August 3, 2025

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10 Best under sink reverse osmosis water filters of 2025

Save up to 38% off

Best Choice

1

Clicked 1,019 times in the last month

Waterdrop
Waterdrop G3P600 Reverse Osmosis System, 8 Stage Tankless Reverse Osmosis Water Filter, NSF/ANSI 42 & 58 & 372 Certified, Under Sink RO System, 2:1 Pure to Drain, Smart LED Faucet

20% Off
Main highlights

High Capacity Filtration
600 GPD output with 8-stage filtration for pure water.

Ideal for Home Use
Perfect for kitchens needing efficient, space-saving water purification.

Praised for Taste
Customers love the clean, bottled-water taste.
9.8

Exceptional

Our Rating

9.5
Instruction

9.5
Flavor

9.3
Easy installation
How do we rank?

Powerful technology We scan thousands of products and stores, analyzing reviews to find what matters most to users like you

Careful review Our team ensures quality, value, and fit based on real user feedback

Trusted insights AI and human analysis guide your decisions, reflecting real user priorities
Real users impact

Thousands of users trust our site daily

Based on millions of stores and reviews

Shoppers influence our rankings
Analyzing top stores
Value for Money

2

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, 8K Gallons
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
- Dimensions:3.6 x 3.6 x 12.3 inches
- Contaminants Removed:PFAS, PFOA/PFOS, rust, lead
- Filtration Stages:N/A
- Maintenance Frequency:12 months or 8k gallons
9.7

Exceptional

Our Rating

9.7
Easy installation

9.7
Sheerness

9.5
Instruction
3

Waterdrop
Waterdrop 15UA Under Sink Water Filter System, Reduces Lead, Chlorine, Bad Taste & Odor, Under Counter Water Filter Direct Connect to Kitchen Faucet, NSF/ANSI 42 Certified, 16000 Gallons, USA Tech
Main highlights

Innovative Multistage Filtration
Reduces PFAS, lead, chlorine, and heavy metals for healthier water.

Versatile Installation Options
Ideal for kitchens, bathrooms, RVs, and offices, ensuring pure water everywhere.

Easy Installation Process
Highly praised for quick and simple installation by users.
Key specs
- Installation Type:Under sink, push-to-connect
- Dimensions:3.6 x 3.6 x 16.7 inches
- Contaminants Removed:PFAS, PFOA/PFOS, lead, chlorine
- Filtration Stages:Multistage filtration
- Maintenance Frequency:24 months or 16,000 gallons
9.5

Excellent

Our Rating

9.7
Easy installation

9.7
Sheerness

9.5
Flavor
4

SimPure
SimPure Y7T-BW-A Countertop Reverse Osmosis Water Filter, NSF/ANSI 58 Certified, 100GPD 5 Stage RO Water Filtration System with pH+ Remineralization, Water Purifier with Glass Pitcher, No Installation

38% Off
Main highlights

Advanced Filtration and Mineralization
Removes 99.99% of contaminants while adding calcium, magnesium, and potassium for taste and health.

Perfect for Versatile Locations
Ideal for homes, offices, and travel with its portable design and no installation needs.

High Water Efficiency Praised
Achieves a 4:1 pure to drain ratio, saving up to 1500 gallons more water.
Key specs
- Installation Type:No installation required
- Dimensions:18.02 x 8 x 17 inches
- Contaminants Removed:Viruses, bacteria, chemicals
- Filtration Stages:Reverse osmosis, mineralization
- Maintenance Frequency:528 gallons per filter
9.4

Excellent

Our Rating
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.
9.3

Excellent

Our Rating

9.3
Flavor

9.1
Instruction

9.1
worth the money
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6

Waterdrop
Waterdrop UA-5Y 𝟓 𝐘𝐞𝐚𝐫𝐬 Under Sink Water Filter System, Ultra Long Life, Reduces Lead, Chlorine, Bad Taste & Odor, Water Filter for Sink Faucet Direct Connect to Kitchen Faucet, USA Tech
Main highlights

Durable and Economical
The Waterdrop UA-5Y offers a 5-year lifespan, reducing frequent replacements and saving money.

Ideal for Chlorine Reduction
Perfect for households wanting to eliminate chlorine taste and improve water quality.

Easy Installation Praised
Customers appreciate the straightforward setup process and complete installation kit.
Key specs
- Installation Type:Under sink, 3-minute setup
- Dimensions:3.9 x 3.6 x 16.7 inches
- Contaminants Removed:Chlorine, PFOA/PFOS, taste, odor
- Filtration Stages:N/A
- Maintenance Frequency:5 years
9.2

Excellent

Our Rating
7

SimPure

SimPure DC5S 40 Micron Spin Down Sediment Filter, Reusable Whole House Sediment Water Filter Softener with Siliphos Helps Prevent Scale and Corrosion, 1" MNPT + 3/4" FNPT + 3/4"MNPT, BPA Free
9.1

Excellent

Our Rating
8

VIOMI
VIOMI® 4-Years RO Water Filtration System, 9 Stage Reverse Osmosis Water Filter, 600GPD, NSF/ANSI 372&53&42 Certified, 3:1 Tankless Reverse Osmosis System Under Sink with Faucet,TDS PFOS&PFOA Reduce
Main highlights

Superior Filtration Efficiency
Viomi RO system reduces TDS by 94.75% and PFOS/PFOA by 99.60%.

Ideal for Home Kitchens
Perfect for families seeking clean, purified drinking water.

Praised for Easy Installation
Customers appreciate the quick and tool-free filter replacement process.
Key specs
- Installation Type:Under Sink
- Dimensions:16.3L x 5.04W x 12.76H
- Contaminants Removed:Lead, fluoride, arsenic
- Filtration Stages:9-Stage Filtration
- Maintenance Frequency:Replace every 6-12 months
9.0

Excellent

Our Rating
9

APEC WATER
APEC Water Systems ROES-50 Essence Series Top Tier 5-Stage WQA Certified Ultra Safe Reverse Osmosis Drinking Water Filter System

20% Off
Main highlights

Comprehensive Water Filtration
Removes up to 99% of impurities, including arsenic, chlorine, and lead for superior water quality.

Ideal for Home Use
Perfect for tap and well water, offering unlimited clean water superior to bottled options.

Highly Praised Water Taste
Customers love the crisp, refreshing taste, often exceeding expectations.
Key specs
- Installation Type:Under-sink
- Dimensions:16 x 5.25 x 17.5 inches
- Contaminants Removed:Arsenic, chlorine, lead, fluoride
- Filtration Stages:5 stages
- Maintenance Frequency:N/A
8.8

Very Good

Our Rating

9.7
worth the money

9.7
Flavor

9.3
Instruction
10

Waterdrop
Waterdrop G2 Reverse Osmosis System, 7 Stage Tankless RO Water Filter System, Under Sink Water Filtration System, 400 GPD, 1:1 Pure to Drain, Reduces TDS, FCC Listed, USA Tech, WD-G2-W

26% Off
Main highlights

Efficient Filtration and Space Saving
The G2 system offers advanced filtration and a compact, tankless design for efficient water purification and space savings.

Ideal for Homes with High TDS
Perfect for homes needing to reduce high TDS levels, ensuring clean, bottled-water taste.

Highly Praised Installation Ease
Customers frequently praise the system's straightforward and quick installation process.
8.7

Very Good

Our Rating

9.5
Easy installation

9.5
Flavor

9.1
Instruction

10 Best under sink reverse osmosis water filters of 2025

1

Waterdrop G3P600 Reverse Osmosis System, 8 Stage Tankless Reverse Osmosis Water Filter, NSF/ANSI 42 & 58 & 372 Certified, Under Sink RO System, 2:1 Pure to Drain, Smart LED Faucet

9.5

9.5

9.3

How do we rank?

How do we rank?

Analyzing top stores

2

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, 8K Gallons

9.7

9.7

9.5

3

Waterdrop 15UA Under Sink Water Filter System, Reduces Lead, Chlorine, Bad Taste & Odor, Under Counter Water Filter Direct Connect to Kitchen Faucet, NSF/ANSI 42 Certified, 16000 Gallons, USA Tech

9.7

9.7

9.5

4

SimPure Y7T-BW-A Countertop Reverse Osmosis Water Filter, NSF/ANSI 58 Certified, 100GPD 5 Stage RO Water Filtration System with pH+ Remineralization, Water Purifier with Glass Pitcher, No Installation

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 UA-5Y 𝟓 𝐘𝐞𝐚𝐫𝐬 Under Sink Water Filter System, Ultra Long Life, Reduces Lead, Chlorine, Bad Taste & Odor, Water Filter for Sink Faucet Direct Connect to Kitchen Faucet, USA Tech

7

SimPure DC5S 40 Micron Spin Down Sediment Filter, Reusable Whole House Sediment Water Filter Softener with Siliphos Helps Prevent Scale and Corrosion, 1" MNPT + 3/4" FNPT + 3/4"MNPT, BPA Free

8

VIOMI® 4-Years RO Water Filtration System, 9 Stage Reverse Osmosis Water Filter, 600GPD, NSF/ANSI 372&53&42 Certified, 3:1 Tankless Reverse Osmosis System Under Sink with Faucet,TDS PFOS&PFOA Reduce

9

APEC Water Systems ROES-50 Essence Series Top Tier 5-Stage WQA Certified Ultra Safe Reverse Osmosis Drinking Water Filter System

9.7

9.7

9.3

10

Waterdrop G2 Reverse Osmosis System, 7 Stage Tankless RO Water Filter System, Under Sink Water Filtration System, 400 GPD, 1:1 Pure to Drain, Reduces TDS, FCC Listed, USA Tech, WD-G2-W

9.5

9.5

9.1

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SimPure UV Tankless Reverse Osmosis System T1-400UV, NSF/ANSI 58 Certified, Under Sink RO Water Filter System 400 GPD, 8 Stage Water Filtration Near 0 TDS, Built-in Pump, BPA Free, 1.5:1 Pure to Drain

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Ecoviva Under Sink Reverse Osmosis System, Fast Dispense Mode, No Drilling Required, 8-Stage Water Filtration System, 600 GPD Water Purifier, 2.5:1 Pure to Drain, Reduce PFAS, NSF/ANSI 58 Certified

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