January 2, 2026

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10 Best replacement under sink water filters of 2026

Explore top picks

Best Choice

1

iSpring

iSpring F6K75 NSF Certified Replacement Under-Sink Water Filters, 6-Stage Reverse Osmosis RO Water Filtration Systems with Alkaline Mineral Filter, 6-months Replacement Supply Set, 6 Count (Pack of 1)
9.9

Exceptional

Our Rating

9.5
worth the money

9.5
Flavor

9.3
Easy installation
How do we rank?

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Value for Money

2

Filtrete
Filtrete Advanced Under Sink Quick Change Water Filtration Filter 3US-PF01, for use with 3US-PS01 System
Main highlights

Effective Filtration and Taste Improvement
Reduces chlorine taste, odor, and microbial cysts for healthier water.

Ideal for Everyday Kitchen Use
Perfect for cold water lines in kitchens and bathrooms.

Simple Installation and Maintenance
Quick 1/4 turn filter change praised for ease and convenience.
Key specs
- material:Sand
- installation:Under Sink
- dimensions:13.75 x 3.4 x 3.4 inches
- pore size:0.5 microns
- filtration efficiency:Reduces chlorine, microbial cysts
9.8

Exceptional

Our Rating

9.5
Easy installation

9.1
Flavor

8.9
worth the money
3

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
Main highlights

Certified for Safety and Quality
Meets EC1935-2004, Water Mark, TUV, ROHS, REACH, BPA FREE standards ensuring safe water filtration.

Best for Tap Water Filtration
Ideal for filtering chlorine, sand, rust, and sediment in tap water.

Enhanced Water Taste
Customers praise the improved taste of water due to effective carbon filtration.
9.7

Exceptional

Our Rating

9.5
Easy installation

8.9
worth the money

8.7
Flavor
4

Waterdrop
Waterdrop RF10 Replacement Filter Cartridge for 10UA/10UB Under Sink Water Filter, Reduces PFAS, PFOA/PFOS, Lead, Chlorine, Bad Taste & Odor, NSF/ANSI 42 Certified, 11K Gallons High Capacity
Main highlights

Key Features
Ultra-long service life of 1 year/11,000 gallons, innovative multistage filtration, IAPMO certified, quick replacement design.

Ideal Use Cases
Perfect for households using municipal water seeking to reduce PFAS, PFOA/PFOS, heavy metals, chlorine, and improve taste and odor.

Customer Praise
Most reviews highlight the ease of filter replacement, significant improvement in water taste, and the peace of mind from reduced contaminants.
9.6

Exceptional

Our Rating

9.7
Easy installation

9.5
Flavor

9.1
worth the money
5

GE
GE Under Sink Water Filter Replacement, Dual Flow, Reduces Sediment, Rust & Other Impurities from Water, Fits GXK255TBN Under Sink Filtration System, Replace Every 6 Months, FQK2J, 2 Filters
Main highlights

Key Features
Dual flow filtration, easy twist and lock design, IAMPO Certified, reduces harmful chemicals, six-month lifespan.

Ideal Use Cases
Perfect for households with GXK285JBL, GXK295JNN, GXSL55R, GXSV65R, GNSV70R systems, and those prioritizing water purity and taste.

Customer Praise
Most reviews highlight the ease of installation and noticeable improvement in water taste and quality as top benefits.
9.5

Excellent

Our Rating

9.9
Easy installation

9.1
Flavor

8.0
worth the money
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6

Waterdrop

Waterdrop RF15 Replacement Filter Cartridge For 15UA/15UB/15UC Under Sink Water Filter, Reduces PFOA/PFOS, PFAS, Lead, Chlorine, Bad Taste & Odor, NSF/ANSI 42 Certified, 19K Gallons High Capacity
9.2

Excellent

Our Rating

9.9
Easy installation

9.5
Flavor

9.3
worth the money
7

Waterdrop
Waterdrop 10UA Under Sink Water Filter System, Reduces PFAS, PFOA/PFOS, Lead, Chlorine, Bad Taste & Odor, Under Counter Water Filter Direct Connect to Kitchen Faucet, NSF/ANSI 42 Certified, 1 Year
Main highlights

Efficient Contaminant Reduction
Reduces PFAS, PFOA/PFOS, lead, chlorine, and odors, ensuring safe drinking water.

Versatile Installation Options
Ideal for kitchens, bathrooms, RVs, and offices; fits standard US sinks.

Simple Installation Process
Users praise its easy, quick installation and clear instructions.
Key specs
- Installation Type:Under-sink
- Maintenance Frequency:12 months or 8k gallons
- Dimensions:3.6 x 3.6 x 12.3 inches
- Contaminants Removed:PFAS, PFOA/PFOS, rust, lead
- Filtration Stages:N/A
9.0

Excellent

Our Rating

9.7
Easy installation

9.7
Sheerness

9.5
Instruction
8

APEC WATER

APEC Water Systems FILTER-SET-ES High Capacity Replacement Pre-Filter Set For Essence Series Reverse Osmosis Water Filter System Stage 1-3
8.9

Very Good

Our Rating

9.3
Flavor

9.3
Easy installation

9.1
worth the money
9

iSpring

iSpring F3 NSF Certified 6-Month Prefilter Replacement Water Filter Cartridge Pack Set for Standard Reverse Osmosis RO Systems
8.7

Very Good

Our Rating

9.3
Flavor

9.1
Easy installation

9.1
worth the money
10

APEC WATER
APEC Water Systems ULTIMATE Series US Made Stage 1, 2 & 3 Replacement Filter For Undersink System(FILTER-SET)
Main highlights

Key Features and Benefits
Enhances RO system performance with sediment, 2 carbon block filters; superior to GAC in removing chlorine, taste, odor, and particles.

Ideal Use Cases
Perfect for households with RO-45, RO-90, RO-PH90, RO-PERM, RO-PUMP systems; excels in areas with high sediment and chlorine water content.

Customer Reviews Highlight
Most praised for significantly improving water taste and purity, with notable longevity and effectiveness of the filters.
Key specs
- material:Polypropylene, Carbon Block
- installation:Under-Sink
- dimensions:11.5 x 9.3 x 4.8 inches
- pore size:N/A
- filtration efficiency:N/A
8.4

Good

Our Rating

9.7
Easy installation

9.3
Flavor

9.1
worth the money

10 Best replacement under sink water filters of 2026

1

iSpring F6K75 NSF Certified Replacement Under-Sink Water Filters, 6-Stage Reverse Osmosis RO Water Filtration Systems with Alkaline Mineral Filter, 6-months Replacement Supply Set, 6 Count (Pack of 1)

9.5

9.5

9.3

How do we rank?

How do we rank?

Analyzing top stores

2

Filtrete Advanced Under Sink Quick Change Water Filtration Filter 3US-PF01, for use with 3US-PS01 System

9.5

9.1

8.9

3

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

9.5

8.9

8.7

4

Waterdrop RF10 Replacement Filter Cartridge for 10UA/10UB Under Sink Water Filter, Reduces PFAS, PFOA/PFOS, Lead, Chlorine, Bad Taste & Odor, NSF/ANSI 42 Certified, 11K Gallons High Capacity

9.7

9.5

9.1

5

GE Under Sink Water Filter Replacement, Dual Flow, Reduces Sediment, Rust & Other Impurities from Water, Fits GXK255TBN Under Sink Filtration System, Replace Every 6 Months, FQK2J, 2 Filters

9.9

9.1

8.0

6

Waterdrop RF15 Replacement Filter Cartridge For 15UA/15UB/15UC Under Sink Water Filter, Reduces PFOA/PFOS, PFAS, Lead, Chlorine, Bad Taste & Odor, NSF/ANSI 42 Certified, 19K Gallons High Capacity

9.9

9.5

9.3

7

Waterdrop 10UA Under Sink Water Filter System, Reduces PFAS, PFOA/PFOS, Lead, Chlorine, Bad Taste & Odor, Under Counter Water Filter Direct Connect to Kitchen Faucet, NSF/ANSI 42 Certified, 1 Year

9.7

9.7

9.5

8

APEC Water Systems FILTER-SET-ES High Capacity Replacement Pre-Filter Set For Essence Series Reverse Osmosis Water Filter System Stage 1-3

9.3

9.3

9.1

9

iSpring F3 NSF Certified 6-Month Prefilter Replacement Water Filter Cartridge Pack Set for Standard Reverse Osmosis RO Systems

9.3

9.1

9.1

10

APEC Water Systems ULTIMATE Series US Made Stage 1, 2 & 3 Replacement Filter For Undersink System(FILTER-SET)

9.7

9.3

9.1

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