Drinking Water Filter
1-stage Under Counter

Space-saving under counter design for on-demand filtered water.

5200 water filter

Upgrade to the two-stage For longer filtration and 3 faucet finish choices. Shop Now

The AQ-5100 Single-stage under counter water filter comes with a stylish, all-metal chrome finish faucet.

Single-Stage Under Counter Water Filter - Chrome is rated 4.7 out of 5 by 78.
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50% OFF 1-STAGE UNDER COUNTERS WITH WATER FOR LIFE - limited time!
  • MSRP: 99.99
  • Sale: 69.99

Save 50% + free shipping with Water for Life $49.99

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 filter is a snap!

Pure Performance

Convenience & Value

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

One Aquasana Claryum® filter gives you 5x the capacity of the leading gravity-based pitcher at only 13¢ per gallon with Water for Life.

How It Works

Superior Filtration

Selective Claryum® Filtration

Reduces 77 contaminants including chlorine, chloramines, heavy metals, pesticides, herbicides and industrial solvents.

Easy to install, replace & maintain

Filter lasts up to 3 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.

  • 200 gallons
  • 3 month filter life
  • 1 year warranty
  • 90 day guarantee

Help & Support

Video Help

Replacing the 1-stage under counter filter

Learn More

Read the Reviews

Rated 5 out of 5 by from Clean tasting and great flow rate! My single stage filter has a faster flow rate than I was anticipating. The chrome fitting works well with my faucet. Very pleased.
Date published: 2016-07-17
Rated 5 out of 5 by from Clean tasting and great flow rate! My single stage filter has a faster flow rate than I was anticipating. The chrome fitting works well with my faucet. Very pleased.
Date published: 2016-07-17
Rated 5 out of 5 by from I would buy this product again. Easy to install. East to install and works great!
Date published: 2016-07-13
Rated 5 out of 5 by from Longtime Customers We have been longtime customers of Aqua Sauna and have never been disappointed. We use the filters on our ice maker, drinking faucet, and shower head.
Date published: 2016-07-09
Rated 5 out of 5 by from Longtime Customers We have been longtime customers of Aqua Sauna and have never been disappointed. We use the filters on our ice maker, drinking faucet, and shower head.
Date published: 2016-07-09
Rated 5 out of 5 by from I would buy this again and recommend Easy to install and use
Date published: 2016-04-10
Rated 5 out of 5 by from Great product so far Easy to install and after letting it run the water comes out clear and fast.
Date published: 2015-09-29
Rated 5 out of 5 by from Great product so far Easy to install and after letting it run the water comes out clear and fast.
Date published: 2015-09-29
Rated 5 out of 5 by from Excellent Product! Was very happy with the quality of the product. My husband installed under the sink for us and we are very pleased as it was easy to install. We no longer have to transport water from the water machine a few miles away. I have water to was my vegetables and give clean water to my dog we always have plenty of clean drinking water for us.
Date published: 2015-08-10
Rated 5 out of 5 by from Excellent Product! Was very happy with the quality of the product. My husband installed under the sink for us and we are very pleased as it was easy to install. We no longer have to transport water from the water machine a few miles away. I have water to was my vegetables and give clean water to my dog, we always have plenty of clean drinking water for us.
Date published: 2015-08-10
Rated 5 out of 5 by from great tasting water Am on catchment and need clean, bacteria free water_this product meets all my expectations and saves having to purchase bottled water. Saves the environment as well, since no plastic to recycle.
Date published: 2015-07-19
Rated 5 out of 5 by from great tasting water Am on catchment and need clean, bacteria free water...this product meets all my expectations and saves having to purchase bottled water. Saves the environment as well, since no plastic to recycle.
Date published: 2015-07-19
Rated 5 out of 5 by from Efficient beauty This little device is an elegant addition to my uncluttered and cozy apartment. Efficient beauty enhances and enriches my daily environment and self-care routines. Thank you.
Date published: 2015-07-12
Rated 5 out of 5 by from Efficient beauty This little device is an elegant addition to my uncluttered and cozy apartment. Efficient beauty enhances and enriches my daily environment and self-care routines. Thank you.
Date published: 2015-07-12
Rated 5 out of 5 by from Pleasant tasting easy to use water filter Even though I have only used it for about 1 month, so far the filter has been great. I really enjoy how easy it is to use and how great it makes the water taste.
Date published: 2015-06-21
Rated 5 out of 5 by from Pleasant tasting easy to use water filter Even though I have only used it for about 1 month, so far the filter has been great. I really enjoy how easy it is to use and how great it makes the water taste.
Date published: 2015-06-21
Rated 5 out of 5 by from Love it Great value. I had grown tired of replacing Zero Water's expensive filters and was concerned about the validity of their claims (TDS readings had become very unreliable). I was shopping for an under the counter appliance and Aquasana's pricing was very competitive. So I went for it.||Installation was easy. I only have a three hole sink and I wanted to keep my sprayer, so I installed a faucet tha
Date published: 2015-04-27
Rated 5 out of 5 by from Love it Great value. I had grown tired of replacing Zero Water's expensive filters and was concerned about the validity of their claims (TDS readings had become very unreliable). I was shopping for an under the counter appliance and Aquasana's pricing was very competitive. So I went for it. Installation was easy. I only have a three hole sink and I wanted to keep my sprayer, so I installed a faucet that has an integrated sprayer. Everything looks and works great.
Date published: 2015-04-27
Rated 5 out of 5 by from Just what we were looking for. Really happy with this product. Probably could have gone with the 2-stage but was looking to save money. This is so much better than a counter-top filter taking up space though. Relatively easy to install. Had to squeeze myself under the sink and read the directions but it was simple. Water taste is great - no more chlorine! There were reviews complaining about a slow pour; while it is slower than
Date published: 2015-04-09
Rated 5 out of 5 by from Just what we were looking for. Really happy with this product. Probably could have gone with the 2-stage but was looking to save money. This is so much better than a counter-top filter taking up space though. Relatively easy to install. Had to squeeze myself under the sink and read the directions but it was simple. Water taste is great - no more chlorine! There were reviews complaining about a slow pour; while it is slower than right out of the tap it's definitely not excessively slow - I mean, it's filtering the water there's going to be some slow down. Would buy again.
Date published: 2015-04-09
Rated 5 out of 5 by from Great quality! I use Aquasana water filter for drinking. This is my first time using under-the-sink filter. I have used just about all possible faucet filters, but all of them kept on cracking, blowing-up or just stop working, because my kids would turn them on with hot water and on high water flow. I realized that I need the filter that has it's own faucet. That's why I ordered Aquasana under-the-sink filtrat
Date published: 2015-03-13
Rated 5 out of 5 by from Great quality! I use Aquasana water filter for drinking. This is my first time using under-the-sink filter. I have used just about all possible faucet filters, but all of them kept on cracking, blowing-up or just stop working, because my kids would turn them on with hot water and on high water flow. I realized that I need the filter that has it's own faucet. That's why I ordered Aquasana under-the-sink filtration system. I received it couple weeks ago. I was able to install it on my own, just by following instructions given. Even though I got the simplest system, I like the water taste. And the good looking faucet is well approved by my kids.
Date published: 2015-03-13
Rated 5 out of 5 by from works great installed new sink works great
Date published: 2015-03-12
Rated 5 out of 5 by from great Great
Date published: 2014-10-19
Rated 5 out of 5 by from Great value I love this easy and convenient filter system.The water taste is amazing and affortable with the water for life.
Date published: 2014-08-16
Rated 5 out of 5 by from Great value I love this easy and convenient filter system.The water taste is amazing and affortable with the water for life.
Date published: 2014-08-16
Rated 5 out of 5 by from As Advertised Purchased the under sink system about 2 months ago. It works well and and we are pleased. No leaking.
Date published: 2014-06-23
Rated 5 out of 5 by from As Advertised Purchased the under sink system about 2 months ago. It works well and and we are pleased. No leaking.
Date published: 2014-06-23
Rated 5 out of 5 by from Vast improvement I am very happy that I purchased and installed the single stage under counter water filter. The water it produces is much better than it was before the unit was installed. I don't have the scum on the surface of the tea or coffee that I once had, and the water is so much better to drink. The flow is not as fast as I'm accustomed to, but then one must remember the amount of filter material and the
Date published: 2014-06-21
Rated 5 out of 5 by from Vast improvement I am very happy that I purchased and installed the single stage under counter water filter. The water it produces is much better than it was before the unit was installed. I don't have the scum on the surface of the tea or coffee that I once had, and the water is so much better to drink. The flow is not as fast as I'm accustomed to, but then one must remember the amount of filter material and the diameter of the pipe on the faucet and how much better the water is and then I have no problem with the flow rate.
Date published: 2014-06-21
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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.

  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

I'm allergic to coconut & palm. Do your filters use coconut shells to filter the water? Thank you.

Asked by: Coco-no-no
Yes, All of our systems utilize coconut shell carbon. Thank you, Aquasana Customer Support
Answered by: Aquasana Customer Support
Date published: 2018-05-10

I have had my single stage for a few months . It is leaking around the housing unit. Do you have any suggestions for troubleshooting?

Asked by: Linda S
Please contact our customer service team at 866.662.6885 for troubleshooting assistance. Thank you, Aquasana Customer Support
Answered by: Aquasana Customer Support
Date published: 2018-05-09

 My sink fixtures are a brushed product. Probably brushed nickel. Do you carry it in the brushed finish? It really should match. But I would like this product..

Asked by: Txsuz
Please contact our customer service team at 866.662.6885 and we can submit an order for a 1 stage system with a brushed nickel faucet. Thank you, Aquasana Customer Support
Answered by: Aquasana Customer Support
Date published: 2018-05-07

Hi , I need your under the sink filterAQ5209 but without the faucet . I already have one installed on the sink . Please let me the price and how can I order it 

Asked by: Saima
For replacement parts, please contact our service team at 866.662.6885. Anyone on the team will be happy to discuss your warranty options. Thank you, Aquasana Customer Support
Answered by: Aquasana Customer Support
Date published: 2018-04-05

how will I know when to replace the filter? Is there an indicator somewhere?

Asked by: JimScanlon
The AQ-5100 is not designed with a built-in battery to notify a filter change. The AQ-5100 filters are recommended to change every 6 months. Thank you, Aquasana Customer Support
Answered by: Aquasana Customer Support
Date published: 2018-04-05

Are replacement washers and "o"rings available for the faucet on this water filter system (5300+)?

Asked by: Thirsty for pure water
Hello! For replacement parts please contact our service team at 866.662.6885. Thank you, Aquasana Customer Support
Answered by: Aquasana Customer Support
Date published: 2017-10-12

Will this product remove iron from my well water? Thank you, ed

Asked by: fros dad

Are the filters all the same, just adding capacity with 3 stage vs 2 Stage vs 1 stage? Why do the pics show different colors on the filters? (Black, yellow and red). Also, is the Aq 5100 still available. For my RV I only need 200 gal capacity.

Asked by: pkinpc
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