Best Water Filtration Systems Updated May 2025
Advertiser disclosure About our rankings

Join the millions that have trusted BuyersGuide.org to help them make smarter buying decisions. Let our independent expert reviews and data-driven shopping recommendations help you find the one that's right for you.

Best Water Filtration Systems
2025 Buyer's GuideUpdated May 2025
Advertiser disclosure About our rankings
Sort by:
Best Water Filtration System

10.0

1

10.0

Waterdrop G3P600 Reverse Osmosis System, 8 Stage Tankless Reverse Osmosis Water Filter, NSF/ANSI 42 & 58 & 372 Certified, Under...
Type: Under sink
Filtration Process: 8-stage with reverse osmosis
Filter Lifespan: 2,200 gallons
Flow Rate: 0.42 gallons per minute
Dimensions: 5.7" wide x 18.1" deep x 17.7" tall
Read Full Review
$110 Coupon
Compare
Picked by 1116 people this week!
$110 Coupon
Compare
Picked by 1116 people this week!
Picked by 1116 people this week!
Best Water Filtration System

10.0

1
Waterdrop G3P600 Reverse Osmosis System, 8 Stage Tankless Reverse Osmosis Water Filter, NSF/ANSI 42 & 58 & 372 Certified, Under...
Type: Under sink
Filtration Process: 8-stage with reverse osmosis
Filter Lifespan: 2,200 gallons
Flow Rate: 0.42 gallons per minute
Dimensions: 5.7" wide x 18.1" deep x 17.7" tall
Picked by 1116 people this week!
$110 Coupon
Compare
Read Full Review
Best Value
Popular

9.9

2

9.9

Membrane Solutions Portable Water Filter Straw Filtration Straw Purifier Survival Gear for Hiking, Camping, Travel, and Emergen...
Type: Portable
Filtration Process: 5-stage
Filter Lifespan: 1,320 gallons
Flow Rate: 16.9 ounces per minute
Dimensions: 3.5" diameter x 7.4" tall
20% Coupon
Compare
20% Coupon
Compare
Best Value
Popular

9.9

2
Membrane Solutions Portable Water Filter Straw Filtration Straw Purifier Survival Gear for Hiking, Camping, Travel, and Emergen...
Type: Portable
Filtration Process: 5-stage
Filter Lifespan: 1,320 gallons
Flow Rate: 16.9 ounces per minute
Dimensions: 3.5" diameter x 7.4" tall
20% Coupon
Compare

9.7

3

9.7

Waterdrop TSU 0.01μm Ultra-Filtration Under Sink Water Filter System, 3-Stage Tankless Undersink Water Filtration with Faucet, ...
Type: Under sink
Filtration Process: 3-stage
Filter Lifespan: 2,200 gallons
Flow Rate: Not indicated
Dimensions: 4.7" wide x 14.8" deep x 14" tall
Read Full Review
Save 5% + $40 Coupon
Compare
Save 5% + $40 Coupon
Compare

9.7

3
Waterdrop TSU 0.01μm Ultra-Filtration Under Sink Water Filter System, 3-Stage Tankless Undersink Water Filtration with Faucet, ...
Type: Under sink
Filtration Process: 3-stage
Filter Lifespan: 2,200 gallons
Flow Rate: Not indicated
Dimensions: 4.7" wide x 14.8" deep x 14" tall
Save 5% + $40 Coupon
Compare
Read Full Review

9.6

4

9.6

iSpring RCC7AK, NSF Certified, 75 GPD, Alkaline 6-Stage Reverse Osmosis System, pH+ Remineralization RO Water Filter System Und...
Type: Under sink
Filtration Process: 6-stage with reverse osmosis
Filter Lifespan: 1,500 gallons
Flow Rate: 75 gallons per day
Dimensions: 15.5" wide x 5.1" deep x 19.5" tall
Read Full Review
Save 14%
Compare
Save 14%
Compare

9.6

4
iSpring RCC7AK, NSF Certified, 75 GPD, Alkaline 6-Stage Reverse Osmosis System, pH+ Remineralization RO Water Filter System Und...
Type: Under sink
Filtration Process: 6-stage with reverse osmosis
Filter Lifespan: 1,500 gallons
Flow Rate: 75 gallons per day
Dimensions: 15.5" wide x 5.1" deep x 19.5" tall
Save 14%
Compare
Read Full Review

9.5

5

9.5

SimPure Y7P-BW UV Countertop Reverse Osmosis Water Filter, NSF/ANSI 58 Certified, 5 Stage RO Water Filtration System, Water Pur...
Type: Countertop
Filtration Process: 4-stage with reverse osmosis
Filter Lifespan: Not indicated
Flow Rate: 418 gallons per day
Dimensions: 10" wide x 19" deep x 19" tall
Read Full Review
Save 41%
Compare
Save 41%
Compare

9.5

5
SimPure Y7P-BW UV Countertop Reverse Osmosis Water Filter, NSF/ANSI 58 Certified, 5 Stage RO Water Filtration System, Water Pur...
Type: Countertop
Filtration Process: 4-stage with reverse osmosis
Filter Lifespan: Not indicated
Flow Rate: 418 gallons per day
Dimensions: 10" wide x 19" deep x 19" tall
Save 41%
Compare
Read Full Review

9.4

6

9.4

NU Aqua 7-Stage (12 Step Filtration) UV & Alkaline Under Sink Reverse Osmosis Water Filter System - 100 GPD RO Filtration & Rem...
Type: Under sink
Filtration Process: 7-stage with reverse osmosis
Filter Lifespan: Not indicated
Flow Rate: 100 gallons per day
Dimensions: 18" wide x 18" deep x 20" tall
Read Full Review
Save 21%
Compare
Save 21%
Compare

9.4

6
NU Aqua 7-Stage (12 Step Filtration) UV & Alkaline Under Sink Reverse Osmosis Water Filter System - 100 GPD RO Filtration & Rem...
Type: Under sink
Filtration Process: 7-stage with reverse osmosis
Filter Lifespan: Not indicated
Flow Rate: 100 gallons per day
Dimensions: 18" wide x 18" deep x 20" tall
Save 21%
Compare
Read Full Review

9.3

7

9.3

Waterdrop G2P600 Reverse Osmosis System, 600 GPD Tankless RO Water Filter System, Under Sink RO System, 7 Stage Filtration, 2:1...
Type: Under sink
Filtration Process: 7-stage with reverse osmosis
Filter Lifespan: 3,300 gallons
Flow Rate: 600 gallons per day
Dimensions: 5.9" wide x 14" deep x 17.3" tall
Read Full Review
$70 Coupon
Compare
$70 Coupon
Compare

9.3

7
Waterdrop G2P600 Reverse Osmosis System, 600 GPD Tankless RO Water Filter System, Under Sink RO System, 7 Stage Filtration, 2:1...
Type: Under sink
Filtration Process: 7-stage with reverse osmosis
Filter Lifespan: 3,300 gallons
Flow Rate: 600 gallons per day
Dimensions: 5.9" wide x 14" deep x 17.3" tall
$70 Coupon
Compare
Read Full Review
Premium Pick

9.2

8

9.2

Waterdrop G3P800 Reverse Osmosis System, 800 GPD Fast Flow, NSF/ANSI 42 & 53 & 58 & 372 Certified, 3:1 Pure to Drain, Tankless ...
Type: Under sink
Filtration Process: 9-stage with reverse osmosis
Filter Lifespan: Not indicated
Flow Rate: 800 gallons per day
Dimensions: 5.7" wide x 17.7" deep x 18.1" tall
Read Full Review
$240 Coupon
Compare
$240 Coupon
Compare
Premium Pick

9.2

8
Waterdrop G3P800 Reverse Osmosis System, 800 GPD Fast Flow, NSF/ANSI 42 & 53 & 58 & 372 Certified, 3:1 Pure to Drain, Tankless ...
Type: Under sink
Filtration Process: 9-stage with reverse osmosis
Filter Lifespan: Not indicated
Flow Rate: 800 gallons per day
Dimensions: 5.7" wide x 17.7" deep x 18.1" tall
$240 Coupon
Compare
Read Full Review

9.1

9

9.1

SimPure Whole House Water Filter System, 3-Stage Clear Home Water Filtration with Sediment Carbon and GAC Filters, Reduce Odor,...
Type: Whole-house
Filtration Process: 3-stage
Filter Lifespan: Not indicated
Flow Rate: 15 gallons per minute
Dimensions: 23.1" wide x 7.7" deep x 28.7" tall
Compare
Compare

9.1

9
SimPure Whole House Water Filter System, 3-Stage Clear Home Water Filtration with Sediment Carbon and GAC Filters, Reduce Odor,...
Type: Whole-house
Filtration Process: 3-stage
Filter Lifespan: Not indicated
Flow Rate: 15 gallons per minute
Dimensions: 23.1" wide x 7.7" deep x 28.7" tall
Compare

9.0

10

9.0

Waterdrop TSA 8 Layer Under Sink Water Filter System, Under Sink Water Filtration System, Reduces PFAS, PFOA/PFOS, Fluoride, Ch...
Type: Under sink
Filtration Process: 3-stage
Filter Lifespan: 8,000 gallons
Flow Rate: 1 gallons per minute
Dimensions: 12.9" wide x 4.3" deep x 16.8" tall
Read Full Review
Save 20% + 5% Coupon
Compare
Save 20% + 5% Coupon
Compare

9.0

10
Waterdrop TSA 8 Layer Under Sink Water Filter System, Under Sink Water Filtration System, Reduces PFAS, PFOA/PFOS, Fluoride, Ch...
Type: Under sink
Filtration Process: 3-stage
Filter Lifespan: 8,000 gallons
Flow Rate: 1 gallons per minute
Dimensions: 12.9" wide x 4.3" deep x 16.8" tall
Save 20% + 5% Coupon
Compare
Read Full Review
We also considered 10 others:

Our Top Choice

Best Water Filtration System

10.0

1

10.0

Waterdrop G3P600 Reverse Osmosis System, 8 Stage Tankless Reverse Osmosis Water Filter, NSF/ANSI 42 & 58 & 372 Certified, Under...
Type: Under sink
Filtration Process: 8-stage with reverse osmosis
Filter Lifespan: 2,200 gallons
Flow Rate: 0.42 gallons per minute
Dimensions: 5.7" wide x 18.1" deep x 17.7" tall
Read Full Review
$110 Coupon
Compare
Picked by 1116 people this week!
$110 Coupon
Compare
Picked by 1116 people this week!
Picked by 1116 people this week!
Best Water Filtration System

10.0

1
Waterdrop G3P600 Reverse Osmosis System, 8 Stage Tankless Reverse Osmosis Water Filter, NSF/ANSI 42 & 58 & 372 Certified, Under...
Type: Under sink
Filtration Process: 8-stage with reverse osmosis
Filter Lifespan: 2,200 gallons
Flow Rate: 0.42 gallons per minute
Dimensions: 5.7" wide x 18.1" deep x 17.7" tall
Picked by 1116 people this week!
$110 Coupon
Compare
Read Full Review

Compare Features

Filtration Process
Best Water Filtration System
1. Waterdrop G3 Reverse Osmosis Water Filtration System
WATERDROP Preview WATERDROP Preview
WATERDROP
at Amazon
Best Value
2. Membrane Solutions Straw Water Filter
MEMBRANE SOLUTIONS Preview MEMBRANE SOLUTIONS Preview
MEMBRANE SOLUTIONS
at Amazon
3. Waterdrop WD-TSU Under Sink Water Filter System
WATERDROP Preview WATERDROP Preview
WATERDROP
at Amazon
4. iSpring RCC7AK RO Water Filtration System
ISPRING Preview ISPRING Preview
ISPRING
at Amazon
5. SimPure Y7P UV RO Water Filtration System
SIMPURE Preview SIMPURE Preview
SIMPURE
at Amazon
6. NU Aqua Platinum Series 7 RO System
NU AQUA Preview NU AQUA Preview
NU AQUA
at Amazon
7. Waterdrop G2P600 RO Water Filtration System
WATERDROP Preview WATERDROP Preview
WATERDROP
at Amazon
Premium Pick
8. Waterdrop G3P800 RO Water Filtration System
WATERDROP Preview WATERDROP Preview
WATERDROP
at Amazon
9. SimPure 3-Stage Whole House Water Filter System
SIMPURE Preview SIMPURE Preview
SIMPURE
at Amazon
10. Waterdrop TSA 3-Stage Under Sink Water Filter
WATERDROP Preview WATERDROP Preview
WATERDROP
at Amazon
Deal
$110 Coupon 20% Coupon Save 5% + $40 Coupon Save 14% Save 41% Save 21% $70 Coupon $240 Coupon — Save 20% + 5% Coupon
Deal $110 Coupon 20% Coupon Save 5% + $40 Coupon Save 14% Save 41% Save 21% $70 Coupon $240 Coupon — Save 20% + 5% Coupon
Type
Under sink Portable Under sink Under sink Countertop Under sink Under sink Under sink Whole-house Under sink
Type 		Under sink Portable Under sink Under sink Countertop Under sink Under sink Under sink Whole-house Under sink
Filtration Process
8-stage with reverse osmosis 5-stage 3-stage 6-stage with reverse osmosis 4-stage with reverse osmosis 7-stage with reverse osmosis 7-stage with reverse osmosis 9-stage with reverse osmosis 3-stage 3-stage
Filtration Process 		8-stage with reverse osmosis 5-stage 3-stage 6-stage with reverse osmosis 4-stage with reverse osmosis 7-stage with reverse osmosis 7-stage with reverse osmosis 9-stage with reverse osmosis 3-stage 3-stage
Filter Lifespan
2,200 gallons 1,320 gallons 2,200 gallons 1,500 gallons Not indicated Not indicated 3,300 gallons Not indicated Not indicated 8,000 gallons
Filter Lifespan 		2,200 gallons 1,320 gallons 2,200 gallons 1,500 gallons Not indicated Not indicated 3,300 gallons Not indicated Not indicated 8,000 gallons
Flow Rate
0.42 gallons per minute 16.9 ounces per minute Not indicated 75 gallons per day 418 gallons per day 100 gallons per day 600 gallons per day 800 gallons per day 15 gallons per minute 1 gallons per minute
Flow Rate 		0.42 gallons per minute 16.9 ounces per minute Not indicated 75 gallons per day 418 gallons per day 100 gallons per day 600 gallons per day 800 gallons per day 15 gallons per minute 1 gallons per minute
Dimensions
5.7" wide x 18.1" deep x 17.7" tall 3.5" diameter x 7.4" tall 4.7" wide x 14.8" deep x 14" tall 15.5" wide x 5.1" deep x 19.5" tall 10" wide x 19" deep x 19" tall 18" wide x 18" deep x 20" tall 5.9" wide x 14" deep x 17.3" tall 5.7" wide x 17.7" deep x 18.1" tall 23.1" wide x 7.7" deep x 28.7" tall 12.9" wide x 4.3" deep x 16.8" tall
Dimensions 		5.7" wide x 18.1" deep x 17.7" tall 3.5" diameter x 7.4" tall 4.7" wide x 14.8" deep x 14" tall 15.5" wide x 5.1" deep x 19.5" tall 10" wide x 19" deep x 19" tall 18" wide x 18" deep x 20" tall 5.9" wide x 14" deep x 17.3" tall 5.7" wide x 17.7" deep x 18.1" tall 23.1" wide x 7.7" deep x 28.7" tall 12.9" wide x 4.3" deep x 16.8" tall

Related Categories
Drinking Water Filtration SystemWater Filter SystemUnder Sink Water FilterUndersink Water Filter SystemReverse Osmosis SystemUnder Sink Reverse Osmosis Filter
How We Rank
Expert Analysis
Our team of experts highlights useful information so you can easily compare products to find the one that's right for you.

Award-Winning Tech
Our technology analyzes thousands of purchase trends to bring you the top product recommendations.

Why Trust Our Reviews?
1,000+ shoppers have used Buyer's Guide in the last week to help find the best Water Filtration Systems.

Learn more about our rankings.

Reliable, Safe & Secure
Helping millions of users make smarter purchases online.
Related Categories
Drinking Water Filtration SystemWater Filter SystemUnder Sink Water FilterUndersink Water Filter SystemReverse Osmosis SystemUnder Sink Reverse Osmosis Filter
Related Categories
Drinking Water Filtration SystemWater Filter SystemUnder Sink Water FilterUndersink Water Filter SystemReverse Osmosis SystemUnder Sink Reverse Osmosis Filter