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 gallons of filter life capacity! 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 4.5 out of 5 by 1663.
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$11499 3-STAGE UNDER COUNTER SYSTEMS - limited time!
  • MSRP: 285.70
  • Sale: 114.99

Save 60% + free shipping with Water for Life $114.99

Questions? We can help

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

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 I purchased the standard 3-Stage Filter System In early November, I purchased the 3-Stage Water Filter system. It took me approximately 1-½ hours from start to finish. Upon completion, I removed the plastic insert to start the system and turned on the water supply. Amazingly, there were no water leaks. I flushed the system for 10 minutes, as required, and afterwards, had my first glass of filtered water. The water was delicious! I couldn't have been more satisfied. I unequivocally recommend the Aquasana filter system I have purchased, to anyone wanting wanting an easy-to-install, inexpensive, under-counter system.
Date published: 2020-11-19
Rated 5 out of 5 by from Very effective unit and simple installation All materials needed for installation in the box. Supply your own drill for the counter hole, and in it goes. Took water with a heavy chlorine oder and took it out, no taste or order
Date published: 2020-10-28
Rated 5 out of 5 by from Great space saver. Great space saver and it will filter the water also....
Date published: 2020-10-24
Rated 5 out of 5 by from Can drink our water again So nice to have drinking water again. Our water was terrible had to buy bottled water. We had so much calcium in our water we couldn’t use the ice or drink the water. After installing the filters its like night and day, great drinking water and crystal clear ice. No more bottled water
Date published: 2020-10-15
Rated 5 out of 5 by from Love it Love it....love it.... Live in Florida everyone should have this on their sink. Thank you
Date published: 2020-10-15
Rated 5 out of 5 by from My overall impression of your product It was very easy to install! The water taste great! We now have the peace of mind we are drinking clean water! And we don't have to buy bottled water anymore!
Date published: 2020-10-15
Rated 5 out of 5 by from Easy to use and install. Tastes great! The installation process was simple! The water tastes great! The spout makes is convenient to use! Really glad to got it! We have not experienced the "refill process" yet. I am hoping that goes as smoothly.
Date published: 2020-10-08
Rated 5 out of 5 by from Very good quality filtered water We are enjoying our filtered water very much and use filtered water every day. My husband was able to install the system on a Sunday afternoon. We are definitely glad we got this system. So glad to not have to buy bottled water anymore.
Date published: 2020-10-04
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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.

  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 for 800 gallons of filter life and a 44% increase in flow rate at .72 gallons per minute.

  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

Dear Aquasana support, Is it necessary  to shut off water supply for filter replacement? This is for 5300 system.  Thank you in advance. 

Asked by: Artak
Hello, Thank you for your question. Yes. It is absolutely necessary to shut off the cold water valve under the kitchen sink before replacing the filters. This will release the pressure from the system by turning on the filtration system faucet. Once there is no longer any water coming from the filtration system faucet, you will be ready to change the filters If you have any other questions or concerns, you may also contact us directly at 866-662-6885, Monday thru Friday from 8 am-6 pm CST, and weekends from 9 am-5 pm CST. -Aquasana
Answered by: -ACS
Date published: 2020-11-30

Is it possible to buy just the cartridge sump, mine is cracked in the bottom. I do not see anywhere on the page where can I get the sump only.

Asked by: Anibal
Thank you, Hanna, is good to know that you replaced yours. I just wrote to them, we'll see if they can do the same for me.
Answered by: Anibal
Date published: 2020-11-25

If I am on a well, and I use a water softener that I put salt in, will this thing still help my water if I am on a well

Asked by: Colls
Yes, the water will taste better.
Answered by: Old pipefitter.
Date published: 2020-11-24

I just installed the three stage unit using the included faucet. The flow rate is too slow. Is there anyway to increase the flow rate?

Asked by: Sightseerrv
Hello, Thank you for contacting us. The issue could be the sump is not fully turned into the correct position. Step 1 Turn off the main water supply underneath the sink Step 2 remove sump from the manifold and reconnect Step 3 Ensure that the connection points align correctly and turn the sump from left to right until it stops Step 4 If the sump is not locked in the correct position, it can slow the flow of your system. Step 5 once re-threaded and re-attached, test by turning the water supply on If this does not help please contact us at 866-662-6885 and we will be happy to help further assist. Thank you, Aquasana Customer Support
Answered by: Aquasana S
Date published: 2020-11-19

I just installed a compact three stage under sink system. Looks goo but the slow rate is very slow. How fast should flow rate be? What could be the problem?

Asked by: PeterD
I do not know of the exact flow rate. However, mine provides a steady stream from the faucet. If I was to guess, I would say 1 gallon per minute. I have had mine for about 4 years and have had no issues. Mine has a T to my refrigerator and to a faucet on my sink. I hope this helps.
Answered by: Sphere360
Date published: 2020-10-21

My son says he sees a cloudiness, are those just the minerals that are being placed back in once the reverse osmosis is complete? It does have a different taste, like it has more minerals.

Asked by: soysegura
Mine did that too for the first few gallons. I’m guessing gasses in the filters themselves that are being cleared out but just guessing. It cleared up soon after I installed it.
Answered by: Steve R
Date published: 2020-10-15

What is the purpose of the 3Volt Lithium battery in the Aquasana AQ-5300R 3-Stage Under Sink...

Asked by: Anonymous
If I remember correctly, there is an audible alarm that sounds when you need to change your filters. This battery powers whatever keeps track of all that.
Answered by: joshdchap
Date published: 2020-10-15

Can the under sink filter be hooked up to the separate faucet and the water line to a refrigerator at the same time?

Asked by: Coleman
Yes, use a T to allow water to your refrigerator and faucet at the same time. I have had mine for about 3 years, it works great.
Answered by: Sphere360
Date published: 2020-09-26
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