Best Reverse Osmosis Filters
Updated February 2025
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 Reverse Osmosis Filters
2025 Buyer's GuideUpdated February 2025
Sort by:
1
WATERDROP
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
Pure to Drain Ratio: 2:1
Flow Rate: 0.42 gallons per minute
Dimensions: 5.7" wide x 18.1" deep x 17.7" tall
1
Waterdrop G3P600 Reverse Osmosis System, 8 Stage Tankless Reverse Osmosis Water Filter, NSF/ANSI 42 & 58 & 372 Certified, Under...
WATERDROP
Type: Under sink
Filtration Process: 8-stage with reverse osmosis
Pure to Drain Ratio: 2:1
Flow Rate: 0.42 gallons per minute
Dimensions: 5.7" wide x 18.1" deep x 17.7" tall
2
SIMPURE
SimPure Y7P-BW UV Countertop Reverse Osmosis Water Filter, NSF/ANSI 58 Certified, 4 Stage RO Water Filtration System, Water Pur...
Type: Countertop
Filtration Process: 4-stage with reverse osmosis
Pure to Drain Ratio: 4:1
Flow Rate: 418 gallons per day
Dimensions: 10" wide x 19" deep x 19" tall
2
SimPure Y7P-BW UV Countertop Reverse Osmosis Water Filter, NSF/ANSI 58 Certified, 4 Stage RO Water Filtration System, Water Pur...
SIMPURE
Type: Countertop
Filtration Process: 4-stage with reverse osmosis
Pure to Drain Ratio: 4:1
Flow Rate: 418 gallons per day
Dimensions: 10" wide x 19" deep x 19" tall
3
Waterdrop X12-Alkaline Mineral pH+ Reverse Osmosis System, NSF/ANSI 42&58&372 Certified, 1200 GPD RO Water Filter, 11-Stage Fil...
Type: Under sink
Filtration Process: 11-stage with reverse osmosis
Pure to Drain Ratio: 3:1
Flow Rate: 1200 gallons per day
Dimensions: 6.3" wide x 18.2" deep x 16.7" tall
3
Waterdrop X12-Alkaline Mineral pH+ Reverse Osmosis System, NSF/ANSI 42&58&372 Certified, 1200 GPD RO Water Filter, 11-Stage Fil...
Type: Under sink
Filtration Process: 11-stage with reverse osmosis
Pure to Drain Ratio: 3:1
Flow Rate: 1200 gallons per day
Dimensions: 6.3" wide x 18.2" deep x 16.7" tall
4
WATERDROP
Waterdrop G2 Reverse Osmosis System, 7 Stage Tankless RO Water Filter System, Under Sink Water Filtration System, 400 GPD, 1:1 ...
Type: Under sink
Filtration Process: 7-stage with reverse osmosis
Pure to Drain Ratio: 1:1
Flow Rate: 400 gallons per day
Dimensions: 5.9" wide x 17.3" deep x 14" tall
4
Waterdrop G2 Reverse Osmosis System, 7 Stage Tankless RO Water Filter System, Under Sink Water Filtration System, 400 GPD, 1:1 ...
WATERDROP
Type: Under sink
Filtration Process: 7-stage with reverse osmosis
Pure to Drain Ratio: 1:1
Flow Rate: 400 gallons per day
Dimensions: 5.9" wide x 17.3" deep x 14" tall
5
5
SimPure Alkaline UV Reverse Osmosis System, NSF/ANSI 58 Certified, Tankless RO Water Filter System 400 GPD, pH+ Remineralizatio...
Type: Under sink
Filtration Process: 4-stage with reverse osmosis
Pure to Drain Ratio: 1.5:1
Flow Rate: 400 gallons per day
Dimensions: 9" wide x 16" deep x 18" tall
6
6
SimPure Q3-600 Tankless Reverse Osmosis System, Under Sink Water Filter System 600 GPD, 7 Stage RO Water Filtration, NSF/ANSI 5...
Type: Under sink
Filtration Process: 7-stage with reverse osmosis
Pure to Drain Ratio: 2:1
Flow Rate: 600 gallons per day
Dimensions: 6" wide x 12.5" deep x 13.5" tall
7
7
Bluevua RO100ROPOT-UV Reverse Osmosis System Countertop Water Filter - 6 Stage Purification with UV and Remineralization, Count...
Type: Countertop
Filtration Process: 6-stage with reverse osmosis
Pure to Drain Ratio: 2:1
Flow Rate: Not indicated
Dimensions: 10.8" wide x 14" deep x 15.5" tall
8
8
Waterdrop 10UA Under Sink Water Filter System, Reduces PFAS, PFOA/PFOS, Lead, Chlorine, Bad Taste & Odor, Under Counter Water F...
Type: Under sink
Filtration Process: Single stage
Pure to Drain Ratio: Not indicated
Flow Rate: 2.5 gallons per minute
Dimensions: 3.6" wide x 3.9" deep x 12.3" tall
9
WATERDROP
Waterdrop G2P600 Reverse Osmosis System, 600 GPD Reverse Osmosis Water Filter, 7 Stage Tankless RO Water Filter System, Under S...
Type: Under sink
Filtration Process: 7-stage with reverse osmosis
Pure to Drain Ratio: 2:1
Flow Rate: 600 gallons per day
Dimensions: 5.9" wide x 14" deep x 17.3" tall
9
Waterdrop G2P600 Reverse Osmosis System, 600 GPD Reverse Osmosis Water Filter, 7 Stage Tankless RO Water Filter System, Under S...
WATERDROP
Type: Under sink
Filtration Process: 7-stage with reverse osmosis
Pure to Drain Ratio: 2:1
Flow Rate: 600 gallons per day
Dimensions: 5.9" wide x 14" deep x 17.3" tall
10
10
iSpring RCC7P-AK, NSF/ANSI 58 Certified, 6-Stage Reverse Osmosis System Under Sink Alkaline Water Filter and Pump, RO Drinking ...
Type: Under sink
Filtration Process: 6-stage with reverse osmosis
Pure to Drain Ratio: 1:1.5
Flow Rate: 75 gallons per day
Dimensions: 15" wide x 8" deep x 18" tall
We also considered 9 others:
Our Top Choice
1
WATERDROP
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
Pure to Drain Ratio: 2:1
Flow Rate: 0.42 gallons per minute
Dimensions: 5.7" wide x 18.1" deep x 17.7" tall
1
Waterdrop G3P600 Reverse Osmosis System, 8 Stage Tankless Reverse Osmosis Water Filter, NSF/ANSI 42 & 58 & 372 Certified, Under...
WATERDROP
Type: Under sink
Filtration Process: 8-stage with reverse osmosis
Pure to Drain Ratio: 2:1
Flow Rate: 0.42 gallons per minute
Dimensions: 5.7" wide x 18.1" deep x 17.7" tall
Compare Features
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.
1,000,000+ shoppers use Buyer's Guide every week to find the best products and services online.
Learn more about our rankings.
Helping millions of users make smarter purchases online.
