🎉
BLACK FRIDAY SALE IS ON - 20% off filtration systems with code HOLIDAY
🎉
3-Stage Under the Sink Water Filter System
Buy Now
3-Stage Under the Sink Water Filter System
3-Stage Under the Sink Water Filter System
3-Stage Under the Sink Water Filter System
3-Stage Under the Sink Water Filter System
3-Stage Under the Sink Water Filter System
3-Stage Under the Sink Water Filter System
3-Stage Under the Sink Water Filter System
3-Stage Under the Sink Water Filter System
3-Stage Under the Sink Water Filter System
3-Stage Under the Sink Water Filter System
3-Stage Under the Sink Water Filter System
3-Stage Under the Sink Water Filter System

3-Stage Under the Sink Water Filter System

Rated 4.9 out of 5
Based on 164 reviews
$ 550.00

Shipping, Returns, and Warranty

Holiday Return Policy: Purchases starting Nov. 15, 2022 will be accepted for return until Jan. 15, 2023.

We offer a 100% Satisfaction Guarantee for the first 90 days after purchase. If for any reason you are not in love with your new Clearly Filtered product, you can return it for a refund. Return shipping is the responsibility of the customer and will be deducted from your refund.

Orders take 24–48 business hours to process (Monday - Friday, excluding holidays).

Domestic Shipping: Free Shipping in the USA. You should receive your shipment 5-7 business days after your order has been processed. Orders valued at $300 USD + will require a signature at delivery.

Meet The Most Powerful Under-Sink Water Filtration System On The Planet

Worried about your tap water? Typical sink filtration systems either remove too few contaminants, leaving you vulnerable to illness, disease, and other dangers pouring from your faucet… or targets beneficial minerals. Our advanced under-sink filtration system removes 232+ contaminants including heavy metals, pollutants, and chemicals. Upgrade to Clearly Filtered today to enjoy clean water from any existing faucet—no plumber, tank, or extra faucet required.

What Sets Our Under-Sink Water Filter System Apart

  • Removes 232+ contaminants. That’s more than most Reverse Osmosis (RO) systems.
  • Compatible with any sink. Connects directly to your cold water line.
  • Easy installation process. Do it yourself in 15 minutes or less. 
  • Portable, space-saving design built for homeowners and renters alike. 
  • Minimizes waste. 75% more efficient than typical RO systems. 
  • 2000-gallon filter life. Most customers change the filters just once a year.
  • Minimal maintenance. Twist-on, twist-off replacement filter cartridges.
  • Proven to perform. Tested by third-party labs.
  • Built in the USA with high-quality filters. 
Free Shipping USA
Free Shipping USA
Limited Lifetime Warranty
Limited Lifetime Warranty
Built in the USA
Built in the USA
30 Day Worry Free Trial
30 Day Worry Free Trial
The System

DIY Installation In 15 Minutes or Less

No plumber or power tools required. All you need is a wrench.

Built For Homeowners and Renters

The system can be mounted horizontally, vertically, or simply leaned up against the wall. Filter performance is not dependent on placement or orientation.

Sleek, Space-Saving Design

The system sits flush and is just 3’’ deep. It doesn’t command any countertop space nor require excess space underneath your sink. Plus, no separate tank, drum, or extra faucet is needed.

Compatible With Any Sink

Connects directly to your cold water line, no matter the material. Can be used with any sink (kitchen sink, bathroom sink, etc.) to provide clean water for drinking, cooking, cleaning, and more.

No Wastewater, Dead Water, Or Remineralization

Unlike typical Reverse Osmosis systems, our advanced under-sink system ensures there is never any excess wastewater, tasteless “dead” water, or the need to remineralize drinking water after filtration.

The Filters

R.O. Quality Filtration—Without The Drawbacks

Filters are powered by a smarter, stronger, and more efficient filtration technology that recognizes what should stay and what should go.

Tool-Free Filter Changes

No need to shut off your water supply or hunt down tools. Replacement filters twist on and off. Plus, all three filters are installed and changed together so you never have to track individual usage.

Built-In Water Shut-Off Valves

Each filter has a leak-proof head and built-in water shut-off valve so there’s never any mess during filter changes.

Rigorously Tested to NSF Standards

Independently tested to NSF / ANSI and EPA standards by accredited labs to guarantee unparalleled protection. We publish performance data publicly so you never wonder what’s in your water.

Extended 2,000-Gallon Filter Life

Proven to perform better longer, no filter change is needed until approximately 2,000 gallons of water have been filtered. Our high-capacity filters last an average of one year for superior performance with minimal maintenance.

Our Technology Isn’t Just Unique, It’s Unparalleled
How It Works

Every system includes three replaceable filters developed with our advanced Affinity Filtration Technology. Each of the three filter cartridges serves a unique purpose as they work together to give you easy access to clean water from any faucet.

Stage 1: Advanced Priming Filter
Stage 2: Heavy Metal + VOCs Filter
 Stage 3: Built-In Fluoride Filter
Stage 1: Advanced Priming Filter

This sophisticated coconut carbon pre-filter minimizes sediment and particles with various micron sizes to prime water for advanced filtration in Stages 2 and 3. The hazards extracted here impact color, odor, and water tastes, so you can see, smell, and experience the difference.

Stage 2: Heavy Metal + VOCs Filter

Built to eliminate hidden heavy metals, herbicides, pesticides, and more, this advanced filter removes the covert chemicals and contaminants that most miss including lead, radiation, chromium, and PFAS.

Stage 3: Built-In Fluoride Filter

The breakthrough technology inside this filter removes superior levels of fluoride without relying on typical Reverse Osmosis technology that blindly removes beneficial minerals and produces excess wastewater.

Check The Stats
How Clearly Filtered Compares
Cost
Installation Difficulty
Power Required
Installation Time / Cost
System Footprint
Fluoride
Lead
Clearly Filtered <br> Under-the-Sink System
Clearly Filtered
Under-the-Sink System
$500
100% DIY
No
10 min / $0
15"W x 3.1"D x 15.4"H
90.7%
98.9%
APEC Reverse Osmosis
APEC Reverse Osmosis
$425
Plumber Required
Yes
2-3 hours / $150+
16"W x 16"D x "17H
93.8%
96.8%
Home Master HydroPerfection Reverse Osmosis System
Home Master HydroPerfection Reverse Osmosis System
$592.95
Plumber Required
Yes
2-3 hours / $150+
24"W x 12"D x 17"H
97.7%
99.3%
Clearly Filtered
Clearly Filtered
Filter Life
100 Gallons
Flouride
98.0%
Lead
99.5%
Arsenic
99.6%
Pesticides
99.9%
Bacteria
99.9%
Chromium-6, Pharmeticals, Hormones, Trihalomethanes, Herbicides
99.9%
Brita
Brita
Filter Life
Flouride
No Claim
Lead
No Claim
Arsenic
No Claim
Pesticides
No Claim
Bacteria
No Claim
Chromium-6, Pharmeticals, Hormones, Trihalomethanes, Herbicides
No Claim
Soma
Soma
Filter Life
Flouride
No Claim
Lead
No Claim
Arsenic
No Claim
Pesticides
No Claim
Bacteria
No Claim
Chromium-6, Pharmeticals, Hormones, Trihalomethanes, Herbicides
No Claim
PUR
PUR
Filter Life
Flouride
No Cliam
Lead
99.5%
Arsenic
No Claim
Pesticides
92.6%
Bacteria
No Claim
Chromium-6, Pharmeticals, Hormones, Trihalomethanes, Herbicides
No Claim
*Information for this chart was compiled from manufacturer websites and brochures. August 2022.
3-Stage Under-the-Sink Review - image of system under a sink
5 stars
Love It!

Love my under sink filter system! It was super easy to install and I love the taste of the water, super clean! I was prepared for the reduced water pressure, but I can barely tell...

Kirstin G.
Verified Buyer
Best Under Sink Filter System - Fluoride, Lead, PFAS
5 stars
Fabulous filter

Took my husband about 5 minutes to install the filter. Love knowing my tap water is safe to drink and washing veggies and fruit using pure water is very comforting. No more chlorine smell! Already had the pitcher and now the under the counter filter system. Thank you!

Kerry C.
Verified Buyer
Under Kitchen Sink Filter - Clearly Filtered
5 stars
Best Filter Ever

I have used the under sink filter for a couple of years now and the filters have performed flawlessly. I am now on my second set of filters with no plan of ever buying anything but these filters. Clearly Filtered has changed the game when it comes to providing clean drinking water. I love knowing that the water I am drinking is safe and only contains the things my body needs.

Steven S.
Verified Buyer
5 stars
Excellent!

The under sink unit arrived today and installation was straightforward and simple. It doesn't take up much space and the water tastes even a bit better than the CF pitcher which is excellent already. Water flow is decreased a small amount as you describe, but any filter system will do that. It's great running it through the existing tap without having to install a separate spigot and call a plumber, and changing the filters in a year will be a breeze. Glad to be on the VIP program as well. Thanks for a well-thought-out and well-designed product. Keep up the good work.

Martin
Verified Buyer
average rating 4.9 out of 5
Based on 164 reviews
  • 5 Stars
    152 Reviews
  • 4 Stars
    10 Reviews
  • 3 Stars
    2 Reviews
  • 2 Stars
    0 Reviews
  • 1 Star
    0 Reviews
99% of reviewers would recommend this product to a friend
Customer photos and videos
164 Reviews
Reviewed by JoAnne Y.
Verified Buyer
I recommend this product
Age Range
45 - 54
How Many People Are In Your Household?
4+
Where Is Your Water Sourced?
Municipal Tap Water
Which Contaminants Are You Most Concerned About?
  • Fluoride
  • Lead
  • Heavy Metals
  • Pesticides
  • PFAS
Rated 5 out of 5
Review posted

Fresh Taste

Super quick to install. The water taste so fresh. My family is drinking so much more water now.

Loading...
Was this helpful?
Reviewed by Andrea M.
Verified Buyer
I recommend this product
Age Range
35 - 44
How Many People Are In Your Household?
2-3
Where Is Your Water Sourced?
Municipal Tap Water
Which Contaminants Are You Most Concerned About?
  • Fluoride
  • Pesticides
  • Pharmaceuticals
  • Heavy Metals
Rated 5 out of 5
Review posted

Happy with the system

This system has met expectations so far. The system was easy to install under the counter and hook up. The water pressure has decreased but we knew that was a possibility and it only affects the cold water, which means I can still wash my dishes by hand with full pressure hot water so it was a fine compromise for clean drinking water. The only thing I didn't like and wasn't prepared for was after the initial installation, and flushing the system for the required 3 minutes, the drinking water left a funny taste in my mouth for about a week. That has since gone away, thankfully.

Loading...
Was this helpful?
Reviewed by Sharon E.
Verified Buyer
I recommend this product
Age Range
55 - 64
How Many People Are In Your Household?
2-3
Where Is Your Water Sourced?
Well Water
Which Contaminants Are You Most Concerned About?
  • PFAS
  • Heavy Metals
Rated 5 out of 5
Review posted

Great Pure Water!

I think it is a great water filter. The main consideration is do you want all of your cold water to be filtered. My husband installed a spicket for the filtered water, so we could still do other kitchen tasks with unfiltered water.

Loading...
Was this helpful?
Reviewed by Andrea S.
Verified Buyer
I recommend this product
Age Range
35 - 44
How Many People Are In Your Household?
2-3
Where Is Your Water Sourced?
Municipal Tap Water
Which Contaminants Are You Most Concerned About?
  • Fluoride
  • Lead
  • Heavy Metals
  • PFAS
  • Pharmaceuticals
Rated 5 out of 5
Review posted

Clean water at last!

This is a great system! I really appreciated how easy it was to install and I can tell that my water is much much cleaner!

Loading...
Was this helpful?
Reviewed by Lisa C.
Verified Buyer
I recommend this product
Age Range
45 - 54
How Many People Are In Your Household?
2-3
Where Is Your Water Sourced?
Municipal Tap Water
Which Contaminants Are You Most Concerned About?
  • PFAS
  • Pharmaceuticals
  • Pesticides
  • Fluoride
  • Heavy Metals
Rated 5 out of 5
Review posted

Lisa

Lovin it

Loading...
Was this helpful?
Reviewed by Mary J.
Verified Buyer
I recommend this product
Age Range
65+
How Many People Are In Your Household?
2-3
Where Is Your Water Sourced?
Well Water
Which Contaminants Are You Most Concerned About?
  • Heavy Metals
Rated 5 out of 5
Review posted

Great system

Easy to install. Works great

Loading...
Was this helpful?
Reviewed by Winter G.
Verified Buyer
I recommend this product
Age Range
35 - 44
How Many People Are In Your Household?
2-3
Where Is Your Water Sourced?
Municipal Tap Water
Which Contaminants Are You Most Concerned About?
  • Fluoride
  • Lead
  • Pesticides
  • Heavy Metals
Rated 5 out of 5
Review posted

Worth every penny!

I absolutely love this filter. It's super easy to install and the water tastes great. I was happy I did not experience a loss of water pressure like other customers had stated, which I was preparing for. Overall I'm a very happy customer .

Loading...
Was this helpful?
Reviewed by Kathleen K.
Verified Buyer
Age Range
45 - 54
How Many People Are In Your Household?
2-3
Where Is Your Water Sourced?
Municipal Tap Water
Which Contaminants Are You Most Concerned About?
  • Fluoride
  • Lead
  • Heavy Metals
  • Pesticides
  • PFAS
Rated 3 out of 5
Review posted

Clearly Filtered reduced water pressure

Reduced cold water flow by 38% not the 20% advertised. Water tastes good, hope this will last more than a year with just 2 people and cold water only use.

Loading...
Was this helpful?
Reviewed by Ralph Y.
Verified Buyer
I recommend this product
Age Range
18 - 25
How Many People Are In Your Household?
4+
Where Is Your Water Sourced?
Well Water
Which Contaminants Are You Most Concerned About?
  • Pesticides
  • Pharmaceuticals
Rated 5 out of 5
Review posted

Best filtration system I have used

Easy installation, definitely noticed a difference in the taste of the water; the water did not taste good at all before.

Thanks for a great American made product

Loading...
Was this helpful?
Reviewed by Fred D.
Verified Buyer
I recommend this product
Age Range
65+
How Many People Are In Your Household?
2-3
Where Is Your Water Sourced?
Municipal Tap Water
Which Contaminants Are You Most Concerned About?
  • Fluoride
  • Lead
  • Heavy Metals
  • Pesticides
  • Pharmaceuticals
Rated 5 out of 5
Review posted

3- Stage Under Sink System

Great tasting! Feel very safe drinking this water!!

Loading...
Was this helpful?
Tech Specs
Material
100% BPA Free
Size/Dimensions
15 x 3.1 x 15.4
Fitting Size
3/8 inch stainless steel braided lines
Weight
6.9lb
Filter
3-Stage Under the Sink Replacement Filters
Filter Life
2,000 Gallons*
Warranty
Limited Lifetime Warranty
Frequently Asked Questions
What contaminants does your under-sink filtration system remove?
Typical filtration systems leveraging only activated carbon or a carbon block filter remove as few as 5 contaminants from drinking water. Our under-sink filtration system has been tested and certified to remove up to 99.9% of 232+ contaminants including fluoride, PFAS, lead, Chromium 6, pharmaceuticals, chloramine, and arsenic. This includes covert contaminants missed (and introduced) during the water treatment process.

To see every contaminant reduced and removed, click here to view the latest performance data.

How do I install the system?
The system can be connected to any sink throughout your whole house. All you have to do is shut off the cold water supply beneath the individual sink, then connect the system to the cold water line and valve. Once connected, you have the option to mount the system with the included screws and bracket—or simply let it sit beneath your sink.

If you’d like to see how quick and easy installation is, check out the short video tutorial linked here.

How long do the filters last?
The included filters, and all replacement filters, have an extended 2000-gallon filter life. The majority of customers install replacement filters just once a year.

Here is a typical replacement schedule:

4+ people: Replace filters every 9 months

3-4 people: Replace filters every 12 months.

1-2 people: Replace filters every 15 months.

To make upkeep as easy as possible, all three filters have the same lifespan. Therefore, they are installed and changed together. Simply twist off the old filters, then twist on the new filters.

Save 10% on replacement filters by enrolling in our free filter subscription service when you purchase your under-sink filtration system.
How does this compare to Reverse Osmosis systems?
The bottom line is that Affinity Filtration Technology is stronger, smarter, and more efficient than standard filtration technology and most Reverse Osmosis systems like Aquasana, APEC, Ispring, and more. Our intelligent technology does not target beneficial minerals, so there’s never any excess wastewater, tasteless “dead” water, or the need for remineralization. Plus, it does not require a bulky water drum, tank, or extra faucet.
How does this compare to water softeners?
Water softeners do not remove contaminants from water. They strictly soften it. Therefore, they do not improve water quality, safety, or cleanliness.
How does the system affect water flow and water pressure?
Superior filtration requires increased contact time with water. Therefore, cold water flow can be reduced up to 25% to ensure the toughest contaminants are extracted. Since the system is constructed to filter cold water, it does not affect the water pressure or flow rate of warm water.
How big is the system? What are its dimensions?
The system is 15” tall, 3.1” deep, and 15.4” wide. Its slim, space-saving design ensures it effortlessly fits under any sink without taking up any excess space.

It is compatible with standard water lines; the majority of which are ⅜-inch stainless-steel, and the lightweight system is just 6.9 pounds.
How does it affect water taste?
Distillation, demineralization, and reverse osmosis tend to result in soft, acidic water with a flat, dull, or “dead” taste. On the other hand, our advanced filtration technology results in clean, high quality, and safe water that’s not too acidic nor too alkaline to retain a pleasant, chlorine-free taste.

*If your tap water is heavily contaminated (most likely if you live in a large or older city), your filter must work harder to keep your water clean, which will decrease the life of the filter.