Refurbished Under-Sink & Countertop Filtration — 58 Deals

58 open-box and refurbished Under-Sink & Countertop Filtration deals are live for shoppers in the US right now, with discounts averaging 29% off retail. Prices range from $8 to $955, and every listing shows the seller's condition grade, current price, savings versus list price and stock status — so you can compare before you buy. Top brands on sale include Brio, Waterdrop, Aquaboon and Aquasana. Inventory syncs from Amazon and other partner stores throughout the day; open-box stock is usually one-of-a-kind, so the best deals sell out fast.

58 live US listings.

USA

3M TFS450 Reverse Osmosis Water Filtration System

$954⁶²

Brio 3-Stage Instant Hot Water Undersink Dispenser System with Dual Flow Faucet in Brushed Gold, Dispenses Hot & Room, NSF/ANSI 42, 53, 61 & 372, Filters Included

$424⁰¹

Brio 3-Stage Digital Instant Hot Water Undersink Dispenser System with Dual Flow Faucet in Rose Gold, Dispenses Hot & Room, NSF/ANSI 42, 53, 61 & 372, Filters Included

$530⁴⁵

Brio 3-Stage Instant Hot Water Undersink Dispenser System with Dual Flow Faucet in Chrome Plated, Dispenses Hot & Room, NSF/ANSI 42, 53, 61 & 372, Filters Included

$517⁴⁹

Waterdrop X12-WCS RO Water Filter, NSF/ANSI 42&58&372 Certified, 1200 GPD Undersink Reverse Osmosis System, 10-Stage Filtration, 3:1 Pure to Drain, Smart Faucet, BPA Free, [ NO Minerals Added ]

$610²⁵

Delta Faucet Clarifi Under Sink Reverse Osmosis Water Filter System, 6-Stage RO Water Filter, Tankless Water Filtration System, Undersink Water Filter, Reverse Osmosis Filter System, DWQ1001012

$440²⁶

Kind Water 6-Stage Reverse Osmosis Drinking Water System with (Brushed Nickel Faucet (Brushed Nickel)

$120⁰⁷

Aquaboon 3-Stage Whole House Water Filter System with 5 Micron 20x4.5 Anti-Scale Reducing Sediment, KDF Heavy Metals and Carbon Chlorine Reduction Water Filter Purification, Wrench, Bracket

$350¹⁸

Waterdrop X8-PRO Dual Flow Reverse Osmosis Water Filter, 800 GPD Tankless RO System, 9-Stage Filtration, Undersink, LED Faucet, BPA Free, Attaches to Your Existing Kitchen Faucet, NO Minerals Added

$498¹⁸

iSpring RCD100HCG Hot & Cold Reverse Osmosis System Countertop, Alkaline RO Water Filter Dispenser, 9 Temperature & 6 Dispensing Volume Options, TDS & Filter Lifespan Monitor, Plug and Play

$410⁵⁷

Max Water Brackish Water RO Membrane Element-BW-4040 2400 GPD, Commercial Reverse Osmosis size 4" x 40" good for Industrial, Municipal, Waste Water Re-Use, Car Wash, Whole House etc. (Pack of 4)

$314²⁹

Brio SIMPL W2 Countertop Water Dispenser w/Refillable 2.5L Water Tank, 2-in-1 Sediment & Carbon Filter Included, Room Temp., LED Display w/Touch Buttons, No Plumbing Necessary, White

$84²¹

iSpring US21B-PF 2-Stage Under Sink Water Filter System, No Drilling Required, SGS-Tested to Removes up to 99% PFAS, Reduces Sediment, Chlorine, Taste & Odor, Up to 50,000 Gallons

$235⁸²

Aquasana Under Sink Water Filter | 3-Stage Max Flow Filtration | Reduces up to 99.99% of 78 Contaminants - PFAS, Lead, Chlorine, Cysts, & More | Under Counter Drinking Water Filter | AQ-6300M-NF

$100⁶⁹

MIZUDO Tankless Reverse Osmosis Water Filter, 1000GPD RO System, Smart WiFi

$801⁸⁹

Frizzlife Reverse Osmosis Water Filter - Alkaline Mineral pH+, NSF/ASNI 58&53&42&372 Standard, 600GPD Tankless RO Reverse Osmosis System, Under Sink, 2:1 Pure to Drain, Smart LED Faucet, PD600-N

$376¹⁹

Waterdrop G5P700A-Pro Alkaline Mineral pH+ Reverse Osmosis Water Filter, NSF/ANSI 58 & 372 Certified, 8 Stage Dual Flow Reverse Osmosis System, 700 GPD RO Water Filtration System, LED Faucet

$328³³

HYDROVOS Tankless RO System 600 GPD, NSF 372 Certified No-Lead, Reduces PFAS, TDS, Fluoride, Arsenic, Chlorine, Efficient 2:1 Drain Ratio, Under Sink Reverse Osmosis Water Filter, USA Tech Support

$118⁴⁵

3M Aqua-Pure Whole House Sanitary Quick Change Water Filter System AP904, Reduces Sediment, Chlorine Taste and Odor, and Scale, Heavy Duty, 100,000 Gallon

$341⁶⁰

Aquaboon 3-Stage Whole House Water Filter System with 5 Micron 20x4.5 Anti-Scale Reducing Sediment Water Purification and Carbon Chlorine Reduction Filter, Pressure Gauges, Wrench, Bracket

$241²²

Frizzlife 1200GPD Reverse Osmosis Water Filter, NSF/ANSI 42&58&372 Standards, 11-Stage Tankless RO Water Filtration System, Under Sink, 3:1 Pure to Drain, Smart Faucet, Reduce PFAS, BPA Free, PD1200

$613⁶¹

BLANCO 443275 Under Sink Water Filtration System - Microplastic S Filter

$147⁸⁴

Delta Clarifi Advanced 2 Stage Under Sink Water Filter System, Water Filter for Kitchen Sink Beverage Faucet, DWQ3502020

$156⁷³

Waterdrop KJ600 Reverse Osmosis System, Instant Hot Water Dispenser, 600 GPD, Reduce PFAS, Tankless, 2:1 Pure to Drain, Under Sink, TDS Reduction, Smart Faucet, Hot and Cold Water Dispenser Faucet

$540⁴⁷

Under-Sink & Countertop Filtration open-box FAQ

How much can I save on open-box Under-Sink & Countertop Filtration?

Discounts on Under-Sink & Countertop Filtration at OpenBoxFox currently average 29% off retail across 58 live listings, with prices from $8 to $955. Savings are measured against the manufacturer's list price.

Are open-box and refurbished Under-Sink & Countertop Filtration safe to buy?

Yes — every listing shows the seller's condition grade (from open-box "Like New" to certified refurbished) before you buy. You purchase directly from the seller, such as Amazon, and that seller's standard return policy applies to your order.

Which Under-Sink & Countertop Filtration brands are on sale open-box right now?

The most-listed brands in Under-Sink & Countertop Filtration at the moment are Brio, Waterdrop, Aquaboon, Aquasana and DELTA. New open-box inventory arrives daily, so brand availability changes often.

How often are Under-Sink & Countertop Filtration deals updated?

OpenBoxFox syncs Under-Sink & Countertop Filtration inventory from partner stores throughout the day. Sold-out listings are removed automatically and new deals appear shortly after we find them.

Shop more: Refurbished Tools & Home Improvement · Refurbished Kitchen & Bath Fixtures · Refurbished Water Filtration & Softeners