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Best water filter under sink alkalines - Holiday Sale 2025

Last Updated - December 14, 2025

1
Best Choice

✖
Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

iSpring

iSpring RCC7AK-UV, NSF Certified, 7-Stage Under Sink Reverse Osmosis Water Filtration System with Alkaline Remineralization and UV Filter, Patented Top-Mounted Faucet Design for Easy Installation

iSpring

$335.98

$369.99
(9% Off)

More Details
Main highlights
- WHOLE SYSTEM NSF/ANSI 58 CERTIFIED – This under-sink reverse osmosis water filter is tested and certified by NSF International for the entire system, not just individual components.
- TRUSTWORTHY SUPPORT – America’s favorite RO brand, backed by lifetime technical support in Atlanta, GA, ensuring expert assistance whenever you need it.
- SUPERIOR FILTRATION PERFORMANCE – NSF tested to effectively reduce Asbestos (>99.7%), Barium (98.4%), Cadmium (98.8%), Chromium (99.2%), Copper (97.8%), Fluoride (97.4%), Lead (98.9%), Selenium (99.0%), and TDS (97.9%).
- POWERFUL 11W UV STAGE - This built-in UV filtration stage provides added peace of mind by delivering an extra layer of protection for your drinking water. The system features a smart flow sensor that turns on the UV light only when needed, helping save energy and extend the lamp's life.
- MINERAL BOOST – The natural mineral AK stage delivers spring-like water with a balanced, healthy pH and multiple essential minerals.
- EASY INSTALLATION & COMPATIBILITY - Designed for easy DIY installation with clear instructions. Works with feed water pH levels from 3.0 to 11.0, pressure between 45-70 psi, and temperatures from 40-100°F (4-38°C). Note: This model does not include a booster pump. If needed, search for RCC1UP-AK (B006X3YJKK).
- DURABLE & LOW MAINTENANCE - High-quality components ensure long-lasting reliability with minimal maintenance. The transparent first-stage housing allows for quick and easy filter inspection.
- CONVENIENT REPLACEMENT FILTERS - Easy access to replacement filter sets: F4AK (6-Month), F10KU (1-Year), F21KU75 (2-Year), and F31KU75 (3-Year).
$335.98
$369.99 (9% Off)
2
13% Off

✖
Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

Waterdrop
13% Off

Waterdrop G5P700A Alkaline Mineral pH+ Reverse Osmosis Water Filter, NSF/ANSI 372 Certified, 700G Reverse Osmosis System, 8 Stage RO Water Filtration System, 2:1 Pure to Drain, Smart LED Faucet

Waterdrop

$309.99

$359.99
(13% Off)

More Details
Main highlights
- 𝟖-𝐒𝐭𝐚𝐠𝐞 𝐏𝐫𝐞𝐜𝐢𝐬𝐞 𝐅𝐢𝐥𝐭𝐫𝐚𝐭𝐢𝐨𝐧: Tested by SGS, the reverse osmosis system features an advanced 8-stage filtration process that reduces harmful contaminants such as PFOA, PFOS, chlorine, bad taste and odor, lead, fluoride, heavy metals, and other impurities. Enjoy clean and safe water with Waterdrop G5P700A
- 𝟕𝟎𝟎𝐆𝐏𝐃 𝐇𝐢𝐠𝐡-𝐒𝐩𝐞𝐞𝐝 𝐅𝐥𝐨𝐰: With a robust 700GPD (gallons per day) capacity, the G5P700A provides a consistent and rapid water flow, filling a 6-ounce cup in just 6 seconds. Enjoy immediate access to purified water, perfect for busy households
- 𝟐:𝟏 𝐏𝐮𝐫𝐞-𝐭𝐨-𝐃𝐫𝐚𝐢𝐧 𝐑𝐚𝐭𝐢𝐨: This RO water filtration system offers an impressive 2:1 purified water ratio, generating 400% more clean water compared to conventional systems. This not only reduces costs but also supports environmental sustainability by minimizing water waste
- 𝟎.𝟎𝟎𝟎𝟏μ𝐦 𝐑𝐎 + 𝐀𝐝𝐝𝐞𝐝 𝐌𝐢𝐧𝐞𝐫𝐚𝐥𝐬: The G5P700A combines a precise 0.0001μm RO membrane with alkaline mineralization technology, effectively reducing particles larger than 0.0001μm while enriching water with essential minerals like Ca²⁺, Mg²⁺, Na⁺ and K⁺
- 𝐂𝐨𝐦𝐩𝐚𝐜𝐭 𝐓𝐚𝐧𝐤𝐥𝐞𝐬𝐬 𝐃𝐞𝐬𝐢𝐠𝐧: Say goodbye to large tank systems. The tankless RO system’s modern tankless design frees up to 70% of your under-sink space, making it ideal for today's household spaces. Its slim and stylish build perfectly matches any kitchen style
- Please note: Faucet installation requires drilling holes in the countertop.
- Faucet Dimensions: 5.6" L x 3.2" W x 13" H
$309.99
$359.99 (13% Off)
3
15% Off

✖
Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

iSpring
15% Off

iSpring 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

iSpring

$234.99

$279.00
(15% Off)

More Details
Main highlights
- TRUSTWORTHY SUPPORT – America’s favorite RO brand, backed by lifetime technical support in Atlanta, GA, ensuring expert assistance whenever you need it.
- SEE WHAT’S CAUGHT – The transparent first-stage filter housing makes it easy to monitor contaminant buildup, ensuring timely filter changes.
- PATENTED DESIGN – The top-mounted fastener allows for easy countertop installation entirely from above, eliminating the hassle of tightening the nut from underneath the sink.
- NSF 58 CERTIFIED RO SYSTEM – Unlike other brands that lack NSF certification or full system certification, our RCC7AK is certified to NSF/ANSI 58 standards for the entire water filtration system.
- MINERAL BOOST – The patent-pending natural mineral AK stage delivers spring water with a balanced, healthy pH and multiple essential minerals.
- EFFECTIVE FILTRATION – Reduces TDS (93-98%), PFAS (96-99%), Chlorine (95-99%), Asbestos (>99.7%), Barium (>98.4%), Cadmium (>98.8%), Chromium (>99.2%), Copper (>97.8%), Fluoride (>97.4%), Lead (>98.9%), Selenium (>99.0%), and over 1,000 other contaminants.
- EASY INSTALLATION – The RO water system features a DIY-friendly design with quick-fitting connections, a clear manual, and step-by-step videos for a hassle-free setup.
- CONVENIENT REPLACEMENT FILTERS - Easy access to replacement filter sets: F4AK (6-Month), F9K (1-Year), F19K75 (2-Year), and F28K75 (3-Year).
$234.99
$279.00 (15% Off)
4

✖
Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

EXPRESS WATER

Express 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

EXPRESS WATER

$209.99

More Details
Main highlights
- Under Sink Water Filter: Don’t waste money on professional installation. Express Water’s quick and easy-to-understand design means you can install and understand everything about your new water filtration system
- Under Sink Water Filter System: No need to mess with refilling or activating your water filter, Express Water’s water filtration systems automatically fill your water tank with high quality drinking water
- Reverse Osmosis Water Filter: Experience what water should taste like with the Express Water reverse osmosis water filtration system filtering up to 99. 99% of Lead, Chlorine, Fluoride, PFAs/PFOs, Calcium, Arsenic, and more
- Quality : Rest easy with our 1-year on all Express Water Reverse Osmosis Water Systems. System dimensions: 17x15x5 inches, Tank dimensions: 15x12x12 inches
- Alkaline Water Filter: Express Water’s Alkaline Water Filter with Active Mineral Technology adds Calcium, Potassium, Magnesium, and other minerals to your water
$209.99
5
Best Value
21% Off

✖
Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

Waterdrop
21% Off

[Dual Flow] Waterdrop WD-T4-A Alkaline pH+ Reverse Osmosis Water Filter, NSF/ANSI 372 Certified, 10-Stage, 450GPD Tankless Undersink RO Filtration System, 2:1 Pure to Drain, BPA Free, Plug-in required

Waterdrop

$259.99

$329.99
(21% Off)

More Details
Main highlights
- 𝟒𝟓𝟎𝐆𝐏𝐃 𝐅𝐥𝐨𝐰 & 𝟐:𝟏 𝐏𝐮𝐫𝐞 𝐭𝐨 𝐃𝐫𝐚𝐢𝐧: With a 450-gallon-per-day capacity and industry-leading 2:1 water-saving ratio, the WD-T4-A provides fast, on-demand purified water while reducing wastewater by up to 800% compared to traditional RO systems.
- 𝟏𝟎-𝐒𝐭𝐚𝐠𝐞 𝐅𝐢𝐥𝐭𝐫𝐚𝐭𝐢𝐨𝐧 𝐰𝐢𝐭𝐡 𝐑𝐎 𝐌𝐞𝐦𝐛𝐫𝐚𝐧𝐞: This system reduces harmful substances, including PFOA & PFOS, chlorine, heavy metals, rust, colloids and more impurities, through its comprehensive filtration stages. The dedicated mineral-enriched line then infuses beneficial alkaline minerals, delivering healthier, great-tasting water. 𝐍𝐨𝐭𝐞: This system requires an electrical connection for operation.
- 𝐓𝐚𝐧𝐤𝐥𝐞𝐬𝐬 𝐃𝐞𝐬𝐢𝐠𝐧: The compact, tank-free system effectively avoids secondary contamination risks associated with water storage tanks, while freeing up 70% more under-sink space than traditional tank-based RO systems.
- 𝐒𝐦𝐚𝐫𝐭 𝐅𝐢𝐥𝐭𝐞𝐫 𝐋𝐢𝐟𝐞 𝐑𝐞𝐦𝐢𝐧𝐝𝐞𝐫: You won't miss a filter change with the indicator lights and buzzer alerts. Replacement intervals: CF filter: 6 months; RO membrane: 24 months; CB filter: 12 months; Alkaline mineralizer: 12 months.
- 𝐃𝐮𝐚𝐥 𝐖𝐚𝐭𝐞𝐫 𝐅𝐥𝐨𝐰: The WD-T4-A RO system offers two purified water options: a standard RO-purified stream and a mineral-enhanced alkaline stream. Switch between them effortlessly based on your needs — both deliver contaminant-reduced drinking water. Dual LED ensure complete water safety from filtration to faucet. 𝐏𝐥𝐞𝐚𝐬𝐞 𝐧𝐨𝐭𝐞: Faucet installation requires drilling holes in the countertop.
$259.99
$329.99 (21% Off)

Best water filter under sink alkalines - Holiday Sale 2025

iSpring RCC7AK-UV, NSF Certified, 7-Stage Under Sink Reverse Osmosis Water Filtration System with Alkaline Remineralization and UV Filter, Patented Top-Mounted Faucet Design for Easy Installation

Waterdrop G5P700A Alkaline Mineral pH+ Reverse Osmosis Water Filter, NSF/ANSI 372 Certified, 700G Reverse Osmosis System, 8 Stage RO Water Filtration System, 2:1 Pure to Drain, Smart LED Faucet

iSpring 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

Express 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

[Dual Flow] Waterdrop WD-T4-A Alkaline pH+ Reverse Osmosis Water Filter, NSF/ANSI 372 Certified, 10-Stage, 450GPD Tankless Undersink RO Filtration System, 2:1 Pure to Drain, BPA Free, Plug-in required

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Waterdrop TSB-ALK 8 Layer Slightly Alkaline Under Sink Water Filter System, Reduces PFAS, PFOA/PFOS, Fluoride, Chlorine, Bad Taste & Odor, with Dedicated Faucet, Under Sink Water Filtration System

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