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Filter Replacement
3-Stage Under Counter Water Filter

Replacement filters for the Aquasana 3-Stage Drinking Water System, Model Number AQ-5300.

5300 water filter

This filter set replaces the filters in the AQ-5300 3-Stage drinking water filtration system.

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  • MSRP: 64.99

Save 15% + free shipping with Water for Life $55.24

Questions? We can help

  • 866-662-6885
  • SAT: 9AM–5PM CDT

Pure Performance

Claryum® Technology

Activated Carbon Reduces organic chemicals like 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 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!

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

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

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Read the Reviews

Rated 5 out of 5 by from greatly improves taste of our water Replacement filters are easy to install and improve water taste
Date published: 2019-06-06
Rated 5 out of 5 by from Easy to install, great product! Every six months I replace the filters easily. Tuck it back in to the corner under the sink. Let the water run to use it on my plants until it’s ready to drink. Water tastes great!
Date published: 2019-03-19
Rated 5 out of 5 by from aq5300 this is a great system this system works really well have had it for aprox 10 years on second one now. mounted it in basement and ran lines up to kitchen, is a lot easier to get at filters to replace them.only problem i have is aftrer 6 to 8 filter changes o rings will not seat and they leak. and they dont have replacement orings
Date published: 2019-03-14
Rated 5 out of 5 by from Filter works great and is easy to maintain. Installation of the new filters was easy. The only problem I had was reaching the filters as the person that installed it originally made it tough to get at. Very nice system.
Date published: 2019-01-10
Rated 5 out of 5 by from Aquasana drinking water filter replaced It’s easy to install and replacement, now I worry free because I sign up for water for life it’s auto to send my house every 6 months and discount $10 off too so I think it’s good for family to have one
Date published: 2019-01-05
Rated 5 out of 5 by from Very efficient. Very efficient and healthy, practical, and nice setup.
Date published: 2018-05-10
Rated 5 out of 5 by from Great tasting Water Love this water system. It doesn't take up allot of room under the sink and the water tastes wonderful. So glad I got it
Date published: 2018-05-08
Rated 5 out of 5 by from Very Pleased We have been very pleased with the Aquasana 3-stage drinking water system and filters. Have used it for your years on a regular basis. We had a plumber install system initially, but I change the filters easily. The taste is great. We sold our house where we had the system; and now we had one installed in the house that we are renting. I do highly recommend the system. Make sure it is installed properly so water flows correctly.
Date published: 2018-05-07
Rated 5 out of 5 by from Good quality The filters are on the expensive side but they do the job the water taste grate
Date published: 2018-05-03
Rated 5 out of 5 by from Great taste, Have been using for several years, love it!! Will continue to do so. Would love to have whole house filter, but can't afford it now.
Date published: 2018-04-11
Rated 5 out of 5 by from Best Tasting Water Ever We moved into a brand new house from a condo where we had the on the counter machine. We had the triple filter installed under the sink in the new house. We just changed filters for the first time. Because of the design it turned out to be very easy and user friendly.
Date published: 2018-03-19
Rated 5 out of 5 by from Great customer service Quick delivery,clean water, taste great, easy to install
Date published: 2018-03-14
Rated 5 out of 5 by from Good Filtering We're pleased with this under the sink system. Although it takes several hours for the water get thru the new filters once changed, it works well afterward. Wish the counter top spicket had a larger hole where the water comes out. Its not much more than a heavy trickle, so filling pots or pet bowls takes some time. The smelly well water has no odor with this system and seems clean. Only takes minutes to change under the sink.
Date published: 2018-03-07
Rated 5 out of 5 by from We love our Aquasana water! Must say this water reminds me of the water I drank as a child living in the mountains of the western part of Canada. Fresh , clean......it is the best water I have drank in 45 years!
Date published: 2018-02-26
Rated 5 out of 5 by from Easy Installation This set was my second and we have gotten used to the fresh coffee on the morning.
Date published: 2018-02-19
Rated 5 out of 5 by from Excellent product After purchasing aquasana had a plumber come, none of the parts fit our system, but the plumber went on how these system don't work that well. Well the results were just as good as the expenesive units. Very pleased with the water filter.
Date published: 2018-02-14
Rated 5 out of 5 by from clean and clear The best water filtering system available. I did the research on several. Regular sink water had a strong lead, clorine , iodine taste. The Aquasana triple filter took away all the bad flavors. Especially noticed how much better the tea and coffee tasted. Great product, Highly recommend it.
Date published: 2018-02-09
Rated 5 out of 5 by from Works well Works well for tea water, kids won't drink any tap water at all anymore.
Date published: 2018-02-09
Rated 5 out of 5 by from easy to install & water tastes great system is easy, very easy to install. water smells good ( no bad odors) and tastes just as good as spring water.
Date published: 2018-02-09
Rated 5 out of 5 by from Great tasting water Second year in use. Great Filtration,easy to install.
Date published: 2018-02-09
Rated 5 out of 5 by from Replacement is so easy! Easy to replace filters. No tools needed Works well
Date published: 2018-02-09
Rated 5 out of 5 by from Works great I can’t believe how great the water tastes now. Not to mention how much more healthful it is. Works great
Date published: 2018-02-09
Rated 5 out of 5 by from Happy With Product We purchased the Aquasana system from amazon last year. The product was easy to install, and the water tastes significantly different than straight tap water. It is taste-less and "soft" in comparison. The filters are easy to install. We actually ordered the wrong size at first and Aquasana kindly reimbursed us and sent the correct filters. We are now a part of their renewal program and receive filters throughout the year! Good stuff!
Date published: 2018-02-07
Rated 5 out of 5 by from The best water filtration system I have ever used I have used at least 4 different water filtration systems and this is the best. Why? Good tasting water; easy to replace filters. Good company to work with.
Date published: 2018-02-07
Rated 5 out of 5 by from 1st filter change we have been using our 3 stage under counter filter system for about 6 months and the water has been great. I installed the new filters which, were supplied with a new battery for the replacement alarm, with ease and no issues or leaks. The water tastes excellent!
Date published: 2017-12-16
Rated 5 out of 5 by from Easy replacement We decided it was time to replace the filters. Followed the directions and replacement went as planned. And No leaks!
Date published: 2017-11-26
Rated 5 out of 5 by from Easy installation The instructions to replace my old water filters with these new ones were easy to follow making the whole process easy and leak-free.
Date published: 2017-11-25
Rated 5 out of 5 by from Does what is claims to do! I've used AQUASANA filters for my drinking water and also for my two showers for a number of years. Fairly priced and shipping was timely. I like these filters because they not only filter out the normal things, but also filters out fluoride Can't be beat for the price.
Date published: 2017-11-10
Rated 5 out of 5 by from Very Easy I was very glad at how easy it was to swap out the filters and the kit included a new button battery. Nice touch, thanks.
Date published: 2017-11-06
Rated 5 out of 5 by from Peace of mind! Knowing that our drinking water is safe and delicious is more than worth the price of the Aqua Sana water filtration system!
Date published: 2017-10-26
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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.

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User Q & A

I replaced the filters and seem to have trapped air in the system, even after letting the water run for 20 minutes. I had this happen once before as well and the water flow is very slow out of faucet. Any ideas how to fix this?

Asked by: Slow Flow
Shut down the filter at the faucet let it sit for a while, then turn it on fully. Let it run for a while then repeat until air is out of the line.
Answered by: Louie
Date published: 2020-05-21

Does the $65.00 include all three filters and is that for 6 months usage, based on normal household use??

Asked by: Sheshe
Answered by: arfrogs22
Date published: 2020-04-28

Is this replacement filter system compatible with Aqualiv 3-stage FS300 filtration system?

Asked by: Rose Marie
Hello Rose, Thank you for contacting us. I am unable to give the answer as we are not familiar with the Aqualiv 3-stage Fs300 filtration system. Feel free to contact us at 866-662-6885 to help further assist. Thank you, Aquasana Support
Answered by: Aquasana S
Date published: 2020-04-22

When should filters be replaced? Does water stop running when the filters are full?

Asked by: Bobster
we are on the every 6 months plan, depending on your usage and water quality that seems to work. if the filter is on to long it does slow down the water but not stop. if you see a change in flow change it.
Answered by: ALFski61
Date published: 2020-04-19

I don't see a 60% off on these filters that you are advertising

Asked by: DKDaniels
Hello,   It appears you have several questions that would best be answered by a consultation with one of our experts over the phone.  Please call our sales department at 866-662-6885, options 1 and 1 to discuss a potential solution for your home.    Thank you,   Aquasana Support   
Answered by: Aquasana S
Date published: 2019-12-04

in need of a filter cover for the AQ5300. the second filters cover seem to have cracked. any help with actual description or part number so I can order. thanks

Asked by: quat
I would just take a picture and email it to Aquasana, I have the whole house system, it works as it should but it does slow the flow. 
Answered by: Scott in Denver
Date published: 2019-11-14

How the heck do I order replacement filters on your site without being signed up for auto replacement. This is so frustrating!

Asked by: Amber1
Hello Amber, Thank you for your question. On our website their are two options, add to cart in the color orange and the second option is add to cart with water for life in red. Please select the orange option to not be added to water for life. Thank you, -Aquasana Support
Answered by: Aquasana S
Date published: 2019-11-07

How to change this filter. I’m not able to do it 

Asked by: Upma
Generally, I turn off the cold water supply under the sink, unscrew the tops of the various filter casings, remove the used filter cartridge from each, and replace with the new, according to the color coding, replace the tops, screw to tighten, and turn the water back on. I used to have some issues loosening the tops but this has got much better since they changed the tops, making them easy to loosen by hand. There are directions which come in the package with the replacement filters. If these are difficult to follow, you can also call customer service- I have had someone walk me through it the first time. It is easier than it might seem once you have tried it.
Answered by: clean source seeker
Date published: 2019-09-29
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