AO Smith

AO Smith Under Sink Water Filter System - Reduces PFAS Lead Chlorine in Drinking Water - Under Counter

172+ bought in the past month

$99.99

About this item

  • Clean Water Straight From A Dedicated Faucet - Connects with included tee to your 3/8 inch threaded cold water supply line to an additional faucet included with the system. Only takes a few minutes. Includes tubing needed for installation - no plumber required.
  • Purifies Water & Reduces 99% of 78 Harmful Contaminants - Advanced filtration while leaving in all essential minerals. Reduces lead, PFAS (specifically PFOA and PFOS), chlorine, mercury, asbestos, pharmaceuticals, chloramine & more. System will not reduce TDS.
  • Full System Certified To NSF/ANSI Standards 42, 43 and 401 - Product is WQA tested & certified to NSF performance standards, ensuring the structural integrity & quality of your entire system, not just the filtration media.
  • Long Lasting & Cost Effecient - No water is wasted and no harmful contaminants are added to your water during filtration. Filter lasts for 6 months/500 Gallons. $120 or less in annual maintenance cost.
  • Access To Filtered Water Whenever You Need It - System filters water at 0.5 gallons per minute. Perfect for families of 1 to 4.
$99.99

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Sold byA. O. Smith Water Treatment
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Product details

MaterialCarbon Block
Item Weight0.01 Ounces
External Testing CertificationNSF/ANSI Standards 42, 43 and 401
Product BenefitsCertified to reduce 78 contaminants including chlorine, lead, PFAS, microplastics, pesticides, and more See more
BrandAO Smith

Technical specifications

materialCarbon Block
item_weight0.01 ounces
external_testing_certificationNSF/ANSI Standards 42, 43 and 401
product_benefitsCertified to reduce 78 contaminants including chlorine, lead, PFAS, microplastics, pesticides, and more
brandAO Smith
upc811640030063
unit_count1.0 Count
number_of_items1
product_dimensions11.73 x 8.66 x 5.67 inches
manufacturerAO Smith
item_model_numberAO-US-200
batteries1 Lithium Metal batteries required. (included)
date_first_availableFebruary 8, 2019
best_sellers_rank#3,258 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #89 in Under-Sink & Countertop Filtration

From the brand

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Customer reviews

4.61,629 ratings

Customers say

Customers find the water filter easy to install with clear instructions and appreciate its effectiveness, noting it works well even with hard water and completely removes bad flavors.

★★★★★

Easy to install and efficient

CustomerJanuary 23, 2026✓ Verified purchase

These filters are great! I just installed my second one. There was nothing wrong with the first one, bit the plumbing has to be replaced after 5 years. Mine was pushing 6 years and I didn't want to risk broken lines. Installing it is really easy and takes about an hour depending on space and if you have basic plumbing skills. Filter replacement takes 5 minutes. Read more

★★★★★

I wish I hadn’t waited so long to make the change from spring water delivery to this filter.

William PayneFebruary 1, 2026✓ Verified purchase

After more than twenty years of having 5 gallon bottles of spring water delivered, the water started to have a strange taste/odor, so I canceled my delivery service and started looking for alternatives and the New York Times Wirecutter review recommended this one for removal of chlorine, plastics, and metals at a low price. Installation was straightforward (although I wish the lettered parts were included in the numbered diagram) and immediately after the recommended 10 minute flush out period my tap water, which is not horrible but has a chlorine taste, tasted great. I plan to fill a 3 gallon glass water cooler bottle with this filtered water to use with my existing cooler so I always have cold and hot water available as usual. My yearly cost for drinking water will be reduced by about 70% once I factor in the cost of replacing the filters every six months. Highly recommend! Read more

★★★★★

Great filter.

Aaron RFebruary 4, 2026✓ Verified purchase

Excellent tasting filter. Easy to install. Wish the water flow was a little better but overall I am very happy to have it. Read more

★★★★★

Good fit, good price

Ormond LaCourFebruary 20, 2026✓ Verified purchase

Fits good, works good, good price. Comes with battery, which was convenient and unexpected. Read more

★★★★☆

AO Smith filter is reputable and just works 👍

JohnJuly 18, 2025✓ Verified purchase

The media could not be loaded. AO Smith Under Sink Water Filter... https://www.amazon.com/dp/B07NJ4P99G?ref=ppx_pop_mob_ap_share AO Smith filter was purchased after I read many positive reviews. I've been using it for about a month and so far it has been great with no leaks. I am looking forward to the savings I'll have because of the life and cost of these filters. Used with items below --> Straight Stop Valve, SUNGATOR... https://www.amazon.com/dp/B0CLY7K4LK?ref=ppx_pop_mob_ap_share Valve works great! 1 day after I received it I had a leak at a old tap made in my copper pipe mostly because I touched it after I added my water filter and I believe the seals inside were very old. So I cut the horrible mess of plumbing and added this valve inline and am happy to say no leaks and hopefully my copper pipes will be better with this setup and have a long leak free future. John Guest Speedfit 1/4 Inch... https://www.amazon.com/dp/B005S4NYI8?ref=ppx_pop_mob_ap_share JOHN GUEST 1/4" One Way Check... https://www.amazon.com/dp/B00AELC3MI?ref=ppx_pop_mob_ap_share John Guest fittings have a lot of positive reviews and customers said they are good quality. So far I have no reason to say they are not quality. Every John Guest fittings I have used so far has been leak free and just works. I do recommend these fittings over other questionable brands. John Guest 1/4 Inch x 25 Feet... https://www.amazon.com/dp/B00N4O434I?ref=ppx_pop_mob_ap_share The John Guest brand has a lot of positive reviews and customers said they are good quality. So far I have no reason to say they are not quality. This tubing looks nice and appears to be of quality material and works well for my needs for my refrigerator supply line. SUNGATOR End Cap, 1/2-Inch Push... https://www.amazon.com/dp/B082KXR42G?ref=ppx_pop_mob_ap_share I have confidence with these caps from my experience with the Sungator Straight Stop Valve. I purchased these in case of a emergency and if I need to temporarily cap a line before I can do a repair. Read more

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★★★★★

USE PLUMBER’S TAPE ON THREADS WHEN INSTALLING

Sarah AnsellDecember 19, 2025✓ Verified purchase

I have just finished installing my unit this morning and cannot yet attest to its longevity, but I can say it looks nice and was relatively simple to install. IMPORTANTLY for anyone considering this product but concerned about reviews mentioning leaks upon installation, I want to suggest everyone to spend a few more dollars on some plumber’s thread tape. This is a thin plastic, not truly a tape as it has no adhesive, but will attach to itself. You wrap it around the threading 2-3 times at each connection point and this should prevent any leaks. When I first installed the unit, I had leaks from the brass t-connector as well as the connection from the white pipe to the faucet, but once I added this tape there were no more leaks. Save yourself a headache and just get the plumbers tape and use it from the start. I bought this tape years ago to replace my shower valves and it has proven useful numerous times. Bought mine from Home Depot. Another note: my product came with only one white tube, though the instructions listed two. Mine was long enough to simply cut in half to use for both ends of the filter. Just be sure to use a sharp knife, scissors or snips to cut and avoid over-crimping the tube. I used the cut ends for inserting into the filter and it works just fine. Read more

★★★★★

Good product!

Carlos E RodriguezFebruary 22, 2026✓ Verified purchase

Good product, no bad taste on water Read more

★★★★★

Good bargain

I have an above ground pool . This is definitely worth the money. Stop going to the hardware store. Buy 2 .. why? One to use everyday in the summer and one for back up . Has everything you needFebruary 5, 2026✓ Verified purchase

Installed and the water tastes great. I threw away the battery pack that comes with it you do not need that. Not sure why it needs to be there. It's useless Read more

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