Best Reverse Osmosis Filters
Updated May 2025
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Best Reverse Osmosis Filters
2025 Buyer's GuideUpdated May 2025
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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
iSpring RCC7, NSF Certified, High Capacity Under Sink 5-Stage Reverse Osmosis Water Filter, RO Drinking System, 75 GPD, Brushed...
Type: Under sink
Filtration Process: 5-stage with reverse osmosis
Pure to Drain Ratio: 1:2 or 1:3
Flow Rate: 75 gallons per day
Dimensions: 15.5" wide x 5.3" deep x 17.5" tall
2
iSpring RCC7, NSF Certified, High Capacity Under Sink 5-Stage Reverse Osmosis Water Filter, RO Drinking System, 75 GPD, Brushed...
Type: Under sink
Filtration Process: 5-stage with reverse osmosis
Pure to Drain Ratio: 1:2 or 1:3
Flow Rate: 75 gallons per day
Dimensions: 15.5" wide x 5.3" deep x 17.5" tall
3
3
SimPure Q3-600 Tankless Reverse Osmosis System, Under Sink Water Filter System 600 GPD, 7 Stage Electric RO Water Filtration, R...
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
4
WATERDROP
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
Pure to Drain Ratio: 3:1
Flow Rate: 800 gallons per day
Dimensions: 5.7" wide x 17.7" deep x 18.1" tall
4
Waterdrop G3P800 Reverse Osmosis System, 800 GPD Fast Flow, NSF/ANSI 42 & 53 & 58 & 372 Certified, 3:1 Pure to Drain, Tankless ...
WATERDROP
Type: Under sink
Filtration Process: 9-stage with reverse osmosis
Pure to Drain Ratio: 3:1
Flow Rate: 800 gallons per day
Dimensions: 5.7" wide x 17.7" deep x 18.1" tall
5
5
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
Pure to Drain Ratio: 1:3
Flow Rate: 75 gallons per day
Dimensions: 15.5" wide x 5.1" deep x 19.5" tall
6
WATERDROP
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
Pure to Drain Ratio: 2:1
Flow Rate: 600 gallons per day
Dimensions: 5.9" wide x 14" deep x 17.3" tall
6
Waterdrop G2P600 Reverse Osmosis System, 600 GPD Tankless RO Water Filter System, Under Sink RO System, 7 Stage Filtration, 2:1...
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
7
7
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
8
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
8
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
9
9
SimPure UV Tankless Reverse Osmosis System T1-400UV, NSF/ANSI 58 Certified, Under Sink RO Water Filter System 400 GPD, 8 Stage ...
Type: Under sink
Filtration Process: 8-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
10
10
SimPure Alkaline UV Reverse Osmosis System T1-400ALK, NSF/ANSI 58 Certified, Tankless RO Water Filter System 400 GPD, pH+ Remin...
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
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
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