8 Best Under Sink Water Filters of 2024

AQ-5300+_UnderSink

8 Best Under Sink Water Filters of 2024

Under sink water filters help reduce harmful contaminants in your drinking water. Typically, these systems are easily installed beneath your kitchen sink without the need for professional plumbing services. Major benefits of under-sink water filtration systems include saving space in your countertop or fridge and not having to constantly keep up with refills associated with using a pitcher. 

They’re a great option for homeowners who want convenient access to filtered water from the kitchen tap. Below you’ll find our favorite under sink water filters of 2024 so you can choose the best system for your home.

Our Top Under Sink Water Filters

  • Aquasana – Claryum® 3-Stage Max Flow – AQ-5300+ ($224.99)
  • Aquasana – Claryum® 3-Stage – AQ-5300 ($174.99)
  • Waterdrop – Undersink Water Filtration System with Dedicated Faucet – 10UB ($66.99)
  • A.O. Smith – 2 Stage Under Sink Clean Water Faucet Filter – AO-US-200 ($139.00)
  • Culligan – Change Sink Drinking Water System – US-EZ-4 ($94.19) 
  • iSpring – Classic 3-Stage Under Sink Water Filtration System – US31 ($112.42)
  • Culligan – Two-Stage Under Sink Filtration Drinking Water Filtration System – US-2 ($118.31) 
  • Premier – UF3 Under Counter Filtration – WP531130 ($189.83)

Aquasana – Claryum® 3-Stage Max Flow – AQ-5300+

Aquasana - Claryum® 3-Stage Max Flow

System cost: $224.99
Replacement cost: $79.99

System Overview

At the top of our list is Aquasana’s Claryum® 3-Stage Max Flow. This under-sink water filter has exceptional filtration capabilities, as it reduces up to 99% of 78 contaminants including lead, asbestos, VOCs, cysts, and microplastics along with 97% of chlorine and chloramines and 95% of mercury. In total, the system addresses 15x more contaminants than the leading pitcher filter and it’s been independently tested and certified by WQA to NSF/ANSI standards 42, 53, and 401.

We also like that it includes a pre-filter for trapping sediment and rust, which can extend the life of the filter. But what really makes the system stand out is the Claryum® technology. It uses a combination of filtration methods including activated carbon, catalytic carbon, ion exchange, and absolute sub-micron mechanical filtration to address a wide range of contaminants. 

This is the upgraded version of Aquasana’s Claryum® 3-Stage, and this system has a higher capacity of 800 gallons and a 44% faster flow rate of 0.72 gallons per minute (GPM) compared to the base model, making it great for large households that need a lot of filtered water quickly. The system also comes with all-metal dedicated faucets in three different finishes to choose from including brushed nickel, chrome, and oil-rubbed bronze to match your home’s aesthetic.

The only downside of this system is a slightly higher upfront cost compared to the base model Claryum® 3-Stage. If you can afford the upgraded system then we’d recommend it, but otherwise, the Aquasana Claryum® 3-Stage is still a great choice.

Pros

  • Reduces up to 99% of 78 contaminants including lead, VOCs, cysts, and microplastics
  • WQA tested and certified to NSF/ANSI Standards 42, 53, and 401
  • Features advanced Claryum® technology to remove contaminants plus a pre-filter to extend the life of the filter and increase performance
  • High flow rate of 0.72 gallons per minute 
  • 90-day satisfaction guarantee and 1-year limited warranty
  • Easy installation and eco-friendly
  • All-metal faucets in three finishes to match your home’s aesthetic

Cons

  • Higher cost than the Aquasana Claryum® 3-Stage

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Aquasana – Claryum® 3-Stage – AQ-5300

Aquasana - Claryum® 3-Stage

System cost: $174.99
Replacement cost: $69.99

System Overview

Aquasana’s Claryum® 3-Stage is the base model, which is nearly identical to the Max Flow but with a lower capacity, flow rate, and cost.

Performance wise, it also reduces up to 99% of 78 contaminants such as lead, chlorine, and microplastics through Claryum® technology with a pre-filter for sediment and rust. It includes the same features such as an electronic filter life indicator and an all-metal faucet with various finishes. 

Even though it has a lower capacity (600 gallons) and flow rate (0.5 GPM) compared to the Max Flow, it’s still a great choice for most households. It also comes at a reduced price that’s hard to beat. We’d recommend the system unless you can afford the higher-end version, or if you have a sizeable home and need the larger capacity and faster flow rate.

Pros

  • Reduces up to 99% of 78 contaminants including lead, VOCs, cysts, and microplastics
  • WQA tested and certified to NSF/ANSI Standards 42, 53, and 401
  • Features advanced Claryum® technology to remove contaminants plus a pre-filter to extend the life of the filter and increase performance
  • 90-day satisfaction guarantee and 1-year limited warranty
  • Easy installation and eco-friendly 
  • All-metal faucets in three finishes to match your home’s aesthetic

Cons

  • Lower capacity and flow rate than the Max Flow

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Waterdrop – Undersink Water Filtration System with Dedicated Faucet – 10UB

Waterdrop – Undersink Water Filtration System with Dedicated Faucet

System cost: $66.99
Replacement cost: $24.99

System Overview

The Waterdrop 10UB is budget-friendly under sink filter, with a price of $66.99 that’s the cheapest on our list. The system features a compact, space-saving design to leave you room for storage under your sink. Installations and replacements are also a breeze, with an estimated time of 3 minutes to set up the system and only 3 seconds to swap the filter. In terms of value, it also offers a remarkable capacity of 8,000 gallons (or every 12 months) and a flow rate of 0.75 GPM that is nearly unbelievable at this price point.

Despite excellent value for price in several areas, it does come with major concessions in performance. It is certified by the WQA to NSF/ANSI standards 42 and 372, but these certifications only indicate it will really help with aesthetic impurities like chlorine taste and odor while also having low lead content. As a result, the system might not be worth it for some people looking for additional protection against contaminants. Additionally, the system’s included stainless steel faucet unfortunately only comes in a single color which could be a negative to some people looking for more options to match their home’s aesthetic.

Pros

  • Low price point
  • WQA tested and certified to NSF/ANSI 42 and 372 
  • High flow rate of 0.75 gallons per minute 
  • Large capacity of 8,000 gallons or every 12 months
  • 1-year warranty
  • Fast and easy installation and replacements

Cons

  • Concessions in performance against non-aesthetic contaminants
  • Only one faucet finish option, limiting the ability to match your home’s style

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A.O. Smith – 2 Stage Under Sink Clean Water Faucet Filter – AO-US-200

A. O. Smith - 2-Stage Water Filter

System cost: $139.00
Replacement cost: $65.98

System Overview

The A.O. Smith 2-Stage water filter is on the lower end of costs and can reduce up to 99% of 78 harmful contaminants such as lead, pharmaceuticals, chlorine, and more. This under-sink filter is WQA-certified to NSF/ANSI standards 42, 43, and 401 and also uses advanced Claryum® technology.

Similar to Aquasana’s under-sink water filters, a dedicated faucet is provided which comes in one finish: brushed nickel. It can filter up to 500 gallons of water or last 6 months and has a flow rate of 0.5 GPM. The system also includes a limited 1-year warranty for defects in materials or workmanship. 

Many Amazon users enjoy the ease of installation and taste of the water it provides. Replacement filter costs are similar to other under-sink filters we’ve covered at $60 for a set or $120 for a year, with 6-month cycles.

Pros

  • Reduces up to 99% of 78 contaminants including lead, chlorine, and more
  • WQA tested and certified to NSF/ANSI Standards 42,43, and 401
  • Features advanced Claryum® technology to remove harmful contaminants
  • Easy installation, no plumber required

Cons

  • Only one faucet finish option, limiting the ability to match your home’s style

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Culligan – Change Sink Drinking Water System – US-EZ-4

Culligan - EZ-Change Under-Sink Drinking Water Filter

System cost: $94.19
Replacement cost: $70.00

System Overview

Culligan’s EZ-Change Under Sink Drinking Water Filter is relatively affordable, providing cleaner drinking water through a dedicated faucet (included with the system). The system is designed to have a simple twist-on, twist-off mechanism and built-in quick-connect fittings for an easy installation. However, we came across user reports that installation was more difficult than expected with some people requiring a plumber’s assistance. Additionally, some users reported the ⅛-inch supply line to the filter isn’t standard, and additional parts were needed to complete installation.

On the positive side, the system comes with all the certifications of other highly-recommended systems including NSF/ANSI-certification to standards 42, 53, and 401. The system is also known for providing great tasting water, with users remarking that it tastes just like bottled water.
The Culligan EZ-Change lasts up to 6 months or 500 gallons and features a flow rate of 0.5 GPM. The flow rate is good, but the 500-gallon capacity is on the low end which means it’s more suitable for smaller households. Luckily, the system features an LED indicator to tell you when it’s time to replace the filter. For more information on this system, you can check out our Culligan EZ-Change review.

Pros

  • Low price point
  • 2-year limited warranty 
  • IAPMO certified to NSF/ANSI 42 and 53 
  • LED indicator to tell you when replacements are needed

Cons

  • User reports of difficult installation sometimes requiring a plumber
  • Additional parts may be needed
  • Only one faucet finish option, limiting the ability to match your home’s style

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iSpring – Classic 3-Stage Under Sink Water Filtration System – US31

iSpring Classic 3-Stage Under Sink Water Filtration System

System cost: $112.42

Replacement cost: $29.99

System Overview

The iSpring Classic 3-Stage Under Sink Water Filtration System is a good mid-range system with three stages of filtration and plenty of certifications to back up its performance. Specifically, the system features three stages of filtration including a PP sediment filter and dual CTO carbon filter with a second layer to remove residual contaminants. By utilizing the sediment filter, the system catches dust and debris for better water quality and prolongs the life of the system by preventing those particles from damaging the interworking components. 

The system is independently certified to NSF/ANSI standards 42, 53, and 61 and tackles chlorine, chloramines, along with other contaminants to provide better water for your home. It also features a 2,000 gallon capacity and flow rate of up to 1 GPM depending on the water source pressure. Although the system touts a high capacity, it also states you’ll need to replace each of the filters every 6-12 months, judged by the water’s taste. Luckily installation and replacements are said to be easy.

One major downside of the system are reported leaks from users, as several people reported issues with cracks or leakage from the system’s fittings. Additionally, the system also shares the same issue as many other under sink filters on this list — it comes with a nice faucet, but only in a single finish which limits your ability to match your home’s style.

Pros

  • IAPMO certified to NSF/ANSI 42, 53, and 61 certified
  • High flow rate of 1 gallons per minute 
  • Large capacity of 2,000 gallons or every 6-12 months
  • 3-year warranty
  • Fast and easy installation and replacements

Cons

  • Several user reports of leaks
  • Only one faucet finish option, limiting the ability to match your home’s style

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Culligan – Two-Stage Under Sink Filtration Drinking Water Filtration System – US-2

Culligan - Two-Stage Under Sink Filtration Drinking Water Filtration System

System cost: $118.31
Replacement cost: $65.76

System Overview

Another relatively affordable kitchen water filter is the Culligan Two-Stage filter which comes with a chrome faucet and an indicator light letting you know when it’s time to replace the filter. The system features an innovative quarter-turn design for an easy installation that’s hassle and mess free. Replacements are just as easy, with quick-connect fittings and a double water-shut off so you don’t need to turn off the water supply every time you swap filter cartridges.

This system reduces a total of 5 contaminants such as lead, chlorine, and cysts and is NSF certified under standards 372, 42, 54 providing great tasting water for drinking, cooking, and ice-makers. It can filter up to 500 gallons of water at a flow rate of 0.5 GPM.

The main downside of the system is only being able to filter about half of the most common contaminants people are concerned about in their water. The Culligan Two-Stage filter doesn’t remove VOCs, pharmaceuticals, or herbicides and pesticides. Many users have also noted issues with the water filter leaking due to the short connector hose.

Pros

  • Innovative design for easy installation and hassle-free filter changes
  • IAPMO certified to NSF/ANSI 372, 42, and 54 
  • Faucet with built-in indicator light
  • 1-year warranty

Cons

  • Short hose connector is prone to leakage
  • Only one faucet finish option, limiting the ability to match your home’s style
  • Not suitable for larger households

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Watts Premier – Pure UF-3 Three-Stage Water Filtration System – WP531130

Premier - UF3 Under Counter Filtration

System cost: $189.83
Replacement cost: $96.00

System Overview

As the name of this water filter suggests, it has three stages of filtration: a pre-filter, a carbon pre-filter, and a UF membrane. These filters work synergistically to reduce 72 contaminants including sediment, chlorine taste and odor, lead, cysts, and unwanted chemicals like pesticides and herbicides. The third stage of the UF-3 uses Hollow-Fiber technology to trap and remove the tiniest particles from your drinking water down to 0.2 microns. 

The system is WQA tested and certified to NSF/ANSI standards 42 and 53, and claims to reduce harmful chemicals and odor in water by 99.8%, though we couldn’t find more specific information about what chemicals that claim applies to. However, it is not certified to address emerging contaminants like microplastics that are associated with NSF/ANSI standard 401.

The system includes a new brushed stainless steel faucet and features an easy installation process and simple replacements. The manufacturer touts backflow prevention valves intended to prevent leaks, though some users report still dealing with them. One notable downside is that the system has a low capacity of only 150 gallons, meaning this should really only be used for small homes, condos, or apartments where you’re not using a lot of filtered water despite having a good flow rate of 0.5 GPM.

Pros

  • Reduces 72 contaminants including lead, chlorine taste and odor, and pesticides and herbicides
  • WQA tested and certified to NSF/ANSI 42 and 53 
  • 30-day satisfaction guarantee and 1-year warranty 
  • Easy installation and filter replacement process

Cons

  • Not certified to address emerging contaminants
  • Only one faucet finish option, limiting the ability to match your home’s style
  • Lowest filtering capacity making it unsuitable for large households

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Choose the right under-sink water filter for your home

Now that you’ve learned what the best under-sink water filters on the market have to offer, choosing one should be a breeze. If you’re still unsure, you can learn more about under-sink water filters in general on our Under Sink Filters page. Another option to consider is an under-sink reverse osmosis filter, which removes the most contaminants by far. You can learn more about reverse osmosis filters and see our top choices in our best reverse osmosis systems list.