

Help & Support

Video Help

  • How to install the Claryum 3-stage water filter
  • How to replace the AQ-5300-R under counter filters

Installing the 3-stage under counter system

Replacing the 3 filters in the AQ-5300

Learn More

Read the Reviews

Rated 5 out of 5 by from Great replacement for older unit Replacrd an old 2 stage GE unit. This one gives clear, clean results!
Date published: 2019-10-01
Rated 5 out of 5 by from Great tasting water We really enjoy our new water filter. The water tastes great and it's wonderful to have the dedicated faucet for our filtered water. It looks so nice. We had a one filter on the counter filter previously. It was unsightly and awkward to use. Knowing now that our drinking water is removing so many more contaminants gives us peace of mind. We are no longer buying bottled water. YAY!
Date published: 2019-09-08
Rated 5 out of 5 by from Overall satisfaction with system So, the system is going ok. My husband installed it in one afternoon. The water tastes good and has no smell.
Date published: 2019-08-22
Rated 5 out of 5 by from Easy install Easy install, removed bad taste and odor from our sub-division well(s).
Date published: 2019-08-21
Rated 5 out of 5 by from Positive Impression so far The installation was straight forward. I needed to make a small mounting plate for the sink since the hole was larger than 1 inch to fit the faucet but that was really no big deal. Everything else went as described in the instructions. So far the system seems to be working fine. The flow is a little slow, but that's to be expected since the water has to work itself through the filtering system.
Date published: 2019-08-08
Rated 5 out of 5 by from So far it is great! Water is very clean tasting, no odor. It gives me peace of mind. We had a plumber install it for us.
Date published: 2019-08-07
Rated 5 out of 5 by from Filter was as advertized My three stage filter was as advertised, unit installed easily and has provided good tasting water. No more bottled water and bagged ice.
Date published: 2019-07-28
Rated 5 out of 5 by from Under-sink water filter I am so happy to have the under-sink water filter in our master bathroom. It is great to be able to drink water, brush teeth, use the water pik all with clean filtered water. I am very happy with this filter.
Date published: 2019-07-20
Rated 5 out of 5 by from Like the looks ...works well Like new filter looks along with knowledge contaminates are being removed
Date published: 2019-07-17
Rated 5 out of 5 by from Excellent product We love the 3 stage under counter water system. It was easy to install. The water tastes clean and delicious now. We left the filtered water in a pot on the countertop for 3 days to see if it changes the taste - nothing happen, still tasted clean and delicious. We recommended this system already to family and friends.
Date published: 2019-04-13
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Learn More

Aquasana FAQs

  1. Do I have to pay for a plumber to install the system?

    Our under counter drinking water filter systems are very easy to install, and it only takes a few minutes to do; no plumber is necessary. If you have any questions or need assistance, our technical support representatives at 866-662-6885 can walk you through the installation process.

  2. How often do I have to replace the cartridges and how much do they cost?

    We recommend replacing the cartridges after six months (three months for the single-stage system) or the specified gallon capacity to prevent the growth of bacteria in the system. The AQ-5100 Single Stage has a capacity of 200 gallons, the AQ-5200 Two-Stage has a capacity of 500 gallons, the AQ-5300 Three-Stage has a capacity of 600 gallons and the AQ-5300+ Three-Stage has a capacity of 800 gallons. Replacement filters cost $29.99 for the AQ-5100, $59.99 for the AQ-5200, $64.99 for the AQ-5300 or $79.99 for the AQ-5300+, but you can save 15%, get free shipping, and extend your product warranty by signing up for our no-contract auto-ship filter replacement program, Water for Life. The performance indicating device on the AQ-5200, AQ-5300 and AQ-5300+ systems will sound a beeping alarm and flash red when it is time to change your cartridges. The AQ-5300+ also contains Bluetooth connectivity so you can download our iPhone App and get alerts for when it is time to change your cartridges and even order new replacements straight from the App!

  3. Is this purified water?

    No, and actually, purified water is not as healthy as filtered water. Purified water undergoes reverse osmosis or distillation, which strip everything out of your water - not only the contaminants, but also the healthy, natural minerals. Our system uses selective filtration designed to reduce contaminants from the water and leave in the natural healthy minerals like calcium, potassium, and magnesium.

  4. How do I recycle the replacement filters?

    We have designed this system to minimize the environmental impact of our replacement elements, which are over 95% biodegradable carbon. Our company will recycle the filters for you, but we do not cover the shipping cost to return the filters back to us. In reality, the environmental impact of shipping the filters back to us outweighs the good of recycling. To recycle the drinking filters yourself, remove the ends of the filters, recycle the plastic parts (which are appropriately numbered) and put the carbon either in your compost pile or garden (carbon is good for plant life), or just throw it out (since the carbon degrades quickly, and is a positive component in a landfill).

  5. I'm a renter, so I can't drill or modify the plumbing. What should I do?

    To install an under counter system, you can remove the existing sprayer or soap dispenser on your sink and install our faucet in its place. This option will not damage or permanently modify your plumbing. When you move out, you can easily remove the system and reconnect your plumbing back to normal. If you do not have an existing hole in your sink from a sprayer or soap dispenser, we also have a countertop drinking water filter that conveniently screws on to most kitchen faucets.

  6. What is the size of the brass T-fitting for under counter and premium under counter unit?

    The most common size is 3/8" which originally comes with the system purchase. In rare cases some customers may need a 1/2" T-fitting which is sold separately and is available for purchase through technical support.

  7. What size hole do I need in my sink for the under counter and premium under counter systems?

    The faucet that is included with our systems requires a 1/2" hole.

  8. What does TDS mean?

    TDS is the acronym for Total Dissolved Solids, the amount of dissolved minerals and metals present in water. TDS meters tell you the concentration of dissolved minerals and metals, but are not an accurate measurement for contamination. Aquasana products reduce and remove harmful TDS like lead, but selectively retain or replace healthy dissolved solids like calcium, magnesium, and potassium.

  9. What is BPA? And why are people concerned about it?

    BPA stands for Bisphenol-A, a contaminant found in most plastics. BPA can adversely affect your health if consumed at high levels. Aquasana drinking systems do not contain BPA, and our filtration process reduces existing BPA.

  10. Does having hard water mean it is contaminated?

    Hard water is more of a nuisance than a health risk, and is not necessarily contaminated. Most water sources in the USA are considered hard. Hard water is generally safe to drink, after it has been properly treated.

  11. What is soft water, and is it safe to drink?

    Having soft water just means you have a lower concentration of dissolved minerals in the water (primarily calcium and magnesium). Soft water does not mean clean water. Your water can be soft and still contain contaminants.

  12. What is selective filtration, and how do Aquasana systems filter drinking water?

    Selective filtration is the process of sub-micron filtration, micron filtration, adsorption and ion exchange, all of which selectively reduces chemicals, heavy particulates and most dangerous heavy metals from the water while maintaining healthy minerals like calcium, magnesium and potassium.

  13. What is the difference between the single-stage, 2-stage and 3-stage under counter systems?

    All of our drinking water systems use the same Aquasana Claryum® filtration technology. The single-stage system lasts 6 months or 200 gallons before the cartridges need to be replaced. Our 2- Stage system has a higher capacity than the single-stage, giving you 6 months or 500 gallons of clean, filtered water. The 3-Stage system includes a 20 micron pre-filter before the two Aquasana Claryum® filters. This pre-filter increases the capacity of the system from 500 gallons to 600 gallons. In addition, it improves flow rate in high sediment areas. The 3-Stage Max Flow system adds even more capacity to 800 gallons, a 44% increase in flow rate at .72 gallons per minute and Bluetooth connectivity for filter tracking.

  14. I have an existing side faucet from a previous system. Can I use that with my new Aquasana water filter?

    We recommend that you use the faucet provided. We have extensively tested the system with the faucets included. The faucets are NSF Certified to have no lead content. In addition, they will not impart any unwanted chemicals into your water. If you choose to use another faucet, we recommend that you have a plumber install the system to ensure no leakage occurs. We also recommend that you install an NSF Certified faucet to ensure the health benefits of your new Aquasana water filter.

Learn More

User Q & A

How often do the filters need to be replaced?

Asked by: Walk
3-Stage filters should be replaced every 6 months or 600 gallons.
Answered by: Aquasana Service Team
Date published: 2018-10-03

Every time we turn on the faucet, is the water OK for consumption immediately or we have to let it run for a few seconds? Thanks.

Asked by: NewUser
When you initially install your filters, we recommend a 10-minute purge to flush any excess carbon and potassium. Other than that, it is not necessary. Mostly, it is just preference.
Answered by: Aquasana Service Team
Date published: 2018-10-02

I am interested in buying the under-sink filtration system but do not have a hole in the sink for a faucet. If I drill a hole for your faucet, what size and shape (circular, elliptical?) should it be? Thanks, JJ California.

Asked by: JJ California
The faucet may be mounted on the sink using an existing circular hole for a sprayer nozzle or soap dispenser, or by drilling a hole at least 1/2” in diameter. Be sure the location of the faucet allows the spout to extend slightly past the edge of the sink. Note: we recommend enlisting the services of an approved or certified professional if drilling is required.
Answered by: Aquasana Service Team
Date published: 2018-10-02

What are the dimensions of the unit Under sink MSRP

Asked by: Marg
The 3-stage Under Counter system measurements are as follows: Height: 9" Width: 12" Depth: 4.25"
Answered by: Aquasana Service Team
Date published: 2019-03-19

Does this filter remove PFAS?

Asked by: Kimberleelee
Yes. All of our drinking systems are NSF certified P475 for the reduction of PFA, PFOA, and PFOS (PFC).
Answered by: Aquasana Service Team
Date published: 2019-08-30

Does the water temperature come out room temperature or chilled?

Asked by: LeeAnn
Thank you for your inquiry. Aquasana systems have no effect on the temperature of your water.
Answered by: Aquasana Service Team
Date published: 2018-09-27

How much space is needed under the sink to install this?

Asked by: ting_squared
Thank you for your inquiry. The 3-stage system measures 9"H x 12"W x 4.25" D
Answered by: Aquasana Service Team
Date published: 2018-09-25

When it starts beeping, what does this mean?

Asked by: Chad1971
The beeping you are hearing is the indicator that it is time to change your filters. You should also replace the battery that is included with your replacemnt filters. Please refer to your Owner's manual for proper installation.
Answered by: Aquasana Service Team
Date published: 2018-09-25

Is there a way to test the alarm?  I don't think mine is working.  When I install the battery I don't hear the five beeps that should be expected.  I checked the voltage of the battery and it is reading 3.4 volts, so the battery isn't dead. 

Asked by: Lou D.
Thank you for your inquiry. The battery is a standard Lithium CR2450 3V battery available at your local store. You may also want to ensure the battery is inserted correctly. Try flipping it over. The writing on the battery should be facing the wall. Refer to the photo below. If you need further assistance, please call 866.662.6885 or e-mail support@aquasana.com
Answered by: Aquasana Service Team
Date published: 2018-10-14

I have a granite countertop without an extra hole. Is there any way to attach this to an existing faucet? Or, do you you have another suggestion? Does this filter out fluoride?

Asked by: Mezzo
Thank you for your inquory. The system coes with a small cold water faucet to be installed with the syste. You may use the existing extra hole you have. It is not deisgned to be used with the main faucet, as hot water should not be filtered through the system. It degrades the carbon at an accelerated rate. Tihe 3-stage system does not remove fluoride. However our Reverse Osmosis system does, and has a similar setup. You can review the RO system at: https://www.aquasana.com/drinking-water-filter-systems/reverse-osmosis-claryum I have also attached a photo of the setup so you can get an idea, just click on the photo below. If you have any questions, please e-mail sales@aquasana.com
Answered by: Aquasana Service Team
Date published: 2018-09-21

Hello, Is it safe for the water line to run behind the range so it can reach the ice maker within the refrigerator?

Asked by: mlouie
Thank you for your inquiry. While we believe it should be okay, We highly recommend you inquire with a licensed plumber. Let us know if you have any questions!
Answered by: Aquasana Service Team
Date published: 2018-09-18

How much of chlorine and fluorine does this remove?

Asked by: RJ....
Thank you for your interest in Aquasana. The 3-stage system is certified to remove more than 97% of chlorine in your drinking water. Flourine salt, or flouride, is only removed through our Reverse Osmosis system at: https://www.aquasana.com/drinking-water-filter-systems/reverse-osmosis-claryum
Answered by: Aquasana Service Team
Date published: 2018-09-18

Is this water Ionized as well??

Asked by: Zelly
Thank you for your interest in Aquasana. Our products do not ionize the water.
Answered by: Aquasana Service Team
Date published: 2018-09-18

Does this faucet allow for hot and cold water? Also, can I replace existing kitchen faucet?

Asked by: apand3
The faucet is designed for cold water only and hot water can degrade the carbon. Our faucets are specifically tested and approved by the NSF for use with our filtration systems. Because your faucet has not been tested and certified with our system, we cannot recommend it, nor can we assist in the installation. You may find the installation manual at http://cdn.aquasana.com/assets/AQ-5100-5200-5300_Install.pdf
Answered by: Aquasana Service Team
Date published: 2018-08-29

How will I know when to change the filters? Will the unit continue to function when new filters are needed?

Asked by: JimB
Your system includes an alarm that will beep when it is time to change your filters. We also include a new alarm battery with every replacement filter shipment.
Answered by: Aquasana Service Team
Date published: 2018-08-29

What size hole is required in countertop for AQ-5300 model spout? Thank you for your reply. Lynn

Asked by: Curious Lynn
We recommend a minmum of 0.5" and not to exceed 1"
Answered by: Aquasana Service Team
Date published: 2018-08-28

Hello, I would like to know if this water system filters flouride? And does this fitler out Iron from the water or leave it in tact? Thanks.

Asked by: Britttrum
To remove fluoride and iron, we recommend our Reverse Osmosis system at https://www.aquasana.com/drinking-water-filter-systems/reverse-osmosis-claryum
Answered by: Aquasana Service Team
Date published: 2018-08-28

Every time we turn on the faucet, is the water OK for consumption immediately or we have to let it run for a few seconds? I remembered that for another brand, there is a suggestion to wait for 5 seconds. Thanks.

Asked by: NewUser
Ours is perfect for consumption immediately.  As we get close to the time to change the filter (about every 4 -5 months) the flow is somewhat less strong and steady, but there are no particles in it at all.
Answered by: Melissa in Houston
Date published: 2019-08-30

I drink about 30 liters per month, I'm always away from home. I calculated about 18 months. How to know that I am drinking filtered water after 1 year? If I replace the battery, does the sequence continue or does it restart?

Asked by: Beto
We recommed changing the fiters on the 3-Stage system every six months. We base our estimates and requirements on the testing done by the NSF. In the case of our filtration systems, it is not always necessarily the amount of water that has passed through the system, but the amount of time that the filters have been in contact with Water. Keep in mind that while you may be using a minimal amount of water, the filters are constantly soaking in the water, waiting for a valve to open, and the water to resume flowing. We make suggestions based on the safest and healthiest way to maintain our systems. Once the filter starts to degrade due to elongated contact with water, you risk bacteria and mold growing inside the filter and the system: Heterotrophs (heterotrophic bacteria) are a group of microorganisms (yeast, molds & bacteria) that use organic carbon as food (as opposed to autotrophs like algae that use sunlight) and are found in every type of water.
Answered by: Aquasana Service Team
Date published: 2019-08-30

Is there an indicator or alarm that says when to change the filters? I am only 1 person, so my usage will be minimal. What is the purpose of the battery?

Asked by: DebD
Yes. I have only changed mine once, but I think when you turn the water off, there is a brief sound. I put a label on mine when I installed it and it was about dead on 6 months. We use it a lot. It's plumbed to our ice maker and our sink, plus I give our three dogs filtered water. Personally, I would not wait longer after 6 months, because I suspect the filtration media may start to break down. Just my opinion.
Answered by: Sphere360
Date published: 2018-08-25

Is there an indicator or alarm that says when to change the filters? I am only 1 person, so my usage will be minimal. What is the purpose of the battery?

Asked by: DebD
When it’s time to change the filter, The indicator flashes red and the alarm chirps whenever u use the water
Answered by: CYMD
Date published: 2018-09-10

We just installed the Aquasana under counter water filter system. When we turn the water on it does not come out in a smooth run. What did we do wrong? Thank you.

Asked by: Chris K.
You need to run the water continuously for a certain amount of time (I think it is in the directions). There are a lot of places where air needs to work itself out. It will get better.
Answered by: joshdchap
Date published: 2019-08-30

What is the cost to replace the 3 filters? For a household of 2 senior adults, approximately how often do the filters need replacing?

Asked by: Hanuman
Filter replacements for the AQ-5300 system are $64.99 MSRP. If you opt into our Water For Life program, we do offer a 15% discount + free shipping, which brings the price down to $55.24. We suggest replacing the filters every 6 months for optimum performance. Thank you, Aquasana Customer Support
Answered by: Aquasana Customer Support
Date published: 2018-08-18

will this filter for p473 standard?

Asked by: andreww
Yes! Aquasana is currently the only water filtration system that is NSF certified for the reduction of PFOA's http://www.nsf.org/newsroom/nsf-international-certifies-first-water-filters-pfoa Thank you, Aquasana Customer Support
Answered by: Aquasana Customer Support
Date published: 2018-08-18

What are the dimensions of the filter unit overall, including the 3 filters?

Asked by: DIYer
Hello! The undercounter part of the AQ-5300 system is system is about 12 inches wide, 4.5 inches deep, and 9 inches from top to bottom, but you will need to allow a few inches underneath so that you can access and change the filters. Thank you, Aquasana Customer Support
Answered by: Aquasana Customer Support
Date published: 2019-06-18

How tall is the faucet?

Asked by: Izzi
It is 8-3/4" tall @ the highest point of the spout
Answered by: lilysopa
Date published: 2018-06-09

We already have a brand new expensive faucet we can’t return. Can the filter system be used with other faucets?

Asked by: Jessnyc1
The water filter system comes with it's own faucet. You need both
Answered by: organic shopper
Date published: 2018-06-07

How high is the faucet?

Asked by: Howhigh
The faucet is 8" from the base to the high point of the faucet. Thank you, Aquasana Customer Support
Answered by: Aquasana Customer Support
Date published: 2018-06-02

Does the filters remove iron?

Asked by: BCSC
Thank you for your interest in Aquasana! While this system will certainly help with reduction of heavy metals such as iron, it is not NSF certified to do so, as the level of reduction is not high enough to meet the certification standards. Thank you, Aquasana Customer Support
Answered by: Aquasana Customer Support
Date published: 2018-06-02

We have the 3-stage under the counter filter. We just moved into a house with well water and a water softener. Will our Aquasana filter still be effective on the softened water for drinking? Also, will it improve the sulfur smell at all? Thank you!

Asked by: lovengratitude
Hello! While the system will still remove contaminants from your well water, we typically do not recommend this product for well water. Additionally, this system will not remove the salt added to your water by the softening system. I would recommend our Reverse Osmosis system as it WILL remove the excess salt from your water as well as offering additional contaminant reduction better suited for well water. https://www.aquasana.com/drinking-water-filter-systems/reverse-osmosis-claryum Thank you, Aquasana Customer Support
Answered by: Aquasana Customer Support
Date published: 2018-06-05
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