Top 10 Best ao smith water filter replacement in 2026

Last Updated - 6/15/2026

🏆Best Choice

PUREPLUS

1 Micron 2.5" x 10" Whole House CTO Carbon Water Filter Cartridge Replacement for Under Sink Water Filter System, Dupont WFPFC8002, WFPFC9001, FXWTC, SCWH-5, WHEF-WHWC, WHCF-WHWC, AMZN-SCWH-5, 4Pack

9.8

ChoiceComparer.com Score

9.8

/ 10

Outstanding

Main highlights

•❄️【Authoritative Certifications】 - The filter is certified against NSF/ANSI 42 by IAPMO, filtering out 99% Chlorine, odor and improve water taste significantly. It also certified by European , Canadian CSA, BPA Free and Australian Water Mark. Only select products with authoritative certifications for your loved ones.
•❄️️【HIGH CAPACITY】 The CTO carbon filter can filter up to 13000 gallons depending on water quality. Suggest to replace it every 3- 6 months for the average household for optimal performance depending on the use. Let it bring a wonderful cleaner water experience to your loved ones.
•❄️️【COMPATIBLE FILTERS】 - The filter can be used in any standard 10” x2.5” RO Unit whole house filtration system and compatible with standard 10 inch X 2.5 inch filter models of DuPont WFPFC8002, WFPFC9001, SCWH-5, Whirlpool WHCF-WHWC, Pentek CBC-10, GE FXWTC, FX12P, GXWH20F, Culligan D-10A & D-10, Aquaboon CTO, Ace Hardware 84608, Apex IR-40, Cornelius COR10B1, COR10B5, Dupont DWC30001, PFC8002, WFDWC30001, WFPFC8002, WFPFC9001, 46942, EcoLab 9320-1002, Everpure CG5-10, DEV9108-15, Flotec TO1, ICEPURE CTO10.
•❄️️【 HIGHER QUALITY FILTRATION】 - Carbon is well known for its unique absorbing ability, a pound of carbon is able to provide up 125 acres of filtering surface area. Our RO carbon filter is made of 100% coconut shell activated carbon block to filter most sediments, Sintering Technology ensures high absorbing capacity offers a much finer filtration of suspended particles and dirt.
•❄️️【STRICT QUALITY CONTROL】 - All water filter home cartridge are produced under the ISO9001 standard and inspected under strict quality control. Each filter is produced through 34 production processes, 400PSI pressure test, 10,000 water hammer tests, and 6 independent tests.
•❄️【WHY PUREPLUS】PUREPLUS has 20 years of expertise and 200 patents in the water filtration industry. Every year it provides filtration solutions to more than 200 million family worldwide, uses advanced filtration technology to ensure high quality water. Trust us, make PUREPLUS your resolution.

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$26.99

$31.99

-16%

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AO Smith

AO Smith Under Sink Water Filter System - Reduces PFAS, Lead, & Chlorine in Drinking Water - Under Counter Claryum Filtration for Kitchen - 2-Stage - AO-US-200

9.7

ChoiceComparer.com Score

9.7

/ 10

Outstanding

Main highlights

•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.

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$119.99

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AO Smith

AO Smith Basic Direct Connect Under Sink Replacement Filter For AO-MF System - Carbon Block Filter Reduces Up To 99% Of 9 Harmful Contaminants - AO-MF-R

9.5

ChoiceComparer.com Score

9.5

/ 10

Outstanding

Main highlights

•Replacement Filter For The Basic Main Faucet Under Sink Water Filter System (AO-MF) - Easy replacement and no plumber necessary. Includes one Carbon Block filter. Does NOT fit AO-MF-ADV, AO-FF, or AO-MF-B filter systems.
•Purifies Water & Reduces 99% of 9 Harmful Contaminants - Basic filtration while leaving in all essential minerals. Reduces chlorine, lead, atrazine, lindane and turbidity. System will not reduce TDS.
•Long Lasting & Cost Efficient - No water is wasted and no harmful contaminants are added to your water during filtration. Filter lasts for 1,389 gallons or 6 months.
•Use only certified, genuine AO Smith replacement filters for continued contaminant removal and system performance.
•IAPMO Tested & Certified to NSF/ANSI standards 42 and 53.

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$49.99

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AO Smith

AO Smith Single-Stage Whole House Water Filtration System - Sediment Pre-Filter - NSF Certified - AO-WH-PRE

9.4

ChoiceComparer.com Score

9.4

/ 10

Excellent

Main highlights

•Sediment Prevention - The AO-WHO-PRE system is certified to reduce sediment, dirt and rust in your water, applicances and plumbing fixtures. Designed to bring you sediment-free water from every tap in your home.
•Easy Filter Replacement - The built-in pressure relief button allows for easy filter replacements. Uses universal 2.5 inch replacement cartridges (sold separately.)
•For Stand-Alone Or Combined Use - This Whole House Filter System can be used by itself or with additional A.O. Smith filtration systems, allowing you to customize your filtration system to fit your home's unique needs.
•Simple DIY Installation - Package includes filter housing and housing wrench. No plumber needed. Does NOT include optional mounting bracket for wall mounting.
•NSF Certified - System is NSF Certified to standard 42 for the removal of particulate.

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$29.99

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AO Smith

AO Smith Reverse Osmosis Water Filter Replacement Cartridges - Carbon Replacement Filters for AOS-HERO RO Filtration Systems - Reduce Chlorine & Other Contaminants from Drinking Water - AOS-HERO-S1S3

9.2

ChoiceComparer.com Score

9.2

/ 10

Excellent

Main highlights

•Clean, Healthy Water - Reduce up to 99% of 90 contaminants including chlorine, chloramine, lead, pesticides, PFOA/PFOS, cysts, microplastics, and more from water in your house.
•Advanced Filtration - Replacement filter cartridges indepently tested to NSF standards 42, 53, 58, and 401.
•Use only certified, genuine AO Smith replacement filter cartridge for continued contaminant removal and system performance.
•Stage 1 and Stage 3 carbon replacement filter cartridges for AOS-HERO-CHR (B0CCQF4QZX) systems. Replace filters every six months or 365 gallons whichever comes first.

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$79.99

$99.99

-20%

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AO Smith

AO Smith AO-MF-B-R Under Sink Water Filter Replacement - NSF Certified

9.1

ChoiceComparer.com Score

9.1

/ 10

Excellent

Main highlights

•Replacement filter for: AO Smith Undersink Water Filter (AO-MF-B) - NSF certified to standard 42 for chlorine taste and odor.
•Use only certified, genuine A. O. Smith replacement filters for continued contaminant removal and system performance.
•Single stage water filtration from your existing faucet - Reduces chlorine taste and odor.
•No water is wasted, and nothing is added to your water during the filtration process.
•Filter lasts 6 months with an annual replacement cost of $40 or less - Includes one filter replacement cartridge.

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$16.99

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AO Smith

AO Smith Reverse Osmosis Water Filter Membrane Replacement - Replacement for AOS-HERO RO Filtration Systems - Filters to Reduce Chlorine & Other Contaminants from Drinking Water - AOS-HERO-S2

8.9

ChoiceComparer.com Score

8.9

/ 10

Great

Main highlights

•Clean, Healthy Water - Reduce up to 99% of 90 contaminants including chlorine, chloramine, lead, pesticides, PFOA/PFOS, cysts, microplastics, and more from water in your house.
•Advanced Filtration - Replacement membrane indepently tested to NSF standards 42, 53, 58, and 401.
•Use only certified, genuine AO Smith replacement filter cartridge for continued contaminant removal and system performance.
•Stage 2 reverse osmosis replacement membrane for AOS-HERO-CHR (B0CCQF4QZX) systems. Replace every 12 months or 730 gallons whichever comes first.

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$69.99

$79.00

-11%

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AO Smith

Claryum®, Carbon, & Microbial Remineralizer Replacements for the AO-US-RO-MB-4000 - Not Compatible with SmartFlow Systems

8.8

ChoiceComparer.com Score

8.8

/ 10

Great

Main highlights

•Replacement Carbon Filter, Claryum Filter, and Remineralizer with Microbial Boost for: The Clean Water Machine with RO & Microbial Boost (AO-US-RO-MB-4000). Not compatible with Smartflow Systems.
•Reduces up to 99% of 90 harmful contaminants including lead, mercury, pesticides, pharmaceuticals, and chlorine, and more.
•Remineralization & Microbial Filtration - returns the healthy minerals lost in the reverse osmosis process - such as calcium, magnesium, and potassium while removing bacteria and viruses.
•Claryum filtration reduces harmful contaminants – those you can see, smell and taste, and those you can’t – for optimally clean water - Filters last 6 months or 365 gallons.
•IAPMO certified to NSF/ANSI Standards 542, 53, and 401.

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$99.99

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AO Smith

AO Smith Membrane & Remineralizer Replacements

8.6

ChoiceComparer.com Score

8.6

/ 10

Good

Main highlights

•Replacement RO Membrane & Remineralizer for: The Clean Water Filter with RO Boost (AO-US-RO-4000). Not Compatible with SmartFlow Systems.
•Reverse Osmosis reduces up to 99% of harmful contaminants including lead, fluoride, asbestos, chromium, and nitrates.
•RO system with Remineralization - returns the healthy minerals lost in the reverse osmosis process - such as calcium, magnesium, and potassium.
•RO Membrane and Remineralizer last approximately 12 months - Use only certified, genuine A. O. Smith replacement filters for continued contaminant removal and system performance.
•NSF certified to standard 58. Does not include 90 degree elbow connection to drain. Please use existing 90 degree elbow to connect the remineralizer to the drain line. Do NOT discard the connector with the old membrane.

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$99.99

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AO Smith

AO Smith Water Filter for Sink Faucet - Advanced Direct Connect Under Sink Water Filter System - Claryum Filtration Reduces 99% of 78 Harmful Contaminants - AO-MF-ADV

8.5

ChoiceComparer.com Score

8.5

/ 10

Good

Main highlights

•Clean Water Straight From Your Faucet - Connects directly to your kitchen sink cold water line without the need for an additional faucet. Only takes a few minutes. Includes system, one Claryum filter, and all parts necessary for installation No plumber required. Measure your space to ensure unit fits under the sink (4 x 4 x 20 inches).
•Purifies Water & Reduces 99% of 78 Harmful Contaminants - Advanced filtration while leaving in all essential minerals. Reduces lead, mercury, asbestos, pesticies, pharmaceuticals, chlorine, chloramine & more. System will not reduce TDS.
•IAPMO certified to NSF/ANSI Standards 42, 53 (includes P473), and 401 for the reduction of over 96% of chlorine and chloramines, 99% of lead and microplastics, and 95% of PFOA/PFOS, 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 784 gallons or 6 months. $140 or less in annual maintenance cost.
•Fast, Filtered Water - System filters water at 1.5 gallons per minute. Perfect for families of 4 or more.

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$119.99

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