10 Best Under Sink Reverse Osmosis Water Filters 2024 in the US

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Trusted certifications: NSF/ANSI 58, 372, 42, FCC, EU, UKCA certified.

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8-stage filtration: Reduces TDS, chromium, PFAS, and more.

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Smart display faucet: TDS monitor and filter life tracker included.

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High capacity, low drain ratio: 600 gallons/day, 2:1 low drain ratio.

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Tankless design: Saves 70% under sink space, easy filter change.

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NSF/ANSI Certified: Certified for TDS reduction, chlorine, taste, odor, and lead-free materials.

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800 GPD Capacity: High capacity of 800 gallons per day with a 3:1 pure to drain ratio.

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10-Stage Filtration: Reduces PFAS, fluoride, heavy metals, salts, and radioactive substances.

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Smart Faucet: Displays TDS level and water quality; LED lifespan up to 50 years.

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Tankless Design: Stylish, space-saving design ensures consistent water purity.

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Supreme Quality: Designed, engineered, and assembled in the USA to ensure water safety and health.

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High Contaminant Removal: Uses technology that removes up to 99% of impurities including arsenic, chlorine, lead, fluoride, heavy metals, and over 1000 other contaminants.

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WQA Certified: Water Quality Association certified system with premium long-lasting filters suitable for treating tap and well water.

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Unlimited Clean Water: Provides unlimited refreshing and crisp tasting water, superior to bottled water quality.

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Top Rated Brand: America's No.1 rated water filter brand with a 20-year track record of trouble-free, noise-free systems for long-lasting, dependable, pure drinking water.

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NSF/ANSI 372 Certified: Ensures lead-free materials for safe water.

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7-stage filtration: Advanced filtration for pure, clean water.

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600 GPD fast water flow: Produces 600 gallons of filtered water daily.

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2:1 low drain ratio: Saves 600% more water than traditional systems.

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Easy installation: Install in 30 minutes with twist-and-pull filters.

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NSF/ANSI 58 Certified: Ensures the system meets rigorous health and safety standards, removing up to 99% of over 1,000 contaminants.

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6-Stage Alkaline Filtration: Restores natural alkalinity and mineral balance of water, providing healthier and great-tasting mineral water.

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Low Maintenance: Features transparent 1st stage housing for easy inspection and long-life pre-filters for protection of the RO membrane.

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Easy DIY Installation: Designed for simple installation with clear manual and instructional videos, including quick-fitting connectors for a leak-free setup.

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High Capacity: Capable of producing 75 gallons per day, ensuring ample clean water for large families or busy households.

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NSF/ANSI 372 Certified: Certified for lead-free materials ensuring safety.

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7-Stage Filtration: Reduces TDS, PFAS, PFOA, PFOS, and more.

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400 GPD & 1:1 Drain Ratio: Fast water flow with low water waste.

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Tankless Design: Saves space and ensures water safety.

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Easy Installation: Quick filter replacement and setup in under 30 minutes.

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600 GPD & 2:1 low drain ratio: High flow rate with efficient water use.

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6-stage composite filter: Reduces pollutants with 0.0001μm filtration.

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Smart designer faucet: Displays TDS level and filter life on screen.

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Tankless design: Saves 70% under-sink space, prevents recontamination.

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Easy installation: DIY setup in 30 minutes, quick filter replacement.

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Innovative RO System Design: Solves common problems associated with traditional canister and tankless reverse osmosis systems.

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Luxury & Performance Upgrades: Includes a brushed nickel RO faucet, fridge connection kit, and a high-performance Dow Filmtec RO membrane.

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EPA Registered UV Sterilizer: Approved to kill or suppress viruses, bacteria, and fungi, ensuring safe water purification.

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Patented Remineralization System: Adds essential minerals like calcium and magnesium for great tasting mineral water and reduced tank degradation.

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Comprehensive 9-Stage Filtration: Removes up to 99% of contaminants including chlorine, chemicals, lead, heavy metals, and microplastics.

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Certified Safety: NSF/ANSI 58 and 372 certified for TDS reduction and lead-free material.

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Advanced Filtration: 9-stage filtration with 0.0001μm RO membrane for water purity.

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Tankless Design: Compact system saves 70% undersink space and easy filter replacement.

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Efficient Water Use: Filters 800 gallons/day with a 2:1 low drain ratio for minimal waste.

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Smart Monitoring: Real-time TDS monitoring and filter life reminders for maintenance.

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High Contaminant Reduction: Reduces up to 99.99% of harmful contaminants including Lead, Chlorine, Fluoride, Nitrates, and more.

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Comprehensive 5-Stage Filtration: Engineered to work together, providing the safest and best tasting water.

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Easy DIY Installation: Designed for quick, simple installation without the need for professional help.

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Automatic Tank Refill: Automatically fills the water tank with high quality drinking water without manual intervention.

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Leak Detection: Includes an emergency leak stop detector to shut off water flow in case of moisture detection.