9 Best under sink countertop filtrations of 2026

Save up to 30% off

1

Waterdrop

Waterdrop WD-T3-C Reverse Osmosis Water Filter, NSF/ANSI 372 Certified, 8-Stage Under Sink RO Water Filter, 450GPD Tankless Water Filtration System, 2:1 Pure to Drain, BPA Free, Plug-in Required

25% Off
9.6

Exceptional

Our Rating
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2

EXPRESS WATER
Express Water RO5DX Reverse Osmosis Filtration NSF Certified 5 Stage RO System with Faucet and Tank – Under Sink Water Plus 4 Filters – 50 GPD, 14 x 17 x 5, White
Main highlights

Exceptional Contaminant Reduction
Reduces up to 99.99% of lead, chlorine, fluoride, and more for pure, clean water.

Versatile Home Applications
Ideal for under-sink installation, providing clean water for drinking, cooking, and appliances.

Praised for Taste Improvement
Customers love the crisp, clean taste of water post-filtration.
Key specs
- Filtration Stages:Reverse Osmosis
- Installation Type:Under Sink
- Dimensions:14 x 5 x 15 inches
- Contaminants Removed:Lead, Chlorine, Fluoride
- Maintenance Frequency:N/A
9.4

Excellent

Our Rating

9.5
Flavor

9.3
Instruction

9.3
worth the money
3

Waterdrop
Waterdrop TSU 0.01 Micron Ultra Filtration Under Sink Water Filter System, 3-Stage Tankless Under Sink Water Filtration System with Faucet, Smart Panel, Not Lower TDS, Drilling Required

30% Off
Main highlights

Advanced Ultrafiltration Membrane
Reduces harmful substances larger than 0.01 um, improving water safety.

Ideal for Mineral Retention
Perfect for homes needing mineral-rich water without TDS reduction.

Customer Praised Ease of Use
Installation and filter replacement are straightforward and user-friendly.
Key specs
- Filtration Stages:3 stages
- Installation Type:Under sink
- Dimensions:18.39 x 6.38 x 18.62 inches
- Contaminants Removed:Chlorine, taste, odor, metals
- Maintenance Frequency:24 months
9.2

Excellent

Our Rating

9.5
Easy installation

9.1
Flavor

8.4
worth the money
4

CuZn
Under Sink Water Filter for Sink Faucet by CuZn, 5 Year Filtration Life, Reduces PFAs, PFOS, Lead, Chlorine, Improves Taste of Tap Water with NSF/ANSI 42 & 372 Certified High Performance
Main highlights

High Capacity and Longevity
The CuZn UC-200 offers up to 5 years of filtration with a high capacity of 50,000 gallons, ensuring long-lasting performance.

Ideal for Municipal Water
Perfect for municipal water purification, not suitable for private well water, maintaining essential minerals without reducing TDS or PPM.

Praised Customer Service
Customers frequently commend CuZn's responsive customer service and the ease of installation, enhancing the overall user experience.
8.9

Very Good

Our Rating

9.9
Easy installation

9.9
Instruction

9.7
Flavor
5

Waterdrop
Waterdrop TSA 8 Layer Under Sink Water Filter System, Under Sink Water Filtration System, Reduces PFAS, PFOA/PFOS, Fluoride, Chlorine, Bad Taste & Odor, NSF/ANSI 42 Certified Element, USA Tech
Main highlights

Multi-Stage Filtration Efficiency
8-stage filtration reduces PFAS, heavy metals, chlorine, and more.

Perfect for Home Kitchens
Ideal for households needing pure, great-tasting water directly.

Highly Praised Water Taste
Customers love the improved taste compared to other filters.
8.8

Very Good

Our Rating

9.3
Flavor

9.1
Easy installation

9.1
Instruction
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6

Waterdrop
Waterdrop TST-UF 0.01μm Ultra-Filtration Under Sink Water Filter System, Stainless Steel Water Filter for Sink, 5X Service Life Under Sink Water Filtration System, Removes 99% of Substances

21% Off
Main highlights

Efficient Filtration System
Reduces bacteria, chlorine, heavy metals, and odors, enhancing water taste.

Versatile Installation Options
Ideal for homes avoiding drilling; can hang or floor place.

Easy Installation Praised
Customers love the straightforward setup and stainless steel durability.
8.7

Very Good

Our Rating

9.7
Easy installation

9.1
Instruction

8.9
Flavor
7

Waterdrop
Waterdrop TST-UF 0.01μm Ultra-Filtration Under Sink Water Filter System, Stainless Steel Water Filter for Sink, 5X Service Life Under Sink Water Filtration System, Removes 99% of Substances
Main highlights

Efficient Filtration System
Reduces bacteria, chlorine, heavy metals, and odors, enhancing water taste.

Versatile Installation Options
Ideal for homes avoiding drilling; can hang or floor place.

Easy Installation Praised
Customers love the straightforward setup and stainless steel durability.
8.6

Very Good

Our Rating

9.7
Easy installation

9.1
Instruction

8.9
Flavor
8

iSpring
iSpring CU-A4 0.01μm Ultra-Filtration Under Sink Water Filter System, Tankless 4-Stage High Capacity, Remove 99.99% Contaminants, Quick Filter Change with Brushed Nickel Faucet, White

21% Off
Main highlights

Superior Filtration Performance
Removes 99% of chlorine, lead, and contaminants while retaining minerals.

Versatile Installation Options
Ideal for sinks, refrigerators, and coffee makers without a storage tank.

Highly Praised Customer Support
Customers commend responsive service and easy filter replacements.
8.5

Good

Our Rating

9.3
Easy installation

9.1
worth the money

9.1
Sheerness
9

iSpring
iSpring CU-A4 0.01μm Ultra-Filtration Under Sink Water Filter System, Tankless 4-Stage High Capacity, Remove 99.99% Contaminants, Quick Filter Change with Brushed Nickel Faucet, White

25% Off
Main highlights

Superior Filtration Performance
Removes 99% of chlorine, lead, and contaminants while retaining minerals.

Versatile Installation Options
Ideal for sinks, refrigerators, and coffee makers without a storage tank.

Highly Praised Customer Support
Customers commend responsive service and easy filter replacements.
8.4

Good

Our Rating

9.3
Easy installation

9.1
worth the money

9.1
Sheerness

9 Best under sink countertop filtrations of 2026

1

Waterdrop WD-T3-C Reverse Osmosis Water Filter, NSF/ANSI 372 Certified, 8-Stage Under Sink RO Water Filter, 450GPD Tankless Water Filtration System, 2:1 Pure to Drain, BPA Free, Plug-in Required

How do we rank?

How do we rank?

Analyzing top stores

2

Express Water RO5DX Reverse Osmosis Filtration NSF Certified 5 Stage RO System with Faucet and Tank – Under Sink Water Plus 4 Filters – 50 GPD, 14 x 17 x 5, White

9.5

9.3

9.3

3

Waterdrop TSU 0.01 Micron Ultra Filtration Under Sink Water Filter System, 3-Stage Tankless Under Sink Water Filtration System with Faucet, Smart Panel, Not Lower TDS, Drilling Required

9.5

9.1

8.4

4

Under Sink Water Filter for Sink Faucet by CuZn, 5 Year Filtration Life, Reduces PFAs, PFOS, Lead, Chlorine, Improves Taste of Tap Water with NSF/ANSI 42 & 372 Certified High Performance

9.9

9.9

9.7

5

Waterdrop TSA 8 Layer Under Sink Water Filter System, Under Sink Water Filtration System, Reduces PFAS, PFOA/PFOS, Fluoride, Chlorine, Bad Taste & Odor, NSF/ANSI 42 Certified Element, USA Tech

9.3

9.1

9.1

6

Waterdrop TST-UF 0.01μm Ultra-Filtration Under Sink Water Filter System, Stainless Steel Water Filter for Sink, 5X Service Life Under Sink Water Filtration System, Removes 99% of Substances

9.7

9.1

8.9

7

Waterdrop TST-UF 0.01μm Ultra-Filtration Under Sink Water Filter System, Stainless Steel Water Filter for Sink, 5X Service Life Under Sink Water Filtration System, Removes 99% of Substances

9.7

9.1

8.9

8

iSpring CU-A4 0.01μm Ultra-Filtration Under Sink Water Filter System, Tankless 4-Stage High Capacity, Remove 99.99% Contaminants, Quick Filter Change with Brushed Nickel Faucet, White

9.3

9.1

9.1

9

iSpring CU-A4 0.01μm Ultra-Filtration Under Sink Water Filter System, Tankless 4-Stage High Capacity, Remove 99.99% Contaminants, Quick Filter Change with Brushed Nickel Faucet, White

9.3

9.1

9.1

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