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10 Best under sink alkaline water filters of 2025
Save up to 38% off
Best Choice1
SimPureSimPure T1-400ALK Alkaline UV Reverse Osmosis System, NSF/ANSI 58 Certified, Tankless RO Water Filter System 400 GPD, pH+ Remineralization Water Filtration Under Sink, BPA Free, Built-in Pump
22% OffKey specs-
Filtration Stages:Alkaline remineralization, UV sterilizer
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Flow Rate:400 GPD
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Tank Capacity:Tankless design
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Installation Type:Under-sink
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Dimensions:15.6 x 5.3 x 15.7 inches
9.9Exceptional
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Value for Money2
WaterdropWaterdrop G5P500A Alkaline Mineral pH+ Reverse Osmosis Water Filter, NSF/ANSI 372 Certified, 8 Stage Reverse Osmosis System, 500G RO Water Filtration System, 2:1 Pure to Drain, Reduces TDS, BPA Free
9.8Exceptional
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3
WaterdropWaterdrop 10UB-ALK Alkaline Under Sink Water Filter, Reduces Chlorine, Bad Taste & Odor, 6-12 months, Under Sink Water Filter System with Faucet, Easy Installation
9.7Exceptional
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4
iSpringiSpring RCC7AK, NSF Certified, 75 GPD, Alkaline 6-Stage Reverse Osmosis System, pH+ Remineralization RO Water Filter System Under Sink, Patented Top-Mounted Faucet Design for Easy Installation
16% Off9.6Exceptional
Our Rating
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5
WaterdropWaterdrop TSB-ALK 8 Layer High Capacity Slightly Alkaline Under Sink Water Filter, Reduces PFAS, PFOA/PFOS, Fluoride, Chlorine, Bad Taste & Odor, with Dedicated Faucet, Under Sink Water Filter
25% Off9.5Excellent
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6
EXPRESS WATERExpress Water Reverse Osmosis Alkaline Water Filtration System – 10 Stage RO Water Filter with Faucet and Tank – Under Sink Water Filter with Alkaline Filter for Added Essential Minerals – 50 GPD
29% Off9.2Excellent
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7
WINGSOLWINGSOL WINGSOL Under Sink Alkaline Water Filter, 10-Layer Water Filter System Reduces Heavy Metals, Chlorine, Sediment, Improves pH and Taste, Remineralization, NSF Certified Sink
9.1Excellent
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8
APEC WATERAPEC Water Systems ROES-PH75 Essence Series Top Tier Alkaline Mineral pH+ 75 GPD 6-Stage Certified Ultra Safe Reverse Osmosis Drinking Water Filter System
17% Off9.0Excellent
Our Rating
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9
WaterdropWaterdrop Alkaline Water Filter System for Sink WD-ALK16, Mineralizing Water to 9.5 pH, NSF/ANSI 372 Certified, Compatible with Reverse Osmosis Systems, Under Sink Installation
20% Off8.8Very Good
Our Rating
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10
iSpringiSpring FA15 Alkaline Inline Water Filter Cartridge, 10” x 2” with 1/4” Quick Connect, NSF Certified, Add-on for RO Systems, Balances pH & Restores Minerals, 3-Layer Replacement Filter
38% Off8.7Very Good
Our Rating
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